Convert Carats to Long Tons
1 carat (ct) equals 1.968413055 × 10⁻⁷ long tons (ton (UK)).
1 ct = 1.968413055e-7 ton (UK)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk carat to long ton converter to paste a column from Excel.
How to Convert Carat to Long Ton
- 1 ct = 1.968413055 × 10⁻⁷ ton (UK)
- 1 ton (UK) = 5080234.544 ct
- Example: convert 15 ct to ton (UK): 15 ct = 15 × 1.968413055 × 10⁻⁷ ton (UK) = 0.000002952619583 ton (UK)
Reference conditions. ton (UK): Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
ton (UK) = ct × 1.968413055222 × 10⁻⁷
or ton (UK) = ct ÷ 5080234.544
Derivation from SI units:
- 1 ct = 200 mg (metric carat, exact)
- 1 long ton = 2240 lb = 1016.0469088 kg (exact)
- 1 ct = 0.0002 kg ÷ 1016.0469088 kg per ton (UK) = 1.968413055222 × 10⁻⁷ ton (UK)
Both units are defined exactly, so the factor is exact. Carat definition: carat; Long Ton definition: long ton.
Worked examples
- A reading of 0.75 ct converts to 1.476309791 × 10⁻⁷ ton (UK).
0.75 ct × 1.968413055 × 10⁻⁷ = 1.476309791 × 10⁻⁷ ton (UK) - A value of 3 ct is 5.905239166 × 10⁻⁷ ton (UK).
3 ct × 1.968413055 × 10⁻⁷ = 5.905239166 × 10⁻⁷ ton (UK)
Carat to Long Ton conversion table
| Carats (ct) | Long Tons (ton (UK)) |
|---|---|
| 0.1 ct | 1.968413055 × 10⁻⁸ ton (UK) |
| 0.25 ct | 4.921032638 × 10⁻⁸ ton (UK) |
| 0.5 ct | 9.842065276 × 10⁻⁸ ton (UK) |
| 0.75 ct | 1.476309791 × 10⁻⁷ ton (UK) |
| 1 ct | 1.968413055 × 10⁻⁷ ton (UK) |
| 1.5 ct | 2.952619583 × 10⁻⁷ ton (UK) |
| 2 ct | 3.93682611 × 10⁻⁷ ton (UK) |
| 3 ct | 5.905239166 × 10⁻⁷ ton (UK) |
| 5 ct | 9.842065276 × 10⁻⁷ ton (UK) |
| 10 ct | 0.000001968413055 ton (UK) |
| 100 ct | 0.00001968413055 ton (UK) |
Where it's used
Carats are used for diamonds and gemstones, while long tons appear in ship displacement and deadweight tonnage. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Carat to other weight and mass units
| Conversion | 1 ct equals |
|---|---|
| carat to kilogram | 0.0002 kg |
| carat to gram | 0.2 g |
| carat to milligram | 200 mg |
| carat to microgram | 200000 µg |
| carat to metric ton | 2 × 10⁻⁷ t |
| carat to pound | 0.0004409245244 lb |
| carat to ounce | 0.00705479239 oz |
| carat to stone | 0.00003149460888 st |
| carat to short ton | 2.204622622 × 10⁻⁷ ton (US) |
| carat to long ton | 1.968413055 × 10⁻⁷ ton (UK) |
| carat to grain | 3.086471671 gr |
| carat to troy ounce | 0.006430149314 oz t |
Frequently asked questions
How many long tons are in 1 carat?
1 ct = 1.968413055 × 10⁻⁷ ton (UK).
How do I convert carats to long tons?
Multiply the value in ct by 1.968413055 × 10⁻⁷, or divide it by 5080234.544. For example, 15 ct × 1.968413055 × 10⁻⁷ = 0.000002952619583 ton (UK).
Is the ct to ton (UK) conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "carat, metric".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ton, long (2240 lb)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Carats to Long Tons. Retrieved October 17, 2026, from https://scientificconverters.com/mass/carats-to-long-tons/
IEEE
Scientific Converters, "Convert Carats to Long Tons," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/carats-to-long-tons/