120 calculators, converters and utility tools in one clear directory.
120 tools
Convert between metric and imperial length units.
Convert mass and weight measurements.
Convert Celsius, Fahrenheit and kelvin.
Calculate percentages and percentage changes.
Calculate age between two dates.
Handle everyday arithmetic quickly.
Convert common world currencies.
Convert bytes, KB, MB, GB and TB.
Simplify and evaluate common algebraic expressions.
Convert degrees, radians and turns.
Calculate area for common shapes.
Convert common metric and customary area units.
Find the arithmetic mean of a number set.
Estimate transfer time and throughput.
Convert numbers between bases 2 and 36.
Convert values to and from binary.
Calculate body mass index from height and weight.
Estimate basal metabolic rate.
Estimate body fat percentage.
Count working days between dates.
Estimate daily calorie requirements.
Change text between common letter cases.
Count characters with or without spaces.
Convert colors between HEX, RGB, HSL and related formats.
Project compound growth and contributions.
Estimate concrete volume and materials.
Convert common cooking measurements.
Calculate time remaining to a date.
Estimate payoff time, payments and credit card interest.
Build and explain common cron schedule expressions.
Calculate electrical current from voltage and resistance.
Find the duration between two dates.
Add or subtract days from a date.
Build a practical payoff schedule for multiple debts.
Convert decimal values between number bases.
Calculate density, mass or volume.
Convert mass per volume units.
Calculate sale price and savings.
Remove repeated lines from text.
Calculate work and energy relationships.
Convert joules, calories, kWh and BTU.
Solve common equations step by step.
Convert digital file size units.
Estimate flooring material requirements.
Calculate force from mass and acceleration.
Convert common force measurements.
Add, subtract, multiply and divide fractions.
Convert hertz and common frequency units.
Convert MPG and liters per 100 kilometers.
Calculate common shape measurements.
Calculate measurements for common plane and solid shapes.
Calculate grade point average.
Calculate course grades and required scores.
Generate common cryptographic hashes from text.
Estimate target heart-rate training zones.
Convert values to and from hexadecimal.
Encode or decode HTML entities.
Estimate a reference weight range.
Reduce image file size while preserving useful visual quality.
Convert images between common file formats.
Resize image dimensions for web, social and document use.
Compare purchasing power over time.
Calculate simple interest over time.
Project investment value and returns.
Format and inspect JSON data.
Check JSON syntax and structure.
Estimate loan payments and total interest.
Estimate daily protein, carbohydrate and fat targets.
Estimate monthly mortgage payments.
Calculate voltage, current, resistance and power.
Calculate running pace, time and distance.
Estimate paint required for a surface.
Generate strong random passwords locally.
Estimate take-home pay from gross earnings and deductions.
Reduce PDF file size for easier storage and sharing.
Convert supported documents and images to or from PDF.
Calculate power from work and time.
Convert watts, kilowatts and horsepower.
Estimate pregnancy dates and milestones.
Calculate pressure from force and area.
Convert common pressure measurements.
Calculate simple event probabilities.
Generate a random number within a range.
Estimate reading and speaking time from word count.
Test regular expressions against sample text.
Calculate electrical resistance from voltage and current.
Estimate long-term retirement savings.
Calculate return on investment.
Estimate roof area and materials.
Convert annual salary into monthly, weekly and hourly pay.
Project savings contributions and growth.
Evaluate common scientific expressions.
Plan sleep and wake times around complete sleep cycles.
Create clean URL slugs from text.
Convert road, scientific and nautical speeds.
Divide a bill between people.
Estimate stair rise, run, steps and stringer dimensions.
Calculate common descriptive statistics.
Estimate tax from a rate and amount.
Estimate total daily energy expenditure.
Remove unwanted spaces, line breaks and formatting.
Compare two text blocks and identify differences.
Sort lines alphabetically or numerically.
Estimate tile quantity and coverage.
Add and subtract time durations.
Convert seconds, minutes, hours and days.
Compare times across global time zones.
Convert Unix timestamps and dates.
Calculate a tip and total bill.
Calculate torque from force and distance.
Convert common torque measurements.
Compare cost per unit between products.
Encode or decode URL components.
Generate standards-compatible unique identifiers locally.
Calculate electrical voltage from current and resistance.
Calculate volume for common solids.
Convert liters, gallons, cups and fluid ounces.
Estimate daily water requirements.
Calculate electrical power from voltage and current.
Count words, characters and lines.
Everyday and technical measurement converters.
Simple tools for common numerical problems.
Plan borrowing, saving and investment decisions.
Practical personal health and body measurements.
Calculate dates, durations and time intervals.
Reference tools for science and engineering work.
Formatting, encoding and number-system utilities.
Fast helpers for writing and text processing.
Quick helpers for common daily tasks.
Practical file, image and PDF utilities.