Convert Carats to Metric Tons
1 carat (ct) equals 2 × 10⁻⁷ metric tons (t).
1 ct = 2e-7 t
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk carat to metric ton converter to paste a column from Excel.
How to Convert Carat to Metric Ton
- 1 ct = 2 × 10⁻⁷ t
- 1 t = 5000000 ct
- Example: convert 15 ct to t: 15 ct = 15 × 2 × 10⁻⁷ t = 0.000003 t
Formula
t = ct ÷ 5000000
Derivation from SI units:
- 1 ct = 200 mg (metric carat, exact)
- 1 t = 1000 kg (accepted for use with the SI)
- 1 ct = 0.0002 kg ÷ 1000 kg per t = 2 × 10⁻⁷ t
Both units are defined exactly, so the factor is exact. Carat definition: carat; Metric Ton definition: metric ton.
Worked examples
- A reading of 0.75 ct converts to 1.5 × 10⁻⁷ t.
0.75 ct × 2 × 10⁻⁷ = 1.5 × 10⁻⁷ t - A value of 3 ct is 6 × 10⁻⁷ t.
3 ct × 2 × 10⁻⁷ = 6 × 10⁻⁷ t
Carat to Metric Ton conversion table
| Carats (ct) | Metric Tons (t) |
|---|---|
| 0.1 ct | 2 × 10⁻⁸ t |
| 0.25 ct | 5 × 10⁻⁸ t |
| 0.5 ct | 1 × 10⁻⁷ t |
| 0.75 ct | 1.5 × 10⁻⁷ t |
| 1 ct | 2 × 10⁻⁷ t |
| 1.5 ct | 3 × 10⁻⁷ t |
| 2 ct | 4 × 10⁻⁷ t |
| 3 ct | 6 × 10⁻⁷ t |
| 5 ct | 0.000001 t |
| 10 ct | 0.000002 t |
| 100 ct | 0.00002 t |
Where it's used
Carats are used for diamonds and gemstones, while metric tons appear in vehicle and crane capacities. 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 metric tons are in 1 carat?
1 ct = 2 × 10⁻⁷ t.
How do I convert carats to metric tons?
Multiply the value in ct by 2 × 10⁻⁷, or divide it by 5000000. For example, 15 ct × 2 × 10⁻⁷ = 0.000003 t.
Is the ct to t conversion exact?
Yes. Both units are defined exactly, and 1 ct is exactly 2 × 10⁻⁷ t.
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".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8, non-SI units accepted for use with the SI.
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 Metric Tons. Retrieved October 17, 2026, from https://scientificconverters.com/mass/carats-to-metric-tons/
IEEE
Scientific Converters, "Convert Carats to Metric Tons," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/carats-to-metric-tons/