💻 Office
How Many kWh Does a Laptop Use?
Laptop energy cost calculator — see your exact daily, monthly, and yearly electricity cost.
Rate — APRIL 2026
⚡ 50W typical
$
US national average. Edit for your local rate.
Daily Energy Use
0.40
kWh / day
Monthly Cost
$2.26
Yearly Cost
$27.49
Laptop — Cost Breakdown
| Period | kWh Used | Cost ($) |
|---|---|---|
| Per Hour | 0.0500 | $0.0094 |
| Per Day | 0.40 | $0.08 |
| Per Month (30 days) | 12.00 | $2.26 |
| Per Year (365 days) | 146.00 | $27.49 |
⚡ Real-World Comparison
Running a laptop for a full 8-hour workday uses about the same energy as making 4 slices of toast.
3 Ways to Cut Your Laptop Energy Bill
- 🌱
Reduce screen brightness to 50% — the backlight is the single largest power consumer in a laptop.
- 💡
Use the battery saver mode even when plugged in to throttle background tasks and reduce CPU power draw.
- ⚡
Unplug external peripherals like USB drives and mice when not in use, as each draws a small continuous current.
Startup Surge Information
Laptops draw very stable wattage through their DC adapter, with no meaningful startup surge.