Kilograms to Stone Converter

The result comes out in decimal stone, but people say their weight as stones and pounds. Convert the leftover decimal by multiplying it by 14:

Watch the top of the range. If the leftover rounds to 14 lb, it's really another whole stone: 13.6 lb rounds up to 14, which you'd write as the next stone and 0 lb, never as "14 st 14 lb".

The most reliable mental route goes through pounds. Multiply the kilograms by 2.2, then divide by 14 and keep the remainder. For 80 kg: 80 × 2.2 = 176 lb, and 176 ÷ 14 is 12 with 8 left, so 12 st 8 lb. That matches the converter.

Dividing straight by a rounded number is riskier:

• ÷ 6.35 is almost exact: 80 kg gives 12.598 st.
• ÷ 6.5 is 2.3% low: 12.31 st, about 4 lb light at 80 kg.
• ÷ 6 is 5.8% high: 13.33 st, over 10 lb heavy at 80 kg.

The × 2.2 step is itself about 0.2% low, but at body weights that's well under a pound, so the remainder rarely changes.

If you weigh yourself in kilograms but think of goals in stone, convert the change, not just each reading. A 5 kg loss is 0.78737 st, or 11.02 lb, so just under 11 lb.

Going the other way, a scale that steps in tenths of a stone moves 1.4 lb, or 0.635 kg, per step. Small daily ups and downs in kilograms may not show up on it at all.

For a target, convert it once and write it down in both units, so you're not reconverting every week and picking up a different rounding each time.