Grams to Carats Converter
Instantly convert grams to carats — enter any gram value and get the exact carat weight used in gemstone and jewelry measurement.
Grams to Carats
Result in Carats (ct)
—
Formula: carats = grams ÷ 0.2
Carats to Grams (Reverse)
Result in Grams (g)
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Formula: grams = carats × 0.2
Quick Reference — Common Conversions
| Grams (g) | Carats (ct) | Common Context |
|---|---|---|
| 0.2 | 1.0 | 1 carat — definition |
| 0.4 | 2.0 | Small diamond |
| 1.0 | 5.0 | 1 gram = 5 carats |
| 2.0 | 10.0 | Medium sapphire rough |
| 5.0 | 25.0 | Large gemstone piece |
| 10.0 | 50.0 | Heavy rough stone |
| 100.0 | 500.0 | 100 g parcel |
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Summary
Instantly convert grams to carats — enter any gram value and get the exact carat weight used in gemstone and jewelry measurement.
How it works
- Enter a mass value in grams in the input field.
- The tool divides your value by 0.2 to calculate carats.
- The result updates instantly as you type.
- Use the reverse field to convert carats back to grams.
- Copy either result with one click.
Use cases
- Convert gem rough weight from grams to carats before pricing.
- Verify gemstone weights quoted by a jeweler or lab report.
- Calculate multi-stone carat totals from combined gram weights.
- Convert between grams and carats when working with pearls.
- Check diamond weight before and after cutting.
- Quickly sanity-check carat figures on customs or import forms.
- Teach students the gram-to-carat relationship in mineralogy.
- Convert milligrams or kilograms to carats via the gram step.
Frequently Asked Questions
Last updated: 2026-06-09 ·
Reviewed by Nham Vu