How to Convert Ounces to Tonnes (oz to t)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert ounces into tonnes by hand, with examples and a quick-reference table.
The conversion
To convert ounces to tonnes, multiply the value by 2.834952e-05. To go the other way, divide by the same number (or multiply by 35,273.9619495804). Because the factor is tiny, scientific notation keeps the numbers manageable.
Tonnes = ounces × 2.834952e-05
Worked examples
- 3 oz = 8.504857e-5 t
- 12.5 oz = 0.000354 t
- 75 oz = 0.002126 t
Ounces to Tonnes table
| Ounces | Tonnes |
|---|---|
| 1 oz | 2.834952e-5 t |
| 2 oz | 5.669905e-5 t |
| 5 oz | 0.000142 t |
| 10 oz | 0.000283 t |
| 20 oz | 0.000567 t |
| 25 oz | 0.000709 t |
| 50 oz | 0.001417 t |
| 100 oz | 0.002835 t |
| 250 oz | 0.007087 t |
| 500 oz | 0.014175 t |
| 1,000 oz | 0.02835 t |
Common questions
Is oz to t exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Tonnes to Ounces converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Ounces to Tonnes Converter or browse all weight converters.
Run your own numbers: Ounces to Tonnes Converter