Stone to Pounds Converter (st, lb, kg)

One stone is exactly 14 pounds, or 6.35 kg. To convert stone to pounds, multiply by 14 and add any extra pounds: 11 st 4 lb is 158 lb (71.7 kg). To go back, divide pounds by 14 — the whole number is stones, the remainder pounds.

Convert weight between stones and pounds, pounds and kilograms in any direction. Enter weight the British way (e.g. 11 st 4 lb) or as a single number in lb or kg.

How to use this calculator

1. Choose what you have: stones and pounds, pounds only, or kilograms.
2. For stones and pounds, enter each part separately (for 11 st 4 lb, type 11 and 4).
3. Read the headline result, then the same weight in kilograms, pounds and decimal stone underneath.
4. Copy the share link to keep the conversion, for example to send a weight to a doctor's office that uses a different unit.

How it's calculated

The stone and pound are defined in Schedule 1 of the UK Weights and Measures Act 1985 and in NIST Handbook 44: 1 stone = 14 lb, and 1 lb = 0.45359237 kg exactly. So:

• pounds = stones × 14 + extra pounds
• kg = pounds × 0.45359237
• stones = floor(pounds ÷ 14), remaining lb = pounds − stones × 14
• decimal stone = pounds ÷ 14 (11.5 st means 11 st 7 lb, not 11 st 5 lb)

The calculator rounds pounds to one decimal before splitting into stones, so a value like 209.96 lb shows as 15 st 0 lb rather than 14 st 14 lb.

Worked examples

1. 11 st 4 lb to pounds and kg

11 × 14 = 154, plus 4 = 158 lb. 158 × 0.45359237 = 71.67 kg.

2. 85 kg to stones and pounds

85 ÷ 0.45359237 = 187.39 lb. 187.39 ÷ 14 = 13.385, so 13 whole stones (182 lb) with 5.4 lb left: 13 st 5.4 lb.

3. 200 lb to stone

200 ÷ 14 = 14.286. 14 stones is 196 lb, leaving 4 lb: 14 st 4 lb, or 90.7 kg.

Stone to pounds and kg chart

Half-stone steps in kg

Every half stone is 7 lb. Use this table when one record is in stones and another in kilograms.

Kilograms to stone: how to convert kilos to stones and pounds

To change kilos into stones, divide the kilograms by 6.35029 (the kilograms in one stone). The whole number is stones; multiply the decimal part by 14 to get the pounds left over. 70 kg ÷ 6.35029 = 11.023 st, and 0.023 × 14 ≈ 0.3 lb, so 70 kg = 11 st 0.3 lb. Choose "Kilograms (kg)" in the converter to do this in one step.

1 stone in kg

1 stone = 6.35029 kg, exactly 14 × 0.45359237. Rounded, a stone is 6.35 kg; two stone is 12.7 kg and half a stone is 3.18 kg.

Kg to stone and pounds chart: 40 to 200 kg

Every whole kilogram from 40 to 200, rounded to one decimal of a pound. Use it as a kg to stone and lbs converter when you only need a quick look-up.

Stone converted to pounds: 1 to 30 stone

Pounds to stone chart

Converting weight loss or gain

Weight changes convert the same way as weights. Losing 1 stone is losing 14 lb, or 6.35 kg. Losing 5 kg is 11.02 lb, a little under a stone. Losing half a stone is 7 lb (3.18 kg). If you log progress in one unit and your clinic or app uses another, convert the start and end weights and subtract, rather than converting a rounded difference.

The rest of the British weight table

The stone belongs to the British avoirdupois table that NIST reproduces in Handbook 44, Appendix C. Above the stone come larger units you may meet in older records:

• Quarter: 2 stones = 28 lb (12.7 kg).
• Hundredweight (cwt): 4 quarters = 112 lb (50.8 kg), or 8 stone.
• Ton: 20 hundredweight = 2,240 lb (1,016 kg), or 160 stone. This long ton is heavier than the 2,000 lb US ton.

Using stone for body weight and BMI

BMI is always worked out in metric: weight in kilograms divided by height in metres squared, as the CDC defines it. If you weigh yourself in stones, convert to kg first. For example, 12 stone is 76.2 kg; at 1.75 m tall that is a BMI of 24.9.

The CDC classes an adult BMI of 18.5 to less than 25 as a healthy weight, 25 to less than 30 as overweight and 30 or more as obesity. The NHS uses the same 25 and 30 cut-offs for most adults, but lower ones — 23 for overweight and 27.5 for obese — for people from South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean backgrounds.

BMI is a screening number, not a diagnosis. For advice about your own weight, speak to your GP or doctor. If you're tracking a goal, the weight loss date calculator estimates when you'll reach it, and the body recomposition calculator helps if you're losing fat and gaining muscle at the same time.

Pounds to stones and pounds, step by step

Converting lbs to stones and pounds is a division with a remainder, the same as turning minutes into hours and minutes. Take 187 lb:

1. Divide by 14: 187 ÷ 14 = 13.357.
2. The whole number is the stones: 13 st.
3. Multiply the stones back: 13 × 14 = 182 lb.
4. Subtract to get the pounds left over: 187 − 182 = 5 lb. So 187 lb is 13 st 5 lb.

The same steps work for a single pound. 1 lb is 1 ÷ 14 = 0.0714 stone, which in stones and pounds is simply 0 st 1 lb. Weights under 14 lb never reach a whole stone, so they stay in pounds. If you have a decimal weight such as 187.6 lb, keep the decimal on the pounds part: 13 st 5.6 lb.

Decimal stone to stones and pounds

Some scales and apps show weight as decimal stone, like 11.6 st. The digits after the point are tenths of a stone, not pounds, and a tenth of a stone is 1.4 lb. Multiply the decimal part by 14 to get the pounds: 0.6 × 14 = 8.4, so 11.6 st is 11 st 8.4 lb. Use this table to read any decimal:

Going the other way, divide the leftover pounds by 14: 11 st 3 lb is 11 + 3 ÷ 14 = 11.21 st.

Pounds and ounces

A pound splits into 16 ounces (NIST Handbook 44, Appendix C), so the calculator also shows the weight as pounds and ounces, rounded to the nearest ounce. Multiply the decimal part of the pounds by 16: 158.5 lb is 158 lb 8 oz, and a kilogram weight of 3.4 kg is 7.496 lb, or 7 lb 8 oz. Ounces are the right unit for small weights; for adult body weight, one decimal place of a pound is already finer than most bathroom scales read.

Healthy weight in stone for your height

Because BMI is weight divided by height squared, you can turn the CDC's healthy BMI range of 18.5 to less than 25 into a weight range for each height: weight (kg) = BMI × height (m)². Heights are converted with 1 inch = 2.54 cm exactly (NIST). The table shows the adult range in stones and pounds. Add your height in the calculator to get the range, your own BMI and a chart of where your weight sits.

The upper figure is where the overweight category begins, so a healthy weight is anything from the first column up to just under the second. These ranges apply to adults aged 20 and over. The CDC uses age- and sex-specific BMI percentiles for children and teens aged 2 to 19, so this table does not apply to them. If the NHS's lower thresholds apply to you, the overweight line starts at BMI 23 rather than 25.

Giving your weight in another country

If you are used to stones and need to fill in a US form, give pounds: multiply stones by 14 and add the extra pounds. For a form, clinic or airline that works in metric, give kilograms, which is pounds × 0.45359237. Going the other way, a US weight in pounds divides by 14 to give stones, and a European weight in kilograms divides by 6.35 to give decimal stone, which the calculator splits into stones and pounds for you. One decimal place in kilograms or pounds is enough for body weight.

Common mistakes

• Reading decimal stone as stones and pounds. 12.5 stone is 12 st 7 lb, not 12 st 5 lb, because a stone has 14 pounds, not 10.
• Rounding the kg factor too far. The exact factor is 6.35029 kg per stone. Rounding to 6.3 or 6.4 is off by 0.6 kg at 12 stone, and the error grows with weight.
• Forgetting the extra pounds. 11 st 4 lb is not 11 × 14; add the 4 lb.
• Confusing the hundredweight. In the British table a hundredweight is 112 lb (8 stone). The US hundredweight is 100 lb.

Frequently asked questions

Sources & method

• UK Weights and Measures Act 1985 — 1 stone = 14 lb; 1 lb = 0.45359237 kg
• NIST Handbook 44 (2026), Appendix C — 14 pounds = 1 stone; 2 stones = 1 quarter; 1 lb = 0.453 592 37 kg
• CDC — Adult BMI categories and formula
• NHS — Obesity: BMI thresholds, including lower thresholds for some ethnic groups

Results are estimates for general information. Found an error? It helps everyone — see our methodology.