Free Unit Converters & Calculators

Square Meter to Square Foot Converter

1 m² = 10.76391 ft² — two-way converter with formula and table.

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Acre to Hectare Converter

1 ac = 0.404686 ha — convert instantly with formula and table.

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Acre to Square Meter Converter

1 ac = 4,046.856422 m² — convert instantly with formula and table.

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Acre to Square Foot Converter

1 ac = 43,560 ft² — convert instantly with formula and table.

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Hectare to Square Foot Converter

1 ha = 107,639.104167 ft² — convert instantly with formula and table.

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Square Meter to Hectare Converter

1 m² = 0.0001 ha — convert instantly with formula and table.

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Acre to Square Kilometer Converter

1 ac = 0.004047 km² — convert instantly with formula and table.

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Hectare to Square Kilometer Converter

1 ha = 0.01 km² — convert instantly with formula and table.

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Square Kilometer to Hectare Converter

1 km² = 100 ha — convert instantly with formula and table.

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Hectare to Square Meter Converter

1 ha = 10,000 m² — convert instantly with formula and table.

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Square Meter to Square Kilometer Converter

1 m² = 0.000001 km² — convert instantly with formula and table.

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Square Kilometer to Acre Converter

1 km² = 247.105381 ac — convert instantly with formula and table.

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Gigabyte to Byte Converter

1 GB = 1,073,741,824 B — convert instantly with formula and table.

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Gigabyte to Megabyte Converter

1 GB = 1,024 MB — convert instantly with formula and table.

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Kilobyte to Byte Converter

1 KB = 1,024 B — convert instantly with formula and table.

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Byte to Gigabyte Converter

1 B = 0 GB — convert instantly with formula and table.

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Megabyte to Byte Converter

1 MB = 1,048,576 B — convert instantly with formula and table.

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Terabyte to Gigabyte Converter

1 TB = 1,024 GB — convert instantly with formula and table.

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Kilobyte to Megabyte Converter

1 KB = 0.000977 MB — convert instantly with formula and table.

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Byte to Terabyte Converter

1 B = 0 TB — convert instantly with formula and table.

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Gigabyte to Terabyte Converter

1 GB = 0.000977 TB — convert instantly with formula and table.

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Byte to Kilobyte Converter

1 B = 0.000977 KB — convert instantly with formula and table.

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Byte to Megabyte Converter

1 B = 0.000001 MB — convert instantly with formula and table.

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Megabyte to Gigabyte Converter

1 MB = 0.000977 GB — convert instantly with formula and table.

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JSON Formatter & Validator

Validate JSON, see the exact error position, and pretty-print or minify it — entirely in your browser.

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Unit Converter

Convert length, weight, temperature, volume, area, speed and data — as you type.

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Age Calculator

Find your exact age in years, months, days — and count down to your next birthday.

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Simple Interest Calculator

Interest earned or owed with I = P × r × t, plus the total balance.

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Salary to Hourly Converter

Convert an annual salary to hourly, weekly, bi-weekly and monthly pay using your real hours.

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Discount Calculator

Sale price after a percentage discount, how much you save, and the price with tax.

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Compound Interest Calculator

Compound interest with monthly contributions, any compounding frequency, and a year-by-year breakdown.

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Ideal Body Weight Calculator

Devine, Robinson, Miller and Hamwi ideal-weight formulas side by side, plus the healthy BMI range.

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BMR Calculator

Basal metabolic rate with the Mifflin-St Jeor equation, plus daily calorie needs by activity level.

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Calorie Deficit Calculator

Maintenance calories (TDEE) and a daily target for a chosen deficit, with expected weekly loss.

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Water Intake Calculator

A rule-of-thumb daily water estimate from body weight, exercise and climate — with the caveats.

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BMI Calculator

Check your Body Mass Index instantly with WHO classification, ideal weight range, and BMI Prime.

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Meter to Millimeter Converter

1 m = 1,000 mm — convert instantly with formula and table.

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Millimeter to Centimeter Converter

1 mm = 0.1 cm — convert instantly with formula and table.

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Millimeter to Meter Converter

1 mm = 0.001 m — convert instantly with formula and table.

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Kilometer to Meter Converter

Instant Kilometer to Meter Converter. Convert km to m with exact SI formulas, 50-row reference table, and live calculations.

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Meter to Foot Converter

1 m = 3.28084 ft — two-way converter with formula and table.

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Meter to Inch Converter

1 m = 39.370079 in — convert instantly with formula and table.

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Centimeter to Millimeter Converter

1 cm = 10 mm — convert instantly with formula and table.

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Mile to Kilometer Converter

1 mi = 1.609344 km — two-way converter with formula and table.

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Inch to Foot Converter

1 in = 0.083333 ft — convert instantly with formula and table.

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Kilometer to Mile Converter

1 km = 0.621371 mi — convert instantly with formula and table.

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Millimeter to Foot Converter

1 mm = 0.003281 ft — convert instantly with formula and table.

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Meter to Yard Converter

1 m = 1.093613 yd — convert instantly with formula and table.

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Basic Calculator

Fast, simple 4-function basic online calculator. Free addition, subtraction, multiplication, division & percentages with keyboard shortcuts.

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Percentage Change Calculator

Percentage increase or decrease between two numbers — with the formula shown.

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Percentage Calculator

What is X% of Y? Percentage change, increase, decrease — all in one tool.

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PSI to Bar Converter

1 psi = 0.068948 bar — two-way converter with formula and table.

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Atmosphere to Bar Converter

1 atm = 1.01325 bar — two-way converter with formula and table.

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Torr to Pascal Converter

1 Torr = 133.322368 Pa — two-way converter with formula and table.

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Pascal to Atmosphere Converter

1 Pa = 0.00001 atm — convert instantly with formula and table.

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Bar to Pascal Converter

1 bar = 100,000 Pa — two-way converter with formula and table.

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Pascal to Bar Converter

1 Pa = 0.00001 bar — convert instantly with formula and table.

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Kilopascal to Atmosphere Converter

1 kPa = 0.009869 atm — convert instantly with formula and table.

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Atmosphere to Pascal Converter

Instantly convert atmospheres (atm) to Pascals (Pa). Learn formulas, 2.5 atm to Pa conversions, and reference tables.

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Atmosphere to Kilopascal Converter

1 atm = 101.325 kPa — convert instantly with formula and table.

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Pascal to Kilopascal Converter

1 Pa = 0.001 kPa — convert instantly with formula and table.

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Bar to Kilopascal Converter

1 bar = 100 kPa — convert instantly with formula and table.

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Bar to Atmosphere Converter

1 bar = 0.986923 atm — convert instantly with formula and table.

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Meter per Second to Kilometer per Hour Converter

1 m/s = 3.6 km/h — convert instantly with formula and table.

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Kilometer per Hour to Knot Converter

1 km/h = 0.539957 kn — convert instantly with formula and table.

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Meter per Second to Knot Converter

1 m/s = 1.943844 kn — convert instantly with formula and table.

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Mile per Hour to Knot Converter

1 mph = 0.868976 kn — convert instantly with formula and table.

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Foot per Second to Knot Converter

1 ft/s = 0.592484 kn — convert instantly with formula and table.

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Foot per Second to Meter per Second Converter

1 ft/s = 0.3048 m/s — convert instantly with formula and table.

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Mile per Hour to Meter per Second Converter

1 mph = 0.44704 m/s — convert instantly with formula and table.

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Knot to Foot per Second Converter

1 kn = 1.68781 ft/s — convert instantly with formula and table.

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Knot to Kilometer per Hour Converter

1 kn = 1.852 km/h — convert instantly with formula and table.

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Knot to Mile per Hour Converter

1 kn = 1.150779 mph — convert instantly with formula and table.

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Knot to Meter per Second Converter

1 kn = 0.514444 m/s — convert instantly with formula and table.

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Kilometer per Hour to Foot per Second Converter

1 km/h = 0.911344 ft/s — convert instantly with formula and table.

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Fahrenheit to Celsius Converter

Convert degrees Fahrenheit to degrees Celsius instantly — with formula, examples and table.

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Fahrenheit to Kelvin Converter

Convert degrees Fahrenheit to kelvins instantly — with formula, examples and table.

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Kelvin to Celsius Converter

Convert kelvins to degrees Celsius instantly — with formula, examples and table.

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Celsius to Fahrenheit Converter

Convert degrees Celsius to degrees Fahrenheit instantly — with formula, examples and table.

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Kelvin to Fahrenheit Converter

Convert kelvins to degrees Fahrenheit instantly — with formula, examples and table.

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Celsius to Kelvin Converter

Convert degrees Celsius to kelvins instantly — with formula, examples and table.

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Hour to Second Converter

1 hr = 3,600 s — convert instantly with formula and table.

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Minute to Hour Converter

1 min = 0.016667 hr — convert instantly with formula and table.

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Week to Day Converter

1 wk = 7 d — convert instantly with formula and table.

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Day to Year (average) Converter

1 d = 0.002738 yr — convert instantly with formula and table.

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Minute to Second Converter

1 min = 60 s — convert instantly with formula and table.

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Second to Hour Converter

1 s = 0.000278 hr — convert instantly with formula and table.

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Day to Hour Converter

1 d = 24 hr — convert instantly with formula and table.

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Hour to Day Converter

1 hr = 0.041667 d — convert instantly with formula and table.

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Day to Month (average) Converter

1 d = 0.032854 mo — convert instantly with formula and table.

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Second to Day Converter

1 s = 0.000012 d — convert instantly with formula and table.

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Second to Minute Converter

1 s = 0.016667 min — convert instantly with formula and table.

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Hour to Minute Converter

1 hr = 60 min — convert instantly with formula and table.

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Liter to US Fluid Ounce Converter

1 L = 33.814023 fl oz — convert instantly with formula and table.

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Milliliter to US Tablespoon Converter

1 ml = 0.067628 tbsp — convert instantly with formula and table.

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Liter to US Gallon Converter

1 L = 0.264172 gal — convert instantly with formula and table.

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US Fluid Ounce to Liter Converter

1 fl oz = 0.029574 L — convert instantly with formula and table.

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US Gallon to Liter Converter

1 gal = 3.785412 L — convert instantly with formula and table.

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US Fluid Ounce to US Teaspoon Converter

1 fl oz = 6 tsp — convert instantly with formula and table.

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Milliliter to US Cup Converter

1 ml = 0.004227 cup — convert instantly with formula and table.

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US Fluid Ounce to US Cup Converter

1 fl oz = 0.125 cup — convert instantly with formula and table.

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Milliliter to US Teaspoon Converter

1 ml = 0.202884 tsp — convert instantly with formula and table.

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US Gallon to US Fluid Ounce Converter

1 gal = 128 fl oz — convert instantly with formula and table.

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Milliliter to US Pint Converter

1 ml = 0.002113 pt — convert instantly with formula and table.

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US Gallon to UK Gallon Converter

1 gal = 0.832674 gal (UK) — convert instantly with formula and table.

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Kilogram to Stone Converter

1 kg = 0.157473 st — convert instantly with formula and table.

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Pound to Kilogram Converter

1 lb = 0.453592 kg — convert instantly with formula and table.

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Kilogram to Pound Converter

1 kg = 2.204623 lb — two-way converter with formula and table.

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Gram to Ounce Converter

1 g = 0.035274 oz — two-way converter with formula and table.

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Gram to Kilogram Converter

1 g = 0.001 kg — convert instantly with formula and table.

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Pound to Gram Converter

1 lb = 453.59237 g — convert instantly with formula and table.

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Ounce to Gram Converter

1 oz = 28.349523 g — convert instantly with formula and table.

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Metric Ton to Kilogram Converter

1 t = 1,000 kg — convert instantly with formula and table.

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Kilogram to Gram Converter

1 kg = 1,000 g — convert instantly with formula and table.

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Stone to Kilogram Converter

1 st = 6.350293 kg — convert instantly with formula and table.

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Gram to Milligram Converter

1 g = 1,000 mg — convert instantly with formula and table.

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Milligram to Gram Converter

1 mg = 0.001 g — convert instantly with formula and table.

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Character Counter

Live character, word, sentence and line counts — with limits for tweets, SMS, meta descriptions and titles.

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Word Counter

Count words, characters, sentences and paragraphs — with reading time.

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Case Converter

UPPERCASE, lowercase, Title Case, Sentence case, camelCase and more — one click.

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