177 live tools
Daily Utilities
Calories, hydration, text, dates, math, and daily planning.
Daily math, text, fitness, and science tools: calories, dates, converters, and planning calculators. Health numbers are planning estimates, not medical advice. Generators never send your input to a server.
Utility expansion 11 Dec 2026
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BMI (Body Mass Index) Calculator
BMI (Body Mass Index). Browser-side only.
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Sleep Cycle Bedtime/Wake Calculator
Sleep Cycle Bedtime/Wake. Browser-side only.
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Nap Timer Calculator
Nap Timer. Browser-side only.
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Jet Lag Adjustment Calculator
Jet Lag Adjustment. Browser-side only.
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Caffeine Half-Life Calculator
Caffeine Half-Life. Browser-side only.
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Utility expansion 18 Dec 2026
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Blood Alcohol Content (BAC) Estimator
Blood Alcohol Content (BAC). Browser-side only.
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Standard Drink Calculator
Standard Drink. Browser-side only.
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Calories Burned by Activity (MET) Calculator
Calories Burned by Activity (MET). Browser-side only.
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Steps-to-Calories/Miles Converter
Steps-to-Calories/Miles. Browser-side only.
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Stair Climbing Calorie Calculator
Stair Climbing Calorie. Browser-side only.
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Swimming Pace Calculator
Swimming Pace. Browser-side only.
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Rowing Split Time Calculator
Rowing Split Time. Browser-side only.
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VO2 Max Estimator
VO2 Max. Browser-side only.
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Resting Heart Rate Zone Finder
Resting Heart Rate Zone Finder. Browser-side only.
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Blood Pressure Category Checker
Blood Pressure Category. Browser-side only.
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Waist-to-Hip Ratio Calculator
Waist-to-Hip Ratio. Browser-side only.
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Waist-to-Height Ratio Calculator
Waist-to-Height Ratio. Browser-side only.
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Dog Age to Human Years Calculator
Dog Age to Human Years. Browser-side only.
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Cat Age to Human Years Calculator
Cat Age to Human Years. Browser-side only.
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Dog Food Portion Calculator
Dog Food Portion. Browser-side only.
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Paint Coverage Calculator (Sqft per Gallon)
Paint Coverage Calculator (Sqft per Gallon). Browser-side only.
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Wallpaper Roll Calculator
Wallpaper Roll. Browser-side only.
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Flooring Tile Quantity Calculator
Flooring Tile Quantity. Browser-side only.
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Carpet Cost Calculator
Carpet Cost. Browser-side only.
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Concrete Volume (Cubic Yard) Calculator
Concrete Volume (Cubic Yard). Browser-side only.
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Utility expansion 25 Dec 2026
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Mulch & Soil Volume Calculator
Mulch & Soil Volume. Browser-side only.
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Gravel Quantity Calculator
Gravel Quantity. Browser-side only.
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Lawn Fertilizer Coverage Calculator
Lawn Fertilizer Coverage. Browser-side only.
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Grass Seed Coverage Calculator
Grass Seed Coverage. Browser-side only.
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Pool Volume & Chemical Calculator
Pool Volume & Chemical. Browser-side only.
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Pool Heating Cost Estimator
Pool Heating Cost. Browser-side only.
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HVAC BTU Sizing Calculator
HVAC BTU Sizing. Browser-side only.
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Insulation R-Value Calculator
Insulation R-Value. Browser-side only.
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Room Square Footage Calculator
Room Square Footage. Browser-side only.
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Moving Box Count Estimator
Moving Box Count. Browser-side only.
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Recipe Ingredient Scaler
Recipe Ingredient Scaler. Browser-side only.
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Baking Pan Size Conversion Calculator
Baking Pan Size Conversion. Browser-side only.
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Oven Temperature Converter (F/C/Gas Mark)
Oven Temperature Converter (F/C/Gas Mark). Browser-side only.
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Cooking Measurement Converter (Cups/Tbsp/mL)
Cooking Measurement Converter (Cups/Tbsp/mL). Browser-side only.
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Ingredient Substitution Ratio Calculator
Ingredient Substitution Ratio. Browser-side only.
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Coffee-to-Water Ratio Calculator
Coffee-to-Water Ratio. Browser-side only.
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Cocktail Dilution & ABV Calculator
Cocktail Dilution & ABV. Browser-side only.
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Multi-City Meeting Time Scheduler
Multi-City Meeting Time Scheduler. Browser-side only.
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Flight Duration Calculator
Flight Duration. Browser-side only.
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Layover Time Sufficiency Checker
Layover Time Sufficiency. Browser-side only.
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Utility expansion 1 Jan 2027
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Road Trip Fuel Stop Planner
Road Trip Fuel Stop Planner. Browser-side only.
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Packing List Generator by Trip Length
Packing List Generator by Trip Length. Browser-side only.
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Luggage Weight Limit Checker
Luggage Weight Limit. Browser-side only.
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Currency Exchange Margin Calculator
Currency Exchange Margin. Browser-side only.
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Passport Photo Size Checker
Passport Photo Size. Browser-side only.
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GPA Calculator
GPA. Browser-side only.
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Weighted Grade Calculator
Weighted Grade. Browser-side only.
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Test Score Curve Calculator
Test Score Curve. Browser-side only.
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Letter Grade to Percentage Converter
Letter Grade to Percentage. Browser-side only.
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Class Attendance Percentage Calculator
Class Attendance Percentage. Browser-side only.
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Spaced Repetition Interval Calculator
Spaced Repetition Interval. Browser-side only.
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Typing Speed (WPM) Test Tool
Typing Speed (WPM) Test. Browser-side only.
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Roman Numeral Converter
Roman Numeral. Browser-side only.
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General Number Base Converter (Base 2-64)
General Number Base Converter (Base 2-64). Browser-side only.
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Prime Number Checker
Prime Number. Browser-side only.
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Factorial Calculator
Factorial. Browser-side only.
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Fibonacci Sequence Generator
Fibonacci Sequence. Browser-side only.
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Number to Words Converter
Number to Words. Browser-side only.
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Words to Number Converter
Words to Number. Browser-side only.
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Ordinal Number Converter
Ordinal Number. Browser-side only.
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Utility expansion 8 Jan 2027
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Time to Decimal Hours Converter
Time to Decimal Hours. Browser-side only.
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Angle Unit Converter (Degrees/Radians/Gradians)
Angle Unit Converter (Degrees/Radians/Gradians). Browser-side only.
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Slope/Gradient Percentage Calculator
Slope/Gradient Percentage. Browser-side only.
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Area Unit Converter (Acres/Hectares/Sqft)
Area Unit Converter (Acres/Hectares/Sqft). Browser-side only.
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Volume Unit Converter (Liters/Gallons)
Volume Unit Converter (Liters/Gallons). Browser-side only.
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Weight/Mass Unit Converter (kg/lb/oz/stone)
Weight/Mass Unit Converter (kg/lb/oz/stone). Browser-side only.
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General Length/Distance Unit Converter
General Length/Distance Unit. Browser-side only.
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Speed Unit Converter (mph/kmh/knots/mach)
Speed Unit Converter (mph/kmh/knots/mach). Browser-side only.
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Meat Doneness Temperature Guide
Meat Doneness Temperature. Browser-side only.
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Shoe Size Converter (US/UK/EU)
Shoe Size Converter (US/UK/EU). Browser-side only.
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Clothing Size Converter (US/UK/EU)
Clothing Size Converter (US/UK/EU). Browser-side only.
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Ring Size Converter
Ring Size. Browser-side only.
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Paper Size Converter (A4/Letter/Legal)
Paper Size Converter (A4/Letter/Legal). Browser-side only.
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Diagonal Screen Size Calculator
Diagonal Screen Size. Browser-side only.
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TV Size Viewing Distance Calculator
TV Size Viewing Distance. Browser-side only.
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WiFi Signal Strength (dBm) to Percentage Converter
WiFi Signal Strength (dBm) to Percentage. Browser-side only.
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General Data Storage Unit Converter (Bits/Bytes/GB/TB)
General Data Storage Unit Converter (Bits/Bytes/GB/TB). Browser-side only.
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Password Strength Entropy Calculator
Password Strength Entropy. Browser-side only.
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Diceware Passphrase Generator
Diceware Passphrase. Browser-side only.
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Backup Code Formatter (2FA)
Backup Code Formatter (2FA). Browser-side only.
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Utility expansion 15 Jan 2027
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Fuel Efficiency (MPG to L/100km) Converter
Fuel Efficiency (MPG to L/100km). Browser-side only.
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Cooking Yield/Shrinkage Calculator
Cooking Yield/Shrinkage. Browser-side only.
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Party/Event Headcount Food Calculator
Party/Event Headcount Food. Browser-side only.
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Birthday/Zodiac Sign Calculator
Birthday/Zodiac Sign. Browser-side only.
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Chinese Zodiac Year Calculator
Chinese Zodiac Year. Browser-side only.
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Retirement Countdown Calculator
Retirement Countdown. Browser-side only.
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Life Expectancy Estimator (Actuarial-Style)
Life Expectancy Estimator (Actuarial-Style). Browser-side only.
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Screen Time Daily Average Calculator
Screen Time Daily Average. Browser-side only.
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Commute Time & Cost Calculator
Commute Time & Cost. Browser-side only.
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Carbon Footprint (Travel) Estimator
Carbon Footprint (Travel). Browser-side only.
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Water Bottle Refill Savings Calculator
Water Bottle Refill Savings. Browser-side only.
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Recycling Symbol Lookup Guide
Recycling Symbol Lookup. Browser-side only.
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Utility expansion 19 Feb 2027
QR error correction tables
Text utilities
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Online Word & Character Counter
Counts plus estimated reading time.
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Case Converter
UPPERCASE, lowercase, and Title Case.
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Duplicate Line Remover
Unique lines, original order kept.
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Lorem Ipsum Text Generator
Words, sentences, and paragraphs.
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Password Generator
Custom length and special symbols.
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Flesch-Kincaid Readability & Grade Level Analyzer
Flesch reading ease and grade level from sentence, word, and vowel-group syllable counts.
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Text Case Inverter & Title Case Converter
Invert per-character case, force title case, or alternate letter case on a block of text.
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Slugify / URL String Cleaner Tool
Turn a phrase into a lowercase hyphenated URL slug and strip leftover punctuation.
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Alphabetical Text / Line Sorter (Ascending / Descending)
Sort non-empty lines A to Z or Z to A with a locale-aware compare.
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Line Break / Newline Remover & Joiner
Join wrapped lines into one string with a space or a comma-space separator.
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Word Frequency Counter & Density Inspector
Top tokens of three or more letters with counts and percent density in the passage.
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Character Count without Spaces Calculator
Count characters with spaces, characters without whitespace, and words in one pass.
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Text Difference / Merge Checker Tool
Unique lines in A, unique lines in B, and the common lines shared by both lists.
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Binary to Text & ASCII Converter
Convert space-separated 8-bit bytes to text, or text to binary bytes.
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Hex to Text / ASCII Converter
Convert a hex string to ASCII text, or text to space-separated hex bytes.
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Morse Code Translator (Text to Morse & Morse to Text)
Translate A-Z and 0-9 to ITU Morse, or Morse dots and dashes back to text.
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ROT13 & Cipher Generator
Rotate A-Z letters by a chosen shift (13 by default). Digits and punctuation stay put.
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NATO Phonetic Alphabet Translator
Spell letters and digits as Alpha, Bravo, Charlie through Zulu and Zero through Nine.
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Gasoline / Fuel Cost & Trip Distance Calculator
Gallons and fuel cost from miles, miles per gallon, and price per gallon.
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Generators & randomizers
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QR Code Generator
Static QR codes in the browser.
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Random List / Name Picker & Spinner
Pick one trimmed line at random using crypto.getRandomValues.
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Random Number Generator with Range & Exclusion Rules
Draw unique integers between min and max while skipping a comma-separated exclude list.
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Coin Flip Simulator & Head/Tail Frequency Counter
Simulate n fair flips and report heads, tails, and each side as a percent.
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Everyday utilities
Date, time & productivity
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Date Difference Calculator
Days between two dates.
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Time Zone Converter
Convert times across city offsets.
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Reading Time & Speaking Speed Calculator
Word count plus read and speak minutes from a passage and two words-per-minute speeds.
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Daily Countdown Timer & Event Counter
Days and hours from Date.now() until a target calendar date (local midnight).
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Working Days & Business Days Calculator (Excludes Holidays)
Count Monday through Friday between two dates, minus optional YYYY-MM-DD holidays.
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Leap Year & Century Calculator
Say whether a year is a Gregorian leap year, which century it sits in, and the next leap year.
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Time Duration & Hours Worked Timesheet Calculator
Hours worked from start HH:MM, end HH:MM, and unpaid break minutes. Overnight shifts wrap.
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Time Adder / Subtractor (Hours, Minutes, Seconds)
Add or subtract two hour-minute-second spans and return the normalized total.
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Military Time (24-Hour) Converter
Convert a 12-hour hour and minute plus AM/PM into 24-hour time, or the reverse.
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World Clock & Time Offset Difference Visualizer
Show two clocks from Date.now() plus minute offsets from UTC, and the gap between them.
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Pomodoro Timer & Custom Interval Planner
Total focus minutes from work, break, and rounds, plus an estimated end clock from now.
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Habit Tracker Streak Calculator
Active streak if last done is today or yesterday, plus weekly target pace from Date.now().
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Electric Vehicle (EV) Charging Time & Cost Estimator
Charge hours and wall-energy cost from kWh needed, charger kW, price, and efficiency.
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Pregnancy Due Date Calculator (Naegele's Rule)
Due date as LMP plus 280 days, plus gestational weeks from Date.now().
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Speed, Distance & Time Interconvertible Calculator
Fill any two of speed, distance, and time (0 means unknown) and solve the third.
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Math & statistics
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Percentage Calculator
X% of Y, or percent increase/decrease.
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Dice Roller & Probability Distribution Simulator
Roll n dice with a chosen face count, show faces and total, plus the theoretical mean.
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Tip Calculator with Split & Custom Percentage
Tip amount, bill plus tip, and per-person share from bill, tip percent, and headcount.
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Scientific Notation / Exponential Notation Converter
Split a number into coefficient and exponent, or rebuild the number from coeff times 10^exp.
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Standard Deviation & Variance Calculator
Mean, sample variance, and sample standard deviation from a comma or space list of numbers.
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Z-Score & Normal Distribution Calculator
Z-score (x-mean)/sd and an approximate left-tail percentile via an erf expansion.
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Margin of Error & Sample Size Calculator
Margin of error from z, p, and n, or the sample size that hits a target margin of error.
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Probability & Combinations / Permutations Calculator
nCr or nPr for integer n and r using an iterative product (no full factorial).
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Matrix Addition, Subtraction & Multiplication Calculator
Add, subtract, or multiply two 2x2 matrices and print the four result entries.
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Quadratic Equation Solver & Graphing Helper
Discriminant and roots for ax^2+bx+c. Complex roots print as text when the discriminant is negative.
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Pythagorean Theorem & Triangle Solver
Fill any two of a, b, and hypotenuse c (0 means unknown) and compute the missing side.
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Circle Area, Perimeter, and Arc Length Calculator
Area, circumference, and arc length from radius and a central angle in degrees.
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3D Volume Calculator (Sphere, Cylinder, Cone, Prism)
Volume for a sphere, cylinder, cone, or rectangular prism from radius, height, length, and width.
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Force, Mass & Acceleration (F=ma) Newton Calculator
Fill any two of force, mass, and acceleration (0 means unknown) using F = m a.
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Percentage Increase / Decrease / Difference Calculator
Increase percent from A to B, decrease percent from A to B, and symmetric percent difference.
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Ratio & Fraction Simplifier Calculator
Greatest-common-divisor simplified A:B ratio plus the decimal value of A/B.
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Greatest Common Divisor (GCD) & Least Common Multiple (LCM) Calculator
Euclidean GCD and LCM = |A x B| / GCD for two integers.
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Significant Figures (Sig Figs) Rounding Calculator
Round a number to n significant figures and show the matching scientific notation.
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Health & fitness
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BMR and TDEE Calculator
Mifflin-St Jeor BMR, TDEE, 20% loss and 15% surplus calorie targets.
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Macro Nutrient Calculator
Protein, carb, and fat grams from calories, with a fat-loss protein check.
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Daily Water Intake Calculator
Daily water from weight, exercise minutes, and climate, in oz, liters, or cups.
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Whitespace / Extra Space Cleaner
Collapse runs of spaces and tabs to one space and trim the edges of the text.
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Pace Calculator for Running & Cycling (Min/Mile or Min/KM)
Pace per unit and speed from distance, elapsed minutes, and mile or kilometer units.
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Target Heart Rate Zone Calculator (Karvonen Method)
Karvonen target HR from age, resting heart rate, and intensity percent of heart-rate reserve.
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One Rep Max (1RM) Bench / Squat / Deadlift Calculator
Epley one-rep max from the weight you lifted and the reps you completed.
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Body Fat Percentage Estimator (US Navy Method)
US Navy tape estimate from sex, height, waist, neck, and hip (women) in inches.
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Ideal Body Weight (IBW) Calculator (Devine / Miller Formulas)
Devine and Miller ideal body weight in kilograms and pounds from sex and height in inches.
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Lean Body Mass (LBM) Calculator
Lean mass from scale weight and a body-fat percent: weight x (1 - body fat).
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Ovulation & Fertile Window Estimator
Ovulation near cycle length minus 14 days from LMP, with a window from 5 days before through the day after.
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Household & travel
Science & engineering
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Kinetic & Potential Energy Calculator
Kinetic energy 1/2 m v^2 and gravitational potential m g h with g defaulting to 9.81.
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Ohm's Law Calculator (Voltage, Current, Resistance, Power)
Fill any two of V, I, and R (0 means unknown), then compute the third plus P = V I.
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Resistor Color Code Band Reader & Calculator
Read a 4-band resistor: two digits, multiplier, and tolerance, then ohms and percent tolerance.
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Capacitor Value & Code Converter
Decode a 3-digit capacitor code such as 104 into picofarads, nanofarads, and microfarads.
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Sound Decibel & Distance Attenuation Calculator
Inverse-square level at a second distance: dB2 = dB1 - 20 log10(d2/d1).
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Torque & Power Conversion Calculator (HP to kW)
Shaft power from rpm and newton-meters, or convert horsepower to kilowatts.
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Pressure Unit Converter (PSI, Bar, Pascal, Atm)
Convert a pressure value among PSI, bar, pascal, and standard atmospheres.
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Temperature Unit Converter (Celsius, Fahrenheit, Kelvin)
Convert a temperature among Celsius, Fahrenheit, and Kelvin.
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Energy Unit Converter (Joules, Calories, kWh, BTU)
Convert an energy value among joules, thermochemical calories, kilowatt-hours, and BTU.
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