Conversion factors used
| From | To | Factor |
|---|---|---|
| 1 pound (lb) | kilograms | 0.45359237 kg (exact) |
| 1 stone (st) | pounds | 14 lb |
| 1 inch (in) | centimeters | 2.54 cm (exact) |
| 1 foot (ft) | centimeters | 30.48 cm (exact) |
| 1 US fluid ounce | milliliters | 29.5735 ml |
| 1 US cup | milliliters | 236.588 ml |
| 1 kilocalorie (kcal) | kilojoules | 4.184 kJ |
| 1 mile | kilometers | 1.609344 km (exact) |
Calories, kcal and kJ
The “Calories” on most food labels are actually kilocalories (kcal). In many countries labels also show kilojoules (kJ): multiply kcal by 4.184 to get kJ, or divide kJ by 4.184 to get kcal.
kJ = kcal × 4.184
kcal = kJ ÷ 4.184
Converting height and weight
- Height in feet and inches → cm: (feet × 12 + inches) × 2.54.
- Weight in pounds → kg: pounds × 0.4536.
- Stone and pounds → kg: (stone × 14 + pounds) × 0.4536.
Frequently asked questions
How many pounds are in a kilogram?
One kilogram is about 2.2046 pounds. One pound is exactly 0.45359237 kilograms.
How do I convert my height from feet to centimeters?
Multiply your total height in inches by 2.54. For example, 5 ft 7 in is 67 inches, which is about 170 cm.
Are Calories and kcal the same?
Yes. The Calorie (capital C) on food labels is the same as a kilocalorie (kcal). One kcal equals 4.184 kilojoules.
Methods and sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units (conversion factors)
Content reviewed: by the FitNumbra editorial team.