Convert Ounces (oz) to Tonnes (t)
1 ounce equals 2.83495 × 10⁻⁵ tonnes.
Formula:
t = oz × 2.83495 × 10⁻⁵
Ounce to Tonne Converter
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How to Convert Ounce to Tonne
1 ounce = 2.83495 × 10-5 tonnes
Tonne = Ounce × 2.83495 × 10-5
Example: 1 oz × 2.83495 × 10-5 = 2.83495 × 10-5 t
Reverse Conversion
To convert tonnes back to ounces:
- Remember, 1 tonne equals 35274 ounces.
- To convert 2.83495 × 10-5 t to oz, multiply
2.83495 × 10-5 x 35274, resulting in1 oz.
Common Ounce to Tonne Conversions
| Ounce | Tonne | Actions |
|---|---|---|
| 50 ounces | 0.00141748 tonnes | |
| 100 ounces | 0.00283495 tonnes | |
| 500 ounces | 0.0141748 tonnes | |
| 1000 ounces | 0.0283495 tonnes |
Ounces to tonnes Conversion Table
Reference table with common ounces to tonnes conversions. All values calculated with high precision.
Ounces to Tonnes Table
100000 to 1 × 1010
Tonnes to Ounces Table
1 to 100000
Definition of Ounce
- Definition
- The ounce (oz) is a unit of mass equal to one sixteenth of a pound in the avoirdupois system. It is commonly used for food portions, postal items, and small packages.
The ounce remains prevalent in countries using imperial or US customary units. - Exact factor
- 1 oz = 28.349523125 g = 0.0625 lb
- Examples
- • 16 oz = 1 lb
• 8 oz ≈ 226.8 g
Definition of Tonne
- Definition
- The tonne (t), also called the metric ton, is a metric unit of mass equal to one thousand kilograms. It is commonly used in industry, shipping, and science.
The tonne provides a convenient scale for large masses while remaining compatible with the SI system. - Exact factor
- 1 t = 1000 kg = 2204.6226218 lb
- Examples
- • 1.5 t = 1500 kg
• 2 t ≈ 4409.25 lb
About the Ounce
Facts & Uses
- Avoirdupois ounce equals 1/16 of a pound = exactly 28.349523125 grams (derived from the 1959 Agreement on the pound).
- Standard unit for food portions (deli meats, cheese), postal letter weights (US 1st-class mail), and beverage servings (a 12 oz soda can).
- Common in cooking for both dry and fluid ingredients in the US — though the fluid ounce (volume) and ounce (mass) are unrelated and frequently confused.
- Used in boxing glove weights (8 oz / 10 oz / 12 oz), archery (arrow weight), and jewelry for non-precious metal items.
Curiosities
- The troy ounce (used for gold, silver, platinum) is heavier: 1 troy oz ≈ 31.1035 g, vs. 28.35 g for avoirdupois — a ~10% difference that matters at bullion prices.
- The symbol "oz" derives from the medieval Italian onza, in turn from the Latin uncia meaning "a twelfth part" (originally 1/12 of a Roman pound).
- 16 oz (1 lb) of feathers and 16 oz (1 lb) of gold weigh the same in avoirdupois — but the gold would actually weigh more if measured in troy ounces, since 1 lb troy = 12 troy oz only.
- 1 oz ≈ 28.35 g ≈ 437.5 grains.
Sources
About the Tonne
Facts & Uses
- Also called the metric ton, equal to exactly 1000 kilograms. Recognized as a non-SI unit accepted for use with the SI by the BIPM.
- Standard for industrial production (steel, cement, grain harvests), international shipping (cargo manifests, container weights), and environmental reporting (CO₂ emissions in tonnes).
- Used in vehicle weight ratings (a small car ≈ 1–1.5 t; a fully loaded semi-truck ≈ 40 t in the EU), mining, and agriculture.
- Distinct from the US short ton (2000 lb ≈ 907 kg) and the UK long ton (2240 lb ≈ 1016 kg) — confusion between the three is a common source of trade disputes.
Curiosities
- The international symbol is "t" (lowercase) — the uppercase T is reserved for the tesla (magnetic flux density), an entirely unrelated SI unit.
- Global annual CO₂ emissions are measured in billions of tonnes (Gt); a single transatlantic flight emits about 1 t of CO₂ per passenger.
- The blue whale, the largest animal ever known, weighs up to 180 tonnes — equivalent to about 30 African elephants.
- 1 t = exactly 1000 kg = 2204.62 lb ≈ 1.102 short tons ≈ 0.984 long tons.
Sources
Frequently Asked Questions
How many tonnes are in one ounce?
One ounce equals 2.83495 × 10-5 tonnes. To convert, multiply the ounce value by 2.83495 × 10-5. For the reverse, divide the tonne value by 2.83495 × 10-5 (or multiply by 35274).
What is 74 ounces in tonnes?
74 ounces = 0.0020979 tonnes. This is one of the most commonly searched conversions for this pair.
How precise is the ounce-to-tonne conversion?
The factor 2.83495 × 10-5 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.
Looking for the reverse? Convert Tonne to Ounce
Related Weight (Mass) Converters
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Need a combined format?
- Kg to Pounds and Ounces — combined lb + oz format
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- G-force to m/s² — Force = mass × acceleration (F = ma)
Conversion factors verified against NIST (National Institute of Standards and Technology), BIPM (International Bureau of Weights and Measures)
1 lb = 0.45359237 kg by international agreement (1959).
Last reviewed: March 2026
