Convert Carats to US tons
1 carat is 2.20e-7 ton. One carat is exactly 2.20462262185e-7 US tons.
One carat is 2.2046 × 10^-7 US tons. To convert carats to US tons, multiply by 2.2046 × 10^-7; to go the other way, divide by 2.2046 × 10^-7 or multiply by 4.5359 × 10^+6. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 44. Exactly 200 milligrams, fixed by international agreement in 1907 after centuries of local carats.
Factor checked against the defining standard · How we check
- Carats × 2.2046 × 10^-7
1 * 0.00000020 ton
1 carat in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 0.00705479239 oz | × 0.00705479238992 |
| pounds | 0.0004409245244 lb | × 0.00044092452437 |
| stone | 0.00003149460888 st | × 0.0000314946088836 |
| US tons | 0.0000002204622622 ton | × 0.000000220462262185 |
| micrograms | 200,000 mcg | × 200,000 |
| milligrams | 200 mg | × 200 |
| centigrams | 20 cg | × 20 |
| grams | 0.2 g | × 0.2 |
| kilograms | 0.0002 kg | × 0.0002 |
| slugs | 0.00001370435317 slug | × 0.0000137043531714 |
| tonnes | 0.0000002 t | × 0.0000002 |
| carats (as entered) | 1 ct | — |
| troy ounces | 0.006430149314 ozt | × 0.00643014931373 |
| grains | 3.086471671 gr | × 3.08647167059 |
| long tons | 0.0000001968413055 LT | × 0.000000196841305522 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert carats to US tons? The converter and the working
- 1.Take the measurement in carats.
- 2.Multiply by 2.2046 × 10^-7 — that is how many US tons fit in one carat.
- 3.To go back the other way, divide by 2.2046 × 10^-7, or multiply by 4.5359 × 10^+6.
Worked example: 25 carats to US tons
- Formula
- ct × 2.2046 × 10^-7 = ton
- Arithmetic
- 25 × 2.2046 × 10^-7 = 0.000005512 ton
- Answer
- 25 ct = 0.000005512 ton
The factor is rounded for display; the figure above is computed from the full value.
Carats to US tons conversion table
| Carats | US tons |
|---|---|
| 1 ct | 2.20e-7 ton |
| 2 ct | 4.41e-7 ton |
| 3 ct | 6.61e-7 ton |
| 4 ct | 8.82e-7 ton |
| 5 ct | 0.000001102 ton |
| 6 ct | 0.000001323 ton |
| 7 ct | 0.000001543 ton |
| 8 ct | 0.000001764 ton |
| 9 ct | 0.000001984 ton |
| 10 ct | 0.000002205 ton |
| 12 ct | 0.000002646 ton |
| 15 ct | 0.000003307 ton |
| 20 ct | 0.000004409 ton |
| 25 ct | 0.000005512 ton |
| 50 ct | 0.00001102 ton |
| 100 ct | 0.00002205 ton |
| 200 ct | 0.00004409 ton |
| 300 ct | 0.00006614 ton |
| 500 ct | 0.0001102 ton |
| 1000 ct | 0.0002205 ton |
| 2000 ct | 0.0004409 ton |
| 5000 ct | 0.001102 ton |
| 10000 ct | 0.002205 ton |
What is a carat?
Exactly 200 milligrams, fixed by international agreement in 1907 after centuries of local carats. It weighs a gemstone; the karat that grades gold is a different word for a different thing — purity in twenty-fourths.
What is a US ton?
The short ton: 2,000 pounds. A metric tonne is about 10% heavier and a British long ton about 12%.
How many US tons are in a carat?
One carat is 2.2046 × 10^-7 US tons. Going the other way, one US ton is 4.5359 × 10^+6 carats. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a carat.
Cite this page
- APA
- Rule Calculator. (2026). Convert Carats to US tons. Rule Calculator. https://rulecalculators.com/convert/carat-to-ton
- MLA
- "Convert Carats to US tons." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/carat-to-ton.
- Chicago
- Rule Calculator. "Convert Carats to US tons." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/carat-to-ton.
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Questions people actually ask
- How many US tons are in a carat?
- 2.2046 × 10^-7. The short ton: 2,000 pounds. A metric tonne is about 10% heavier and a British long ton about 12%.
- How do I convert US tons back to carats?
- Divide by 2.2046 × 10^-7, or multiply by 4.5359 × 10^+6 — they are the same operation.
Other weight conversions
US tons to carats — the same conversion the other way.