Joules to Watt-hours Calculator
Convert energy between Joules (J) and Watt-hours (Wh). Calculate power consumption, battery capacity, and energy conversion for electrical systems.
Step 1: Energy Value
Energy Conversion Formula
1 Watt-hour (Wh) = 3600 Joules (J)
1 Joule (J) = 0.000277778 Watt-hours (Wh)
Step 2: Settings
Common Energy Equivalents
• 1 Wh = 3600 J
• AA Battery: ~3.9 Wh = 14,040 J
• Smartphone Battery: ~10 Wh = 36,000 J
• 1 kWh = 3,600,000 J
• Human Daily Energy: ~8,360,000 J
Energy Conversion Results
Energy Conversion Result
Energy Source Comparison
| Energy Source | Joules (J) | Watt-hours (Wh) | Common Use |
|---|
Energy Conversion Formulas
Basic Conversion Formulas
• Watt-hours = Joules ÷ 3600
• Joules = Watt-hours × 3600
• Kilowatt-hours = Watt-hours ÷ 1000
• Megajoules = Joules ÷ 1,000,000
Where:
• 1 Watt-hour = 3600 Joules
• 1 Joule = 0.000277778 Watt-hours
• 1 kWh = 3.6 million Joules
Example Calculation
Example: Smartphone Battery (10 Wh)
Given: 10 Watt-hours
Calculation to Joules:
10 Wh × 3600 = 36,000 J
Calculation to kWh:
10 Wh ÷ 1000 = 0.01 kWh
Real-world context:
• Can charge a smartphone once
• Equivalent to 36 kJ of energy
• About 0.00001% of daily human energy
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