Fictional worked example

Compare drying time after a faster spin

A renter measures a dryer averaging 2,400 W and wants to compare 45-minute loads with 30-minute loads after using a faster washer spin.

Inputs and calculation

Standard-spin loads
Tool input	Value
Currency	USD
Power unit	W
Power	2400
Hours per day	0.75
Days or equivalent sessions	8
Duty cycle (%)	100
Energy price (USD per input kWh)	0.25

2400 ÷ 1,000 × 0.75 × 8 × 100% = 14.4 kWh. 14.4 × 0.25 rounds to USD 3.60.

Tool result · USD 3.60

Shorter drying sessions
Tool input	Value
Currency	USD
Power unit	W
Power	2400
Hours per day	0.5
Days or equivalent sessions	8
Duty cycle (%)	100
Energy price (USD per input kWh)	0.25

2400 ÷ 1,000 × 0.5 × 8 × 100% = 9.6 kWh. 9.6 × 0.25 rounds to USD 2.40.

Tool result · USD 2.40

Eight shorter sessions save 4.8 kWh in the dryer model. Use Days for the eight one-load sessions.

The same average draw is assumed in both dryer sessions. Check the washer’s extra energy separately when evaluating both machines.