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Grams to Carats (g to ct)

Convert grams to carats: 1 g = 5 ct. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

Formula

1 g = 5 ct

carats = grams × 5 — reverse: grams = carats × 0.2

The factor is derived from the SI definitions of both units (base unit: kg) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.

Worked examples

5 g = 25 ct
12.5 g = 62.5 ct
100 g = 500 ct

Grams to carats conversion table

Grams (g)	Carats (ct)
1	5
2	10
3	15
4	20
5	25
6	30
7	35
8	40
9	45
10	50
15	75
20	100
25	125
30	150
40	200
50	250
75	375
100	500
200	1000
250	1250
500	2500
1000	5000

FAQ

How many carats are in one gram?

1 g = 5 ct. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

What is the formula to convert grams to carats?

Multiply the value in grams by 5: carats = grams × 5. For example, 5 g = 25 ct.

How do I convert carats back to grams?

Multiply by the inverse factor 0.2 (grams = carats × 0.2), or use the carats-to-grams page.

Related conversions

Carats to grams (reverse)
Mass / Weight Converter — all mass units in one tool
Kilograms to Pounds
Pounds to Kilograms
Grams to Ounces
Ounces to Grams
Kilograms to Stone
Stone to Kilograms
Pounds to Ounces
Ounces to Pounds

Machine access

API: GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=g&to_unit=ct
MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"g","to_unit":"ct"}
Markdown: https://tttkmbb.com/conversion/grams-to-carats.md · JSON: https://tttkmbb.com/conversion/grams-to-carats.json (add ?value= for a result) · Units: /api/v1/units?quantity=mass
OpenAPI operationId: convert_units. Freshness: static. Authentication: none.