Carats to Tonnes Converter

1 carat (ct) equals 2 × 10-7 tonnes (t).

Quick answer

  • 1 carat = 2 × 10-7 tonnes
  • 1 tonne = 5,000,000 carats
  • Formula: t = ct × 2 × 10-7

1 carat = 2 × 10-7 tonnes

How to convert carats to tonnes

t = ct × 2 × 10-7

To convert carats to tonnes, multiply the number of carats by 2 × 10-7.

Example: 18 ct to t

  1. Start with the value in carats: 18 ct.
  2. Multiply by 2 × 10-7: 18 × 2 × 10-7 = 0.0000036.
  3. Result: 18 carats = 0.0000036 tonnes.

Going the other way, 1 tonne = 5,000,000 carats, so to convert tonnes back to carats you divide by the same number. See tonnes to carats.

Carats to tonnes conversion table

Carats (ct)Tonnes (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
2.5 ct 5 × 10-7 t
3 ct 6 × 10-7 t
4 ct 8 × 10-7 t
5 ct 0.000001 t
6 ct 0.0000012 t
7 ct 0.0000014 t
8 ct 0.0000016 t
9 ct 0.0000018 t
10 ct 0.000002 t
11 ct 0.0000022 t
12 ct 0.0000024 t
13 ct 0.0000026 t
14 ct 0.0000028 t
15 ct 0.000003 t
16 ct 0.0000032 t
17 ct 0.0000034 t
18 ct 0.0000036 t
19 ct 0.0000038 t
20 ct 0.000004 t
21 ct 0.0000042 t
22 ct 0.0000044 t
23 ct 0.0000046 t
24 ct 0.0000048 t
25 ct 0.000005 t
26 ct 0.0000052 t
27 ct 0.0000054 t
28 ct 0.0000056 t
29 ct 0.0000058 t
30 ct 0.000006 t
31 ct 0.0000062 t
32 ct 0.0000064 t
33 ct 0.0000066 t
34 ct 0.0000068 t
35 ct 0.000007 t

More ct to t values

What is a carat?

The carat is the unit of mass for gemstones and pearls, equal to exactly 200 milligrams.

More about carats →

What is a tonne?

The tonne, or metric ton, is a unit of mass equal to 1,000 kilograms, about 2,204.6 pounds.

More about tonnes →

Convert carats to other units

Convert other units to tonnes

Frequently asked questions

How many tonnes are in a carat?

One carat is 2e-7 tonnes.

How many carats are in a tonne?

One tonne is 5,000,000 carats.

What is the formula to convert carats to tonnes?

t = ct × 2 × 10^-7.