📏 Unit Converters
14 free tools — no signup, no paid tier
Length Converter
cm, mm, inches, feet, meters and more.
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Weight Converter
kg, lbs, oz, grams and more.
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Temperature Converter
Celsius, Fahrenheit, Kelvin instantly.
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Speed Converter
km/h, mph, m/s, knots, Mach — instant conversion.
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Area Converter
m², ft², acres, hectares — all area units.
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Volume Converter
liters, gallons, ml, fl oz, cups.
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Data Size Converter
KB, MB, GB, TB, PB — digital storage units.
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Time Converter
Seconds, minutes, hours, days, weeks.
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Energy Converter
Joules, calories, kWh, BTU.
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Pressure Converter
PSI, bar, pascal, atm, mmHg.
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Frequency Converter
Hz, kHz, MHz, GHz.
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Angle Converter
Degrees, radians, gradians.
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Illuminance Converter
Lux, foot-candle, lumen.
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Roman Numeral Converter
Convert numbers to Roman numerals and back.
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Common Conversions
Direct pages for specific unit pairs — each shows the formula, worked examples and a quick reference table.
Length
- Centimeters to Inches
- Inches to Centimeters
- Feet to Meters
- Meters to Feet
- Kilometers to Miles
- Miles to Kilometers
- Millimeters to Inches
- Inches to Millimeters
- Meters to Yards
- Yards to Meters
- Feet to Inches
- Inches to Feet
Weight
- Kilograms to Pounds
- Pounds to Kilograms
- Grams to Ounces
- Ounces to Grams
- Stone to Pounds
- Pounds to Stone
- Kilograms to Grams
- Grams to Kilograms