Convert Troy Ounces to Kilograms

Formula

kg = oz t × 0.0311034768

or kg = oz t ÷ 32.15074656863

Derivation from SI units:

• 1 oz t = 480 gr = 31.1034768 g (exact)
• SI base unit, fixed by the Planck constant h = 6.626 070 15 × 10⁻³⁴ J·s

Both units are defined exactly, so the factor is exact. Troy Ounce definition: troy ounce; Kilogram definition: kilogram.

Worked examples

1. A reading of 2 oz t converts to 0.0622069536 kg.
   2 oz t × 0.0311034768 = 0.0622069536 kg
2. A value of 32.15 oz t is 0.9999767791 kg.
   32.15 oz t × 0.0311034768 = 0.9999767791 kg

Where it's used

Troy Ounces are used for gold, silver and platinum prices, while kilograms appear in body weight and food packaging. Both measure mass (commonly called weight), so the conversion is a fixed factor.

Troy Ounce to other weight and mass units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (troy or apothecary)".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Section 2.3.1, base unit definitions.

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.