Quick answer
What this calculator tells you
Your kitchen or jewelry scale reads grams, but gold and silver prices quote in troy ounces. Enter a gram weight and get the exact troy-ounce figure for spot-price math, plus pennyweights and grains.
Formula
Grams to Troy Ounces Converter formula
Troy ounces = grams / 31.1034768. Example: 100 g = 3.2151 ozt.
Use cases
When to use it
- Turn a scale reading in grams into troy ounces before multiplying by spot price.
- Check a dealer's quoted troy-ounce weight against your own gram measurement.
- Convert bullion bar gram weights (1 g, 10 g, 100 g) into troy ounces.
Limits
What to check before relying on the number
- Do not divide by 28.35 — that is the regular ounce, not the troy ounce.
- Keep four decimal places until the final value calculation.
- Weigh jewelry without stones or clasps when estimating melt value.
FAQ
Common questions
How many grams are in a troy ounce?
One troy ounce equals exactly 31.1034768 grams. This is the unit gold and silver spot prices use.
How many troy ounces is 100 grams of gold?
100 grams equals 3.2151 troy ounces (100 / 31.1034768).
Why not use the regular ounce conversion of 28.35 grams?
A regular (avoirdupois) ounce is 28.3495 grams, about 10% lighter than a troy ounce. Using it overstates your metal weight and its value.