Unit Converter — Length, Weight, Temp & More Online Free
Free online unit converter supporting length, weight, temperature, volume, area, speed, time, pressure, energy, and more measurement categories. Convert between metric and imperial units instantly.
Length
Formula
1 m = 3.280839895 ftQuick Reference
All Length Conversions
pm1,000,000,000,000nm1000000000µm1000000mm1000cm100dm10m1km0.001in39.37007874ft3.280839895yd1.093613298mi0.00062137119nmi0.0005399568ly1.056971e-16AU6.684492e-12Click any row to set it as the "To" unit
How to Use Unit Converter
Select a Category
Choose a measurement category such as Length, Weight, Temperature, Volume, Area, Speed, Time, Pressure, or Energy.
Pick From and To Units
Select the unit you want to convert from and the unit you want to convert to.
Enter Your Value
Type the measurement value in the input field. The converted result updates instantly.
View the Formula
See the conversion formula used to calculate the result, helpful for learning how units relate.
Frequently Asked Questions
The converter supports Length, Weight, Temperature, Volume, Area, Speed, Time, Pressure, Energy, Power, Force, and Data Storage. More categories can be added over time.
All conversions use standard international conversion factors with high-precision decimal arithmetic, ensuring results are accurate to at least 10 decimal places for most conversions.
Yes, every supported category includes both metric and imperial units. For example, you can convert kilometers to miles, kilograms to pounds, or Celsius to Fahrenheit.
Temperature conversions use the exact mathematical formulas: Celsius to Fahrenheit (°C × 9/5 + 32), Fahrenheit to Celsius ((°F − 32) × 5/9), and Kelvin conversions using the standard offset.
Yes, the conversion formula is displayed alongside the result. It shows the mathematical relationship between the two units, including any conversion factors and constants.
The unit list is regularly updated. If you need a specific unit that isn't listed, please provide feedback so it can be added in a future update.
Try an Example
Value
100
From cm → in · 100 cm = 39.37 in
Formula: value ÷ 2.54
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