How to use the unit calculator
- Select a category: Length, Weight, Temperature, Area, Volume, Speed, Time or Data.
- Type the number you want to convert in the Value box.
- Choose the unit you are converting from, then the unit you want to.
- Read the result. Use the swap button to reverse the units, or copy the result with one click.
The table below the calculator also shows your value in every other unit of that category, so you can compare in one glance.
Unit conversion formulas and quick reference
Every result is based on exact, internationally agreed definitions. These are the most common conversions people look for.
Length
| From | To | Multiply by |
|---|---|---|
| 1 inch | centimeters | 2.54 (exact) |
| 1 foot | meters | 0.3048 (exact) |
| 1 yard | meters | 0.9144 (exact) |
| 1 mile | kilometers | 1.609344 (exact) |
| 1 kilometer | miles | 0.621371 |
Weight
| From | To | Multiply by |
|---|---|---|
| 1 pound | kilograms | 0.45359237 (exact) |
| 1 kilogram | pounds | 2.20462 |
| 1 ounce | grams | 28.3495 |
| 1 quintal | kilograms | 100 |
| 1 tonne | kilograms | 1,000 |
Need your weight in kilograms and height in centimeters for health calculations? Try our Age and BMI Calculator.
Temperature
| Conversion | Formula | Example |
|---|---|---|
| Celsius to Fahrenheit | °F = °C × 9/5 + 32 | 37 °C = 98.6 °F |
| Fahrenheit to Celsius | °C = (°F − 32) × 5/9 | 212 °F = 100 °C |
| Celsius to Kelvin | K = °C + 273.15 | 0 °C = 273.15 K |
Area, volume and speed
| Conversion | Value |
|---|---|
| 1 acre | 43,560 sq ft = 4,046.86 m² = 0.4047 hectare |
| 1 hectare | 10,000 m² = 2.471 acres |
| 1 liter | 1,000 mL = 0.001 m³ |
| 1 US gallon | 3.785 liters |
| 1 km/h | 0.27778 m/s |
| 1 mph | 1.609344 km/h |
| 1 knot | 1.852 km/h |
KB vs KiB: decimal and binary data units
A kilobyte (KB) is 1,000 bytes, while a kibibyte (KiB) is 1,024 bytes. Storage makers usually use the decimal units, while operating systems often count in binary units. That is why a drive sold as 500 GB can show up as about 465 GiB on your computer. This calculator lists both, following the NIST guide to binary prefixes.
A note on the bigha
The bigha is not a fixed unit across India. This calculator uses 3,025 square yards (about 2,529.29 m²), a value commonly used in Uttar Pradesh. For property deals or legal documents, confirm the local value with your state revenue records.
How accurate are these conversions?
- Exact definitions. Inches, feet, yards, miles and pounds use their legal metric definitions, listed in NIST Special Publication 811.
- SI standard. Metric units follow the International System of Units maintained by the BIPM.
- Display rounding only. Calculations run at full precision. Rounding is applied only to what you see, and you control the decimal places.
- Private by design. Everything runs in your browser. The numbers you type are not sent to our servers. See our privacy policy.
Found a wrong value or want a unit added? Contact us and we will check it against the sources above. For safety-critical, medical or legal work, always verify with an official source.
Frequently asked questions
More free tools from RankForge
Browse all tools on the RankForge home page, read tips on the RankForge blog, or learn who builds these tools.