Convert Stone (US) to Pound
Convert stones (us) to pounds instantly. 1 stone (us) = 12.5 pound — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pound to Stone (US) converter for the reverse conversion.
Units explained
Stone (US)
A less common US definition of the stone, about 5.67 kilograms.
A variant stone weight used in some historical US trade.
Rare; appears mainly in historical or specialized contexts.
Derived from older English stone weights that varied by commodity.
Pound
The pound (lb) is a unit of mass equal to exactly 0.45359237 kilogram.
From Latin 'libra pondo' (a pound by weight); the symbol lb comes from 'libra'.
The primary weight unit in the United States and informally in the UK.
The international avoirdupois pound was fixed in the 1959 yard-and-pound agreement.
Stone (US) to Pound conversion formula
The relationship between stones (us) and pounds:
To convert stones (us) to pounds, multiply the value in stones (us) by 12.5. To reverse, multiply pounds by 0.08.
How to use this converter
Type a value into the calculator. The result in pounds updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Pound to Stone (US) converter for the reverse direction.
Step-by-step: convert stones (us) to pounds
- Write down the value in stones (us) (st).
- Multiply that value by the factor 12.5.
- The product is the equivalent value in pounds (lb).
- To reverse, multiply the pound value by 0.08.
Worked examples
Example 1 — Convert 1 st to lb:
1 × 12.5 = 12.5 lb
Example 2 — Convert 100 st to lb:
100 × 12.5 = 1250 lb
Real-world example — Maritime depth conversion
A 10-stone (us) sounding depth converts cleanly into pounds. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 st × 12.5 = 125 lb
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 st × 12.5 = 12.5 lb
Real-world example — Adult height conversion
A 1.8-stone (us)-tall person measures a value in pounds that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 st × 12.5 = 22.5 lb
Stone (US) to Pound conversion table
Standard reference values for converting stones (us) to pounds:
| Stone (US) [st] | Pound [lb] |
|---|---|
| 0.01 | 0.125 |
| 0.1 | 1.25 |
| 1 | 12.5 |
| 2 | 25 |
| 3 | 37.5 |
| 4 | 50 |
| 5 | 62.5 |
| 10 | 125 |
| 20 | 250 |
| 30 | 375 |
| 40 | 500 |
| 50 | 625 |
| 100 | 1250 |
| 500 | 6250 |
| 1000 | 12500 |
Frequently asked questions
How many pounds is 1 stone (us)?
How do I convert stones (us) to pounds?
How do I convert pounds back to stones (us)?
How many pounds is 100 stones (us)?
Popular weight unit conversions
Convert Stone (US) to other weight units
Show all Stone (US) conversions
Metric / SI (18 units)
Avoirdupois (14 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 st = 12.5 lb) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.