Ounces to Tonnes Converter

About the oz to t calculation

One ounce is exactly 0.00002835 tonnes, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Common in US recipes and for postal weights. Not the same as a fluid ounce. A metric tonne is exactly 1,000 kg — not the same as a US or imperial ton.

Formula

t = oz × 0.00002835

1 oz = 0.00002835 t
1 t = 35,273.96 oz

Worked example

To convert 16 oz, multiply by 0.00002835: 16 × 0.00002835 = 0.00045359 t.

Frequently asked questions

How many tonnes are in a ounce?

There are 0.00002835 tonnes in one ounce. To convert any amount, multiply the number of ounces by 0.00002835.

How do I convert tonnes back to ounces?

Divide instead of multiplying, or equivalently multiply by 35,273.96. One tonne is 35,273.96 ounces.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between ounces and tonnes is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Ounces: common in US recipes and for postal weights. Not the same as a fluid ounce. Tonnes: a metric tonne is exactly 1,000 kg — not the same as a US or imperial ton.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units