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Calories (small, thermochemical) to Kilocalories (food calories) (cal to kcal)

Convert calories (small, thermochemical) to kilocalories (food calories): 1 cal = 0.001 kcal. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

Formula

1 cal = 0.001 kcal

kilocalories (food calories) = calories (small, thermochemical) × 0.001 — reverse: calories (small, thermochemical) = kilocalories (food calories) × 1000

The factor is derived from the SI definitions of both units (base unit: J) 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 cal = 0.005 kcal
12.5 cal = 0.0125 kcal
100 cal = 0.1 kcal

Calories (small, thermochemical) to kilocalories (food calories) conversion table

Calories (small, thermochemical) (cal)	Kilocalories (food calories) (kcal)
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 kilocalories (food calories) are in one calorie?

1 cal = 0.001 kcal. 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 calories (small, thermochemical) to kilocalories (food calories)?

Multiply the value in calories (small, thermochemical) by 0.001: kilocalories (food calories) = calories (small, thermochemical) × 0.001. For example, 5 cal = 0.005 kcal.

How do I convert kilocalories (food calories) back to calories (small, thermochemical)?

Multiply by the inverse factor 1000 (calories (small, thermochemical) = kilocalories (food calories) × 1000), or use the kilocalories (food calories)-to-calories (small, thermochemical) page.

Related conversions

Machine access

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