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Selected tools
132 tools shownACoS Calculator
Find the share of attributed sales spent on Amazon advertising.
JSON Formatter
Format and validate JSON with two-space indentation.
Listing Byte Counter
Check UTF-8 bytes and characters before uploading listing text.
Word Counter
Count words, characters and lines in pasted text.
Restock Planner
Estimate coverage and reorder timing from your daily sales.
Tile Quantity Calculator
Estimate tiles required for an area, including a waste allowance.
Percentage Calculator
Find a percentage of any number.
ROAS Calculator
Calculate revenue returned for each unit of advertising spend.
Reading Time Calculator
Estimate reading duration using your own reading pace.
CTR Calculator
Measure the percentage of impressions that resulted in clicks.
Base64 Encoder
Encode UTF-8 text into Base64.
Attendance Percentage Calculator
Calculate attendance percentage from classes attended and held.
Business Days Calculator
Add business days to a date or estimate when a business-day range ends, excluding weekends.
Twitter / X Character Counter
Count characters, words and remaining characters for a post on X (Twitter).
Instagram Character Counter
Count characters and words for Instagram captions and bios.
Hair Growth Calculator
Estimate hair length gained over time using an adjustable monthly growth rate.
Projectile Motion Calculator
Estimate flight time, maximum height and horizontal range from launch speed and angle.
K/D Ratio Calculator
Calculate kill/death ratio and optionally KDA for games.
Semitone Calculator
Calculate the semitone distance and frequency ratio between two frequencies.
Fantasy Football Points Calculator
Estimate fantasy football points with common PPR scoring inputs.
Caffeine Half-Life Calculator
Estimate caffeine remaining over time using an adjustable half-life.
Time Multiplication Calculator
Multiply a duration in hours and minutes by any factor.
MPG to L/100km Converter
Convert US miles per gallon to liters per 100 kilometers and back.
Butter Converter
Convert butter between cups, sticks, ounces and grams for cooking.
Coordinate Plane Maker
Plot an x,y point on a simple coordinate plane directly in your browser.
Days Until Calculator
Count calendar days from today to any future date.
Force Calculator
Calculate force from mass and acceleration using F = m × a.
Sourdough Ratio Calculator
Calculate starter, flour and water amounts from a feeding ratio.
Cold Brew Ratio Calculator
Calculate coffee and water amounts for a chosen cold-brew ratio.
GPA to Percentage Converter
Estimate a percentage from GPA using a selectable scale and simple linear conversion.
Percentage Variance Calculator
Calculate percentage variance between an actual and reference value.
3-Phase Wattage Calculator
Estimate three-phase electrical power from voltage, current and power factor.
BPM Tapper
Tap along with music to estimate beats per minute in your browser.
Days in a Year Calculator
Check total days, leap-year status and weekday counts for any year.
Birthday Countdown
Find how many days remain until the next occurrence of a birthday.
Raised Bed Soil Calculator
Estimate cubic feet and cubic yards of soil needed for a raised garden bed.
Resistance Calculator
Calculate electrical resistance from voltage and current using Ohm’s law.
Probability Calculator
Calculate probability from favorable outcomes and total possible outcomes.
Percentage Increase Calculator
Calculate percentage increase or decrease between an old and new value.
Study Hours Estimator
Estimate total study time and a daily study target from your workload.
Number Line Maker
Place a value on a configurable number line and see its relative position.
Yeast Conversion Calculator
Convert common baking yeast measurements between teaspoons and grams.
Square Root Calculator
Calculate square roots and perfect-square checks instantly.
Music Note Frequency Calculator
Convert a MIDI note number to its equal-tempered frequency in hertz.
Music Interval Calculator
Convert a semitone distance into a common musical interval name.
Passive Voice Checker
Scan text for common passive-voice patterns and highlight likely matches.
kWh Cost Calculator
Estimate electricity usage and running cost from watts, usage time and your energy rate.
Vegetable Garden Size Calculator
Estimate garden area from household size and your preferred growing-space allowance.
Quiz Score Calculator
Convert correct answers and total questions into a score percentage.
Acceleration Calculator
Calculate average acceleration from change in velocity and elapsed time.
Rainfall Converter
Convert rainfall depth between millimeters and inches.
Phone Charging Time Calculator
Estimate charging time from battery capacity, charger current and efficiency.
Espresso Ratio Calculator
Calculate espresso beverage mass from coffee dose and brew ratio.
Cricket Run Rate Calculator
Calculate cricket run rate from runs scored and overs faced.
Mulch Calculator
Estimate cubic feet and cubic yards of mulch required from area and depth.
Momentum Calculator
Calculate linear momentum from mass and velocity.
Text Sorter
Sort lines alphabetically, reverse them, or remove blank lines in your browser.
Paint Calculator
Estimate paint quantity from wall area, coverage and number of coats.
Word Frequency Counter
Count repeated words and view the most frequent terms in pasted text.
Mouse Sensitivity Converter
Keep the same effective sensitivity when changing mouse DPI.
Click Speed Test
Measure clicks per second with a simple browser-based clicking test.
Dew Point Calculator
Estimate dew point from air temperature and relative humidity.
Baby Age Calculator
Calculate age from a birth date in years, months and days.
Egg Substitution Calculator
Scale common egg substitutes for baking based on the number of eggs in a recipe.
Flooring Calculator
Estimate flooring area to purchase after adding a configurable waste allowance.
Engagement Rate Calculator
Calculate engagement rate from interactions and audience size or impressions.
CPM Calculator
Calculate advertising cost per thousand impressions.
CPV Calculator
Calculate advertising cost per view.
Playlist Duration Calculator
Estimate total playlist duration from track count and average track length.
Exam Time Calculator
Divide an exam duration across questions to estimate time per question.
Half-Life Calculator
Calculate the remaining quantity after a given number of half-lives or elapsed time.
Quadratic Equation Solver
Solve ax² + bx + c = 0 and report real or complex roots.
Exponent Calculator
Calculate a base raised to any exponent.
Logic Gate Simulator
Evaluate AND, OR, XOR, NAND and NOR gates from two binary inputs.
Grocery List Quantity Calculator
Scale ingredient or grocery quantities for a different number of servings.
Coffee Ratio Calculator
Calculate water required from coffee dose and your preferred brew ratio.
Reading Time Estimator
Estimate reading time from word count and a custom words-per-minute pace.
Blood Alcohol Calculator
Estimate blood alcohol concentration from drinks, weight and time elapsed.
Pay Raise Calculator
Calculate your new salary or hourly rate after a percentage raise.
Hourly to Salary Calculator
Convert an hourly wage to an annual salary or monthly pay.
Stock Profit Calculator
Calculate profit or loss from a stock trade including shares, buy and sell prices.
FPS Calculator
Calculate frames per second from frame count and elapsed time.
Signature Analyzer
Explore what common signature traits might reveal about personality.
Am I Attractive Quiz
Answer fun questions to get a playful attractiveness score.
Puppy Size Predictor
Estimate your puppy adult weight from current weight, age and breed size.
Bug Bite Identifier
Identify common bug bites by their appearance and symptoms.
Nutrition Label Generator
Create a FDA-style nutrition facts label from your recipe ingredients.
Steam Account Value Calculator
Estimate the total value of your Steam game library.
I-Bond Calculator
Estimate the current value and interest of Series I savings bonds.
Military Weight Standards Calculator
Check if you meet US military height and weight requirements.
Military Leave Calculator
Calculate accumulated leave days and sell-back value.
Scroll Speed Test
Measure your mouse scroll wheel speed in scrolls per second.
Metre to Foot
Convert metres to feet instantly.
Foot to Metre
Convert feet to metres instantly.
Kilogram to Pound
Convert kilograms to pounds.
Pound to Kilogram
Convert pounds to kilograms.
Celsius to Fahrenheit
Convert Celsius to Fahrenheit.
Fahrenheit to Celsius
Convert Fahrenheit to Celsius.
Kilometre to Mile
Convert kilometres to miles.
Mile to Kilometre
Convert miles to kilometres.
Litre to Gallon
Convert litres to US gallons.
Gallon to Litre
Convert US gallons to litres.
Inch to Centimetre
Convert inches to centimetres.
Centimetre to Inch
Convert centimetres to inches.
Square Foot to Square Metre
Convert square feet to square metres.
Square Metre to Square Foot
Convert square metres to square feet.
MPH to KM/H
Convert miles per hour to kilometres per hour.
KM/H to MPH
Convert kilometres per hour to miles per hour.
Ounce to Gram
Convert ounces to grams.
Gram to Ounce
Convert grams to ounces.
Stone to Kilogram
Convert stones to kilograms.
Millimetre to Inch
Convert millimetres to inches.
Inch to Millimetre
Convert inches to millimetres.
Yard to Metre
Convert yards to metres.
Metre to Yard
Convert metres to yards.
Kilowatt to Horsepower
Convert kilowatts to horsepower.
Horsepower to Kilowatt
Convert horsepower to kilowatts.
Calorie to Kilojoule
Convert calories to kilojoules.
Kilojoule to Calorie
Convert kilojoules to calories.
Megabyte to Gigabyte
Convert megabytes to gigabytes.
Gigabyte to Megabyte
Convert gigabytes to megabytes.
PSI to Bar
Convert PSI to bar.
Bar to PSI
Convert bar to PSI.
Acre to Hectare
Convert acres to hectares.
Hectare to Acre
Convert hectares to acres.
Newton to Pound-force
Convert newtons to pound-force.
Joule to Calorie
Convert joules to calories.
Watt to BTU
Convert watts to BTU per hour.
Pascal to Atmosphere
Convert pascals to atmospheres.
Electronvolt to Volt
Convert electronvolts to volts.
Byte to Bit
Convert bytes to bits.
Bit to Byte
Convert bits to bytes.
Explore the full directory
The catalog contains 13,530 directional conversion tools across 55+ measurement families, plus 98 standalone utilities. Conversion pairs share calculation engines. No finance, loan or investment tools.