Free · Unit conversions
Avoirdupois Pounds & Stone Mass Converter
Convert pounds to stones and back using fourteen avoirdupois pounds per stone.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
154 avoirdupois pounds equals 11 stones. One stone is exactly 14 pounds, and one international avoirdupois pound is exactly 0.45359237 kg.
Stones = pounds ÷ 14; pounds = stones × 14
Worked example
Enter these known values and leave the other values blank.
- Mass in avoirdupois pounds
- 154 lb
- Mass in stones
- 11 st
Assumptions and limitations
- This is a mass conversion. It does not convert pounds-force, pressure or torque.
- Use nonnegative masses. Decimal stones are fractions of a fourteen-pound stone; 11.5 stones means 11 stones 7 pounds.
Common questions
How many pounds are in half a stone?
Half of fourteen pounds is seven pounds.
Are these troy pounds?
No. The pound is the international avoirdupois unit commonly used for everyday mass, rather than the troy system used for some precious metals.
References
The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.
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