How do I convert troy ounces to grams by hand?

Use g = oz t × 31.1034768. The step-by-step panel shows the same calculation with your own numbers substituted in.

Is the answer exact or rounded?

The calculation itself uses the full stored precision of the defined factor. Only the displayed figure is rounded, and the page also shows a shorter everyday value beside the full one.

Can I check the conversion the other way round?

Yes. The result panel converts the answer straight back into your original unit so you can confirm nothing was lost.

Can I download the result?

Yes — the PDF button produces a branded report with your input, the answer, the formula and the full working.

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Unit Conversions & Measures

Troy Ounces to Grams Converter

Convert troy ounces to grams with the exact factor, the working shown step by step and a plain-English explanation.

Your inputs

Change any value to update the result instantly.

Unit Conversions & Measures

Value in troy ouncesPrecious metals are priced per troy ounce, which is heavier than the ordinary ounce.

oz t

Grams

311.03477 g

Conversion factor

1 oz t = 31.1034768 g

Value in kilogram (internal base unit)

0.31103477 kg

Reverse conversion check

311.03477 g = 10 oz t

Rounded for everyday use

311 g

Precious metals are priced per troy ounce, which is heavier than the ordinary ounce.

What this calculator does

Converts a measurement given in troy ounces into grams using the defined conversion factor.

What your result means

The same quantity expressed in g instead of oz t. Nothing about the measurement itself changes.

Formula and working

g = oz t × 31.1034768

1
Start with your value
10 oz t
2
Convert to kilogram
10 × 0.0311034768 = 0.31103477 kg
3
Convert into grams
0.31103477 ÷ 0.001 = 311.03477 g
4
Result
10 oz t = 311.03477 g

Frequently asked questions

Symbols and assumptions

oz t: Input unit — troy ounce
g: Output unit — gram
kg: Base unit used internally for mass and weight

• Both units measure mass and weight, so the physical quantity is unchanged by the conversion.
• The relationship is exactly linear: 1 oz t = 31.1034768 g.
• Values are converted through the SI base unit for this quantity rather than pair by pair.

Sources and review

Reviewed 2026-09-22 · Next review 2027-09-22

The International System of Units (SI Brochure), 9th editionBureau International des Poids et Mesures · 9th edition Guide for the Use of the International System of Units (SI), NIST Special Publication 811 — conversion factorsNational Institute of Standards and Technology · 2008 edition NIST Handbook 44 — Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring DevicesNational Institute of Standards and Technology

• A unit conversion changes how a number is expressed, not how it was measured — the answer can never be more accurate than the value entered.
• Precious metals are priced per troy ounce, which is heavier than the ordinary ounce.

Important limitation

This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.

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