Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Pounds to Stone
Convert lb to st instantly, then review the formula, assumptions, and rounding guidance.
Weight & massInstant result
Decimals
Formula result = input × 0.45359237 ÷ 6.35029318. 1 lb = 0.0714 st
Common examples
One value, several units
Kilograms0.4536 kg
Grams453.5924 g
Milligrams453,592.37 mg
Metric tonnes0.0005 t
Ounces16 oz
Stone0.0714 st
Conversion table
| lb | st |
|---|---|
| 1 lb | 0.0714 st |
| 2 lb | 0.1429 st |
| 5 lb | 0.3571 st |
| 10 lb | 0.7143 st |
| 25 lb | 1.7857 st |
| 50 lb | 3.5714 st |
| 100 lb | 7.1429 st |
Conversion chart
1 lb0.0714 st
5 lb0.3571 st
10 lb0.7143 st
25 lb1.7857 st
50 lb3.5714 st
Worked example
1 kilogram equals 2.20462 pounds.
Unit definition
Pounds (lb) One pounds equals 0.45359237 kilogram.
Unit history
Pounds is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert lb to kilogram.
3. Convert the base value to st and apply your display precision.
Understand the result before using it
Pounds to Stone converts a value measured in Pounds (lb) into the equivalent value in Stone (st). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 0.45359237 ÷ 6.35029318
Assumptions
- Pounds and Stone represent the same weight & mass quantity.
- The input is expressed in lb; the output is expressed in st.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 lb = 0.0714285714286 st. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a lb measurement in a document that expects st.
- Compare a pounds value with a value reported in stone.
- Check the lb-to-st arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Everyday language often says weight, but these units represent mass. Force requires a local gravitational acceleration.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Pounds to Stone?
result = input × 0.45359237 ÷ 6.35029318 Using the displayed relationship, 1 lb equals 0.0714285714286 st.
How many Stone are in one Pounds?
One Pounds is 0.0714285714286 Stone. The displayed digits may be rounded.
Can I reverse the lb to st conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts st back to lb.
Is the Pounds to Stone result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.