Ounce to Troy ounce Converter (and vice versa)
Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026
This converter allows you to convert ounces [oz.] to troy ounces [oz.tr.] or troy ounces [oz.tr.] to ounces [oz.]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.
Convert ounces to troy ounces
There are two simple ways to convert ounces [oz.] to troy ounces [oz.tr.]. In the first calculation method, the value in ounces [oz.] is divided by the rounded conversion factor of 1.0971. The second method multiplies the value in ounces [oz.] by the rounded conversion factor of 0.9115.
- Troy ounces [oz.tr.] ≈ ounces [oz.] ÷ 1.0971
- Troy ounces [oz.tr.] ≈ ounces [oz.] * 0.9115
However, rounded conversion values are only suitable for rough conversions, as rounding errors can occur in the calculation result. The most accurate conversion of ounces [oz.] to troy ounces [oz.tr.] can be achieved using the following calculation method.
- Troy ounces [oz.tr.] = ounces [oz.] ÷ 31.1034768 * 28.349523125
Convert troy ounces to ounces
Converting troy ounces [oz.tr.] to ounces [oz.] is easy and can be done in two ways. The first method involves multiplication, in which the value in troy ounces [oz.tr.] is multiplied by the rounded conversion factor of 1.0971. The second variant is a division. Here, the value in troy ounces [oz.tr.] is divided by the rounded conversion factor of 0.9115.
- Ounces [oz.] ≈ troy ounces [oz.tr.] * 1.0971
- Ounces [oz.] ≈ troy ounces [oz.tr.] ÷ 0.9115
However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of troy ounces [oz.tr.] to ounces [oz.] can be achieved using the following calculation method.
- Ounces [oz.] = troy ounces [oz.tr.] * 31.1034768 ÷ 28.349523125
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