How many calories are in one kilocalorie?

1 kilocalorie (kcal) equals exactly 1000 small calories (cal). So to convert cal to kcal, divide by 1000. To convert kcal to cal, multiply by 1000.

Is a food Calorie the same as a kilocalorie?

Yes. The "Calorie" (capital C) on nutrition labels in the US is a kilocalorie (kcal). A 300-Calorie meal is 300 kcal, which equals 300,000 small thermochemical calories (cal).

What is a small calorie (cal)?

The thermochemical calorie (cal) is the amount of energy needed to raise 1 gram of water by 1 °C. It equals 4.184 joules. It is used in chemistry and physics, not on food labels.

Why do nutrition labels use Calories instead of kilocalories?

Historical convention in the US nutrition system adopted "Calorie" (capital C) as shorthand for kilocalorie to keep label numbers manageable. Most other countries use kJ or kcal directly.

What is the formula to convert cal to kcal?

kcal = cal ÷ 1000. For example, 5000 cal ÷ 1000 = 5 kcal. Conversely, kcal × 1000 = cal.

Calories to Kilocalories Converter

Name: Calories to Kilocalories Converter
Availability: InStock
Author: Nham Vu

Enter a value in small calories (cal) and instantly get the kilocalorie (kcal) equivalent — and clear up the cal vs. Cal confusion.

Enter Value

Value to convert

Direction

cal → kcal kcal → cal

Result

Enter a value to see the result

Common Conversions

Small calories (cal)	Kilocalories (kcal)	Food label note
100 cal	0.1 kcal	—
1,000 cal	1 kcal	1 food Calorie (Cal)
10,000 cal	10 kcal	10 food Calories
100,000 cal	100 kcal	~1 small candy bar
2,000,000 cal	2,000 kcal	Typical daily adult intake
2,500,000 cal	2,500 kcal	Typical daily intake (active adult)

Summary

Enter a value in small calories (cal) and instantly get the kilocalorie (kcal) equivalent — and clear up the cal vs. Cal confusion.

How it works

Enter a value in small calories (cal) in the input field.
The converter divides the value by 1000 to get kilocalories.
Results update in real time as you type.
Click "Copy" to copy the kcal result to your clipboard.
Use the swap button to convert kilocalories back to small calories.

Use cases

Understand nutrition label Calories (kcal) relative to thermochemical cal values.
Convert lab or chemistry energy measurements from cal to kcal.
Double-check diet tracking apps that mix cal and kcal units.
Convert food energy data for academic or scientific reporting.
Explain the cal vs. Cal distinction to students or clients.
Translate recipe calorie counts between different unit conventions.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu