kcal to kJ Converter

Convert Kilocalories to Kilojoules instantly

Formula:

kJ = kcal × 4.184

1 kilocalorie = 4.184 kilojoules

🔗 Related Energy Converters

kJ → kcal kcal → cal cal → kcal J → kJ kJ → J cal → J J → cal ft-lb → Nm Nm → ft-lb All Converters

kcal to cal (Kilocalories → Calories)

1. Core Idea

1 kcal = 1000 cal. Food “Calories” on packaging become 1000 small calories in lab notation.

2. Formula

cal = kcal × 1000

kcal = cal ÷ 1000

Just scale by 1000 (metric prefix kilo).

3. Quick Values

  • 0.5 kcal → 500 cal
  • 1 kcal → 1000 cal
  • 12.5 kcal → 12,500 cal
  • 25 kcal → 25,000 cal
  • 72 kcal → 72,000 cal
  • 185 kcal → 185,000 cal
  • 500 kcal → 500,000 cal
  • 2000 kcal → 2,000,000 cal

4. 3-Step Example

Convert 72 kcal to cal

  1. Formula: cal = kcal × 1000
  2. Insert: 72 × 1000
  3. = 72,000 cal

5. Where It’s Used

Lab reporting, older calorimetry literature, converting consumer labels to scientific notation, teaching energy units.

6. Accuracy & Tips

  • Capital C “Calorie” = kilocalorie.
  • Do not confuse with joules (kcal × 4184 = J).
  • Round daily intake to nearest 10 kcal; exactness rarely needed.
  • For kJ: kcal × 4.184 then optional rounding.

7. More Examples

kcalcal
0.75750
2.22200
48.648,600
360360,000

8. FAQ

Why show small calories at all?

Used historically in lab heat measurements; persists in some academic contexts.

Fast mental kcal → cal?

Append three zeros: 185 kcal → 185000 cal.