---
title: "Carats to Ounces — ct to oz converter"
description: "1 carat = 0.0070548 ounces. Convert carats to ounces with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/carats-to-oz/
site: "At One Place"
---

# Carats to ounces

**1 carat in ounces: 1 ct = 0.0070548 oz**

oz = ct × 0.00705479239

To convert carats to ounces, multiply by 0.00705479239. The table below gives the values people look up most often, and the converter works for any number.

## Carats to ounces table

*Common carat values converted to ounces.*

| Carats | Ounces |
| --- | --- |
| 1 ct | 0.0070548 |
| 2 ct | 0.01411 |
| 3 ct | 0.021164 |
| 4 ct | 0.028219 |
| 5 ct | 0.035274 |
| 10 ct | 0.070548 |
| 15 ct | 0.10582 |
| 20 ct | 0.1411 |
| 25 ct | 0.17637 |
| 30 ct | 0.21164 |
| 40 ct | 0.28219 |
| 50 ct | 0.35274 |
| 75 ct | 0.52911 |
| 100 ct | 0.70548 |
| 250 ct | 1.763698 |
| 500 ct | 3.527396 |
| 1,000 ct | 7.054792 |

## How the conversion works

The relationship is oz = ct × 0.00705479239. 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

### How many ounces are in one carat?

One carat equals 0.0070548 ounces. oz = ct × 0.00705479239.

### How do you convert carats to ounces?

Use oz = ct × 0.00705479239. So 10 ct is 0.070548 oz.

### How many carats are in one ounce?

One ounce equals 141.7476 carats, which is the reverse of the conversion above.

## Related pages

- [Ounces to Carats](https://atoneplace.net/convert/oz-to-carats/)
- [Carats to Kilograms](https://atoneplace.net/convert/carats-to-kg/)
- [Carats to Grams](https://atoneplace.net/convert/carats-to-grams/)
- [Carats to Milligrams](https://atoneplace.net/convert/carats-to-mg/)
- [Carats to Tonnes](https://atoneplace.net/convert/carats-to-tonnes/)
- [Carats to Pounds](https://atoneplace.net/convert/carats-to-lbs/)
- [Carats to Stone](https://atoneplace.net/convert/carats-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/)