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Conversion factors
| From | To | Multiply by |
|---|---|---|
| Inches | Centimeters | 2.54 |
| Feet | Inches | 12 |
| Centimeters | Meters | 0.01 |
| Pounds | Kilograms | 0.45359237 |
| Kilograms | Pounds | 2.20462 |
| Stones | Pounds | 14 |
| Stones | Kilograms | 6.35029 |
Mixed units: an example
Say you know your height as 5 ft 7 in but your scale shows 68 kg:
- Convert the height: 5 × 12 + 7 = 67 in, and 67 × 2.54 = 170.2 cm = 1.702 m.
- Use the metric formula: 68 ÷ (1.702 × 1.702) = 68 ÷ 2.897 = 23.5.
Or convert the weight instead: 68 kg × 2.20462 = 149.9 lb, then 703 × 149.9 ÷ 67² = 23.5. Same answer.
Quick height reference
| Feet and inches | Inches | Centimeters |
|---|---|---|
| 5 ft 0 in | 60 | 152.4 |
| 5 ft 3 in | 63 | 160.0 |
| 5 ft 6 in | 66 | 167.6 |
| 5 ft 9 in | 69 | 175.3 |
| 6 ft 0 in | 72 | 182.9 |
| 6 ft 3 in | 75 | 190.5 |
Frequently asked questions
How do I convert 5'7" to centimeters?
5 × 12 + 7 = 67 inches, and 67 × 2.54 = 170.18 cm.
Is it better to calculate BMI in metric or imperial?
Neither. Both give the same BMI. Use the units you measured in to avoid rounding errors. The metric formula · the imperial formula.
Sources
Kept up to dateLast updated October 9, 2026
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This page is for education and is not medical advice. Talk with a healthcare professional about your weight and health.
