Imperial and U.S. customary units are still used for many everyday measures in the U.S. and UK. All of the factors here are exact definitions except the rounded display.
How to use the Imperial to Metric Converter
- Inches
- Feet
- Miles
- Pounds
- Ounces
- US gallons
- Fahrenheit
Results update as you type, and every field accepts the units shown in its menu.
How it works
Each input is converted independently, so fill in only what you need.
Inputs explained
| Field | What to enter |
|---|---|
| Inches | A number |
| Feet | A number |
| Miles | A number |
| Pounds | A number |
| Ounces | A number |
| US gallons | A number |
| Fahrenheit | A number |
What each result means
- Inches in centimetres = [Inches] × 2.54
- Feet in metres = [Feet] × 0.3048
- Miles in kilometres = [Miles] × 1.609344
- Pounds in kilograms = [Pounds] × 0.45359237
- Ounces in grams = [Ounces] × 28.349523125
- Gallons in litres = [US gallons] × 3.785411784
- Fahrenheit in Celsius = ([Fahrenheit] – 32) × 5 ÷ 9
Example values
How the main result changes when Inches changes and everything else stays at the example values above:
| Inches | Pounds in kilograms (kg) |
|---|---|
| 6 | 68.039 |
| 9 | 68.039 |
| 12 | 68.039 |
| 15 | 68.039 |
| 18 | 68.039 |
| 24 | 68.039 |
Formula
cm = in × 2.54; m = ft × 0.3048; km = mi × 1.609344kg = lb × 0.45359237; g = oz × 28.3495; L = US gal × 3.78541; °C = (°F − 32) × 5/9Worked example
Inputs — Inches: 12; Feet: 6; Miles: 10; Pounds: 150; Ounces: 8; US gallons: 5; Fahrenheit: 98.6.
Results — Inches in centimetres = 30.48 cm; Feet in metres = 1.8288 m; Miles in kilometres = 16.093 km; Pounds in kilograms = 68.039 kg; Ounces in grams = 226.8 g; Gallons in litres = 18.927 L; Fahrenheit in Celsius = 37 °C.
Frequently asked questions
Is the UK still imperial?
Officially metric, but miles, pints and stones remain in everyday use.
Are U.S. and UK gallons the same?
No: the UK gallon is 4.546 L, the U.S. gallon 3.785 L.
What formula does the Imperial to Metric Converter use?
cm = in × 2.54; m = ft × 0.3048; km = mi × 1.609344.