Compare desktop and laptop work sessions
This comparison changes both the computer and the work schedule: eight hours on a desktop versus five on a laptop. The sample average wall readings include the active display.
Open CalculatorInputs and calculation
| Tool input | Value |
|---|---|
| Currency | USD |
| Power unit | W |
| Power | 150 |
| Hours per day | 8 |
| Days or equivalent sessions | 20 |
| Duty cycle (%) | 100 |
| Energy price (USD per input kWh) | 0.25 |
| Alternative power (W) | 40 |
| Alternative hours per day | 5 |
| Alternative duty cycle (%) | 100 |
Baseline: 150 ÷ 1,000 × 8 × 20 × 100% = 24 kWh. Alternative: 40 ÷ 1,000 × 5 × 20 × 100% = 4 kWh. Multiply both by 0.25; the baseline minus the alternative is USD 5.00.
Modeled difference · USD 5.00
What the comparison shows
The difference is 20 kWh. It combines two changes: lower draw and shorter sessions. At eight hours, the same laptop draw would use 6.4 kWh over 20 days.
Assumptions and limits
Both power readings are sample averages for active work. Charge and dock losses should be included when measuring the laptop.