Conversor de Energía

Ingresa un valor para convertir

Energy in food and activities

Everyday references to understand energy magnitudes

16 kcal

67 kJ

2 sugar cubes

Each cube ≈ 8 kcal

80 kcal

335 kJ

Medium apple

Fresh fruit ~150 g

250 kcal

1,046 kJ

Chocolate bar

Standard bar 50 g

300 kcal

1,255 kJ

Running 30 min

Person ~70 kg

2,000 kcal

8,368 kJ

Daily diet

Average adult (WHO)

~250K kcal

~1 GJ

Lightning bolt

Electrical discharge

Reference table

Source / Activity	kcal	kJ	cal
1 sugar cube	8	33.5	8,000
Medium apple	80	335	80,000
Coffee with milk	80–120	335–502	80,000–120,000
Chocolate bar (50 g)	250	1,046	250,000
Running 30 min (70 kg)	~300	~1,255	~300,000
Swimming 1 hour	~400	~1,674	~400,000
Adult daily intake	2,000	8,368	2,000,000

Conversion formulas

kcal → kJ

kJ = kcal × 4.184 Example: 500 kcal = 2,092 kJ

cal → kcal

kcal = cal ÷ 1,000 Example: 80,000 cal = 80 kcal

About the units

cal

Calorie. Energy needed to raise 1 g of water by 1 °C. A small unit used in physics and chemistry. Do not confuse with kcal.

kcal

Kilocalorie. 1 kcal = 1,000 cal. In nutrition, the "calories" on food labels are always kilocalories. This is the unit shown on product packaging.

Kilojoule. SI unit. 1 kJ = 1,000 J. The most widely used unit in Europe for labeling the energy value of foods alongside kcal.

Quick tips

Common confusion: the "calories" in diet are actually kcal. A 250 kcal chocolate bar = 250,000 actual cal.
Quick conversion: kcal × 4 ≈ kJ (exact is × 4.184).
WHO recommends 2,000–2,500 kcal/day for adults depending on activity level.

Interesting fact

The energy equivalent of 1 kg of body fat is approximately 7,700 kcal. To lose 1 kg of fat you need an accumulated deficit of that magnitude.