Stone to Pounds Calculator (st → lbs)
Convert a body weight in stones — or stones and extra pounds — to total pounds, kilograms and ounces in one step.
st
lb
1 stone = 14 lbs exactly
- 1
Conversion factor
14 lb / stone1 stone = 14 lb exactly (international definition). - 2
Total pounds
11 × 14 = 154
How does this calculator work?
Multiply stones by 14 to get pounds (1 stone = 14 lb exactly). For the "st + lb" format, total lb = (st × 14) + extra_lb. Multiply total pounds by 0.45359237 for kilograms or by 16 for ounces. No rounding — all conversions are exact.
Formula
How this is calculated
The stone is an imperial unit of mass equal to exactly 14 avoirdupois pounds. This definition is exact and permanent — it was codified by the Weights and Measures Act 1835 in the UK. To convert stones to pounds, multiply by 14 and add any remaining pounds: for example, 11 stone 7 lb = (11 × 14) + 7 = 154 + 7 = 161 lb.
To continue converting to kilograms, multiply total pounds by 0.45359237 (the exact, internationally defined kg-per-pound ratio from the 1959 agreement). To reach ounces, multiply total pounds by 16 (one avoirdupois pound = 16 ounces).
The stone remains widely used for body weight in everyday conversation in the United Kingdom and Ireland. UK pharmacy scales, some fitness apps and older medical records display weight in stones and pounds, making this conversion essential when entering data into metric-only systems or comparing figures with international databases.
Frequently asked questions
One stone is exactly 14 pounds. This is an exact definition — not a rounded approximation — and applies equally to the avoirdupois pound used in the US, UK and many other countries.
12 stone × 14 = 168 pounds. For 12 st 6 lb, add the extra pounds: 168 + 6 = 174 lb.
1 stone = 14 lb, and 1 lb = 16 oz, so 1 stone = 14 × 16 = 224 ounces.
Also known as
TG we-Calculate Editorial Team. (2026). Stone to Pounds Calculator (st → lbs) [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/stone-to-lbs-calculator
TG we-Calculate Editorial Team. "Stone to Pounds Calculator (st → lbs)." TG we-Calculate. 2026. https://we-calculate.com/calculator/stone-to-lbs-calculator.
TG we-Calculate Editorial Team, "Stone to Pounds Calculator (st → lbs)," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/stone-to-lbs-calculator
@misc{wecalculate_stone_to_lbs_calculator, title = {Stone to Pounds Calculator (st → lbs)}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/stone-to-lbs-calculator}}, year = {2026}, note = {TG we-Calculate} }
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