# Pounds to stone converter

> Convert pounds to stone (lbs to stone) with the exact factor, a conversion chart and worked steps.

Interactive version: https://www.calcopenly.com/conversion/lbs-to-stones
Subject: Unit converters

Pounds are often used on parcel labels and equipment specifications. This is avoirdupois mass, rather than a force rating. If the source gives pounds plus ounces, combine them correctly before conversion. A carrier's billed weight can also depend on package dimensions.

One pound is about 0.0714285714 stone, so 154 lb is 11 st. To convert lbs to stone, multiply by 0.0714285714; to convert back, multiply by 14.

The international avoirdupois pound is defined as exactly 0.45359237 kg (1959 agreement). The factor has no exact decimal form, so results are computed with 50 significant digits and rounded only for display.

## Inputs

- **Pounds (lb)**

## Results

- Stone (st) — main result
- Conversion
- 1 st in pounds (lb)

## Formula

$$
\text{stone} = \text{pounds} \times 0.0714285714286
$$

## Worked examples

### 154 lb to st

- Pounds (lb): 154 lb
- **Stone: 11 st**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 252 lb to st

- Pounds (lb): 252 lb
- **Stone: 18 st**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 100 lb to st

- Pounds (lb): 100 lb
- **Stone: 7.1428571429 st**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert lbs to stone?

Pounds are often used on parcel labels and equipment specifications. This is avoirdupois mass, rather than a force rating. If the source gives pounds plus ounces, combine them correctly before conversion. A carrier's billed weight can also depend on package dimensions.

### How many stone are in a pound?

One pound is about 0.0714285714 stone. The international avoirdupois pound is defined as exactly 0.45359237 kg (1959 agreement).

### How do you convert lbs to stone?

Multiply the number of pounds by 0.0714285714. For example, 154 lb × 0.0714285714 = 11 st. To go the other way, divide by 0.0714285714.

### How can I estimate lbs to stone without a calculator?

Multiply by 0.07. That is 2% low of the exact factor 0.0714285714, so 154 lb comes out as 10.78 st instead of 11.

### How accurate is the pounds to stone converter?

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “154 lb to st” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

### Where does the method come from?

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.

## Sources

- [NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44, Appendix C: General tables of units of measurement](https://www.nist.gov/pml/weights-and-measures/publications/nist-handbooks/handbook-44)
- [BIPM, The International System of Units (SI Brochure), 9th edition](https://www.bipm.org/en/publications/si-brochure)