Convert 100 Calories to Joules

Convert between Calories (kcal) and Joules with step-by-step calculation. 1 Calories (kcal) = 4184 Joules.

Calories (kcal) to Joules
Calories (kcal)
Joules
Answer
100 calories (kcal) = 418400 joules
Step 1 — Conversion factor

1 calorie (kcal) = 4184 joules

To convert calories (kcal) to joules, multiply by 4184.

Step 2 — Calculate

100 kcal × 4184 J1 kcal

= 100 × 4184

= 418400 J

100 calories (kcal) = 418400 joules

Calories (kcal) to Joules conversion table
Calories (kcal)Joules
14184
28368
520920
1041840
25104600
50209200
100418400
2501046000
5002092000
10004184000

How to Convert Calories to Joules

Multiply kilocalories by 4184 to get joules.

Formula: J = kcal × 4184

Calorie vs Kilocalorie

In nutrition, "Calorie" (capital C) actually means kilocalorie (kcal). A food label showing "200 Calories" means 200 kcal = 836,800 joules. The small calorie (cal) = 4.184 J is used in chemistry.

Frequently Asked Questions

How many joules in a 2000 calorie diet?

2000 kcal = 8,368,000 J ≈ 8.37 MJ per day.

Why do scientists use joules instead of calories?

The joule is the SI unit of energy, making calculations consistent across physics, chemistry, and engineering.

Complete list of Calories (kcal) conversions
Kilocalories to BTU (thermochemical) Kilocalories to BTU Kilocalories to Calories Kilocalories to Electronvolts Kilocalories to Erg Kilocalories to Foot-pound Kilocalories to Gigajoule Kilocalories to Hartree Kilocalories to Horsepower-Hour Joules to kcal Kilocalories to Kilojoules Kilocalories to Kilowatt-Hours Kilocalories to Megajoule Kilocalories to Megawatt-hour Kilocalories to Quad Kilocalories to Rydberg Kilocalories to Therm Kilocalories to Ton of Coal Equivalent Kilocalories to Ton of Oil Equivalent Kilocalories to Ton of TNT Kilocalories to Watt-Second Kilocalories to Watt-hour