# Pounds to Stone Converter

URL: https://speedycalculator.com/calculators/conversion/lbs-to-stone-converter/
Last updated: 2026-10-25

> Convert pounds (lb) to stone (st): 1 pound = 0.071428571 st, so multiply by 0.071428571 or divide by 14. Both fields are editable, so you can also type in stone and get pounds back.

## Inputs

- Pounds (lb)

## Results

- Stone

## Formula

```
1 lb = 0.071428571 st
1 st = 14 lb
st = lb × 0.071428571
```

## Explanation

Divide pounds by 14 to get stone. UK scales, bathroom scales and medical records often still use stone.

### How to use the Pounds to Stone Converter

- Type the number of pounds into the **Pounds** field. Decimals such as 77 are fine.
- Read the answer in **Stone** – it updates as you type, with no button to press.
- To convert the other way, type into **Stone** and the pounds are recalculated.
- Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion.

This page converts only lb ⇄ st. Need a different unit? Use the general weight converter, where you can choose any “from” and “to” unit.

### How it works

Both units measure weight, so they are always in the same ratio: one pound equals 0.071428571 stone. The calculator multiplies the number of pounds you type by 0.071428571 to give stone, and when you type into the stone field it divides by the same factor to give pounds. Because the ratio never changes, doubling the pounds always doubles the stone. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

### How to convert pounds to stone

- Write down the value in pounds, for example **154 lb**.
- Multiply by the conversion factor 0.071428571 (because 1 pound = 0.071428571 st).
- 154 × 0.071428571 = **11 st**.
- To go back from stone to pounds, divide by 0.071428571 – or multiply by 14.

### lb to st conversion table

PoundsStoneStonePounds100 lb7.1428571 st1 st14 lb112 lb8 st2 st28 lb126 lb9 st5 st70 lb140 lb10 st10 st140 lb154 lb11 st20 st280 lb168 lb12 st50 st700 lb182 lb13 st100 st1,400 lb196 lb14 st1,000 st14,000 lb210 lb15 st224 lb16 st

### What is a pound?

The avoirdupois pound is defined as exactly 0.45359237 kg and is divided into 16 ounces. It is the everyday weight unit in the U.S. and is still widely used in the UK for body weight and food.

### What is a stone?

The stone is 14 pounds, about 6.35 kg. People in the UK and Ireland still commonly give their body weight in stones and pounds, such as 11 st 4 lb.

### Quick mental conversion

For a fast estimate, multiply pounds by about **0.071** to get stone; the error is about 0.6%. Use the calculator above when you need the exact figure.

### Common mistakes to avoid

Confusing fluid ounces (volume) with ounces (weight), using troy ounces for food or regular ounces for gold, and mixing u.s. short tons, uk long tons and metric tonnes.

## Worked example

Inputs — Pounds: 154 lb.

Results — **Stone = 11 st**.

## FAQ

**How many stone is 154 lb?**
11 st.

**How many pounds in a stone?**
14.

**How do I convert pounds to stone?**
Multiply the number of pounds by 0.071428571. For example, 154 lb × 0.071428571 = 11 st.

**How do I convert stone back to pounds?**
Divide by 0.071428571 (or multiply by 14), or simply type the value into the stone field above.

**What is 100 lb in stone?**
100 lb = 7.1428571 st.

**Is this conversion exact?**
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.

**Can I convert to other units on this page?**
This page converts only between pounds and stone. To pick any weight unit, use the general weight converter linked under Related calculators.

**What formula does the Pounds to Stone Converter use?**
1 lb = 0.071428571 st.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)