UK weight-loss calculator
lbs to stone converter
Convert pounds into stone and pounds. Type into either box to convert in both directions.
Updated
lb = st lb
Displayed values are rounded for readability, but the arithmetic uses the full precision of the internationally defined factors, a pound is exactly 0.45359237 kg and a stone is exactly 14 pounds, so converting back and forth will not drift.
Pounds to Stone and pounds
11 st 0.3 lb
154.3 lb converts to the figure on the left, exactly. Nothing in it is an approximation.
About pounds and stone and pounds
A stone is exactly 14 pounds, so this conversion needs no rounding at all, divide by 14, and whatever is left over is your pounds.
For example, 170 pounds is 12 stone with 2 pounds left over: 12 × 14 = 168, and 170 − 168 = 2. So 170 lb is 12 st 2 lb.
The conversion
stone = pounds ÷ 14 (the remainder is the pounds)The table below is generated from the same conversion used by the tool above, so the two always agree.
| Pounds | Stone and pounds |
|---|---|
| 100 lb | 7 st 2 lb |
| 110 lb | 7 st 12 lb |
| 120 lb | 8 st 8 lb |
| 130 lb | 9 st 4 lb |
| 140 lb | 10 st 0 lb |
| 150 lb | 10 st 10 lb |
| 160 lb | 11 st 6 lb |
| 170 lb | 12 st 2 lb |
| 180 lb | 12 st 12 lb |
| 190 lb | 13 st 8 lb |
| 200 lb | 14 st 4 lb |
| 210 lb | 15 st 0 lb |
| 220 lb | 15 st 10 lb |
| 230 lb | 16 st 6 lb |
| 240 lb | 17 st 2 lb |
| 250 lb | 17 st 12 lb |
| 260 lb | 18 st 8 lb |
| 270 lb | 19 st 4 lb |
| 280 lb | 20 st 0 lb |
| 290 lb | 20 st 10 lb |
| 300 lb | 21 st 6 lb |
A note on rounding
Conversions are shown rounded for readability, weights to a tenth of a unit, heights to the nearest inch or centimetre. The underlying arithmetic uses the full precision of the internationally defined factors, so repeatedly converting back and forth will not drift.
Bathroom scales themselves are usually accurate to within a few hundred grams at best, and body weight varies by a kilogram or more across a single day. That variation is far larger than any rounding here.
Related calculators
Frequently asked questions
How many pounds are in a stone?
Exactly 14. Unlike most weight conversions, this one involves no approximation.
Important information
The calculators on this site provide general information and estimates. They are not medical advice and they do not diagnose any condition.
Everyone is different, and individual energy needs vary for reasons these equations cannot capture. If you have a health condition, take medication, are pregnant or breastfeeding, or have any concerns about your weight, speak to your GP, pharmacist or a registered dietitian.