Watt-hours to Kilojoules Converter

Common Conversions

Wh	kJ
0.1	0.36
0.2778	1
0.5	1.8
1	3.6
5	18
10	36
50	180
100	360
500	1800
1000	3600
5000	18000
10000	36000

Why this conversion matters in chemistry

Common case: field-laboratory energy budgeting. A portable battery pack rated at 1500 Wh on the datasheet equals 5400 kJ of stored chemical energy in the form a heat-balance calculation expects. The figure is what a field-expedition chemist uses when budgeting per-day energy for a portable GC-MS, centrifuge, or sample-refrigeration load against the pack's available runtime. A factor of 3.6 kJ per Wh traces back to 1 Wh = 3600 J. The conversion sits at the edge between Wh-rated electrical equipment and the kJ form chemistry-style energy budgets actually use.

Formula

kJ = Wh × 3.6

Worked Examples

1 Wh = 3.6 kJ

The conversion anchor — exact through the SI definitions.

100 Wh = 360 kJ

About a small lab-instrument energy budget.

1000 Wh = 3600 kJ

One kilowatt-hour — about a household-scale energy unit.

0.2778 Wh = 1 kJ

About one kilojoule expressed in Wh — the inverse anchor.

Frequently Asked Questions

How do I convert Wh to kilojoules?

Multiply by 3.6. So 100 Wh becomes 360 kJ. The factor is exact through the SI definitions.

Why does the factor land at 3.6?

1 W = 1 J/s and 1 hour = 3600 s, so 1 Wh = 3600 J = 3.6 kJ. The factor drops out of two definitions, no measurement involved.

Is kJ or Wh more common in chemistry?

Kilojoules dominate chemistry — reaction enthalpies, bond energies, calorimetry. Watt-hours dominate electrical engineering and lab-equipment power use. The conversion sits at the boundary.