---
title: "21 oz to lb = 1.3125 lb"
description: "21 ounces is 1.3125 pounds. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/21-oz-to-lbs/
site: "At One Place"
---

# 21 oz to lb

**21 ounces in pounds: 21 oz = 1.3125 lb**

lb = oz × 1/16

21 ounces is 1.3125 pounds. To get there, multiply by 0.0625.

## Values either side

*Ounces near 21, converted to pounds.*

| Ounces | Pounds |
| --- | --- |
| 17 oz | 1.0625 |
| 18 oz | 1.125 |
| 19 oz | 1.1875 |
| 20 oz | 1.25 |
| 21 oz ← | 1.3125 |
| 22 oz | 1.375 |
| 23 oz | 1.4375 |
| 24 oz | 1.5 |
| 25 oz | 1.5625 |

## How the conversion works

The relationship is lb = oz × 1/16. 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 oz in pounds?

21 oz is 1.3125 lb.

### How do you convert ounces to pounds?

Multiply by 0.0625.

## Related pages

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

## 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/)