How to convert grains to ounces
One grain weighs 0.0648 grams and one ounce weighs 31.1035 grams, so 1 grain = 0.0021 ounces. Multiply any amount in grains by 0.0021 to get ounces, or divide by 0.0021 to go back.
Example
10 grains × 0.0021 = 0.0208 ounces. At today's price, that weight of pure gold is worth $86.26.
Why units matter for precious metals
Bullion is priced in troy ounces, jewelry in grams, South Asian markets in tolas and Chinese markets in taels. Mixing up the avoirdupois ounce (28.35 g) and troy ounce (31.10 g) is a common 9.7% error when comparing prices.
- Ask sellers which ounce they mean.
- Convert everything to grams before comparing offers.
- Use the exact factors on this page rather than rounded ones for large amounts.
Live values use MetalflowAPI prices.