Grams to Troy Ounces Converter
Convert precious-metals weights between grams, troy ounces, pennyweight (dwt), kilograms, avoirdupois ounces, and pounds — and optionally multiply by today’s live spot to estimate metal value. Bullion, coins, and jewelry are weighed in troy units, which differ from the everyday weights on a kitchen scale, so this is the converter to use when a dealer quotes troy ounces or a jeweler quotes pennyweight.
Weight converter
| Unit | Equivalent |
|---|
Live spot value (optional)
How Weight Conversion Works
Precious metals are measured in the troy ounce, which is 31.1035 grams — heavier than the avoirdupois ounce (28.3495 g) used for groceries and mail. That’s why a “1 oz” gold coin weighs about 31.1 g, not 28.3 g. The troy system has its own subdivisions: a troy ounce splits into 20 pennyweight (dwt), and one pennyweight is 1.55517 grams. Jewelers and dental-gold buyers still quote in pennyweight, while bullion bars are sold in grams, troy ounces, and kilos (1 kg = 32.1507 troy oz). Knowing which “ounce” a buyer means is the difference between a fair quote and a short one.
Precious Metals Weight Conversion Table
Common conversions across every unit (physical constants — independent of spot price).
| From | Grams | Troy oz | Pennyweight (dwt) | Avoirdupois oz |
|---|---|---|---|---|
| 1 gram | 1 | 0.0322 | 0.6430 | 0.0353 |
| 1 troy ounce | 31.1035 | 1 | 20 | 1.0971 |
| 1 pennyweight (dwt) | 1.5552 | 0.05 | 1 | 0.0549 |
| 1 kilogram | 1000 | 32.1507 | 643.01 | 35.274 |
| 1 avoirdupois ounce | 28.3495 | 0.9115 | 18.229 | 1 |
Grams to Troy Ounces
To convert grams to troy ounces, divide by 31.1035. For example, 100 g ÷ 31.1035 = 3.2151 troy oz. Going the other way, multiply troy ounces by 31.1035 to get grams (1 troy oz = 31.1035 g).
Pennyweight (dwt) to Grams
To convert pennyweight to grams, multiply by 1.55517. So 10 dwt = 15.55 g, and 1 troy ounce (20 dwt) = 31.1035 g. Pennyweight is the unit you’ll most often see from jewelers and dental-gold refiners, so converting it to grams (or troy ounces) is how you sanity-check a scrap quote.
Frequently Asked Questions
- How many grams are in a troy ounce?
- One troy ounce equals 31.1035 grams.
- How many grams are in a pennyweight (dwt)?
- One pennyweight equals 1.55517 grams — exactly 1/20 of a troy ounce.
- How many pennyweights are in a troy ounce?
- 20 pennyweight make one troy ounce.
- What's the difference between a troy ounce and a regular ounce?
- A troy ounce (31.1035 g) is about 10% heavier than the avoirdupois ounce (28.3495 g) used for everyday weights. Precious metals always use troy.
- How do I convert grams to troy ounces?
- Divide the gram weight by 31.1035. For example, 50 g ÷ 31.1035 = 1.6075 troy oz.
- Can I see live metal value?
- Enable the "live spot value" option to multiply troy ounces by today's gold or silver spot and your selected purity.
