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Grams to Kilograms (g to kg)

Convert grams to kilograms: 1 g = 0.001 kg. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

Formula

1 g = 0.001 kg

kilograms = grams × 0.001 — reverse: grams = kilograms × 1000

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 = 0.005 kg
12.5 g = 0.0125 kg
100 g = 0.1 kg

Grams to kilograms conversion table

Grams (g)	Kilograms (kg)
1	0.001
2	0.002
3	0.003
4	0.004
5	0.005
6	0.006
7	0.007
8	0.008
9	0.009
10	0.01
15	0.015
20	0.02
25	0.025
30	0.03
40	0.04
50	0.05
75	0.075
100	0.1
200	0.2
250	0.25
500	0.5
1000	1

FAQ

How many kilograms are in one gram?

1 g = 0.001 kg. 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 kilograms?

Multiply the value in grams by 0.001: kilograms = grams × 0.001. For example, 5 g = 0.005 kg.

How do I convert kilograms back to grams?

Multiply by the inverse factor 1000 (grams = kilograms × 1000), or use the kilograms-to-grams page.

Related conversions

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