---
title: "21 lb to st = 1.5 st"
description: "21 pounds is 1.5 stone. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/21-lbs-to-stone/
site: "At One Place"
---

# 21 lb to st

**21 pounds in stone: 21 lb = 1.5 st**

st = lb × 1/14

21 pounds is 1.5 stone. To get there, multiply by 0.07142857143.

## Values either side

*Pounds near 21, converted to stone.*

| Pounds | Stone |
| --- | --- |
| 17 lb | 1.214286 |
| 18 lb | 1.285714 |
| 19 lb | 1.357143 |
| 20 lb | 1.428571 |
| 21 lb ← | 1.5 |
| 22 lb | 1.571429 |
| 23 lb | 1.642857 |
| 24 lb | 1.714286 |
| 25 lb | 1.785714 |

## How the conversion works

The relationship is st = lb × 1/14. Both units measure mass, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

## Common questions

### What is 21 lb in stone?

21 lb is 1.5 st.

### How do you convert pounds to stone?

Multiply by 0.07142857143.

## Related pages

- [Pounds to stone](https://atoneplace.net/convert/lbs-to-stone/)
- [21 st to lb](https://atoneplace.net/convert/21-stone-to-lbs/)
- [17 lb to st](https://atoneplace.net/convert/17-lbs-to-stone/)
- [18 lb to st](https://atoneplace.net/convert/18-lbs-to-stone/)
- [19 lb to st](https://atoneplace.net/convert/19-lbs-to-stone/)
- [20 lb to st](https://atoneplace.net/convert/20-lbs-to-stone/)
- [22 lb to st](https://atoneplace.net/convert/22-lbs-to-stone/)
- [23 lb to st](https://atoneplace.net/convert/23-lbs-to-stone/)
- [24 lb to st](https://atoneplace.net/convert/24-lbs-to-stone/)
- [25 lb to st](https://atoneplace.net/convert/25-lbs-to-stone/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)