Dishwasher vs Handwash
Compare the water and energy cost of a dishwasher to handwashing.
About Dishwasher vs Handwash
A modern dishwasher can outperform handwashing on both water and energy. Comparing the combined cost per load times weekly volume shows the annual difference. Running a full dishwasher instead of handwashing can save hundreds of gallons a month, and the energy comparison settles which is truly cheaper.
Formula
Dishwasher vs Handwash
Cost/load = water/1000 x price + kWh x rate
- load
- One full dishwasher or sink cycle
Worked example
With the default values below, Dishwasher vs Handwash returns Dishwasher Cost/Load of $0.2490. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Dishwasher water/loadminimum 0 gal
- 6 gal
- Dishwasher energy/loadminimum 0 kWh
- 1.5 kWh
- Handwash water/loadminimum 0 gal
- 18 gal
- Electricity rateminimum 0 $/kWh
- 0.15 $/kWh
- Water price per 1000 galminimum 0
- 4
- Loads per weekminimum 1
- 5
Results
- Dishwasher Cost/Load
- $0.2490
- Handwash Cost/Load
- $0.0720
- Monthly Savings (DW)
- $0.00
- Cheaper Option
- Handwashing may be cheaper
- DW Water/Month
- 130 gal
Step by step
- 1Values used
- 2Dishwasher vs Handwash
- 3Dishwasher Cost/Load= 0.2490
- 4Handwash Cost/Load= 0.0720
- 5Monthly Savings (DW)= 0.00
- 6Cheaper Option= Handwashing may be cheaper
- 7DW Water/Month= 130 gal
Assumptions and limits
- The result is derived only from the 6 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Dishwasher vs Handwash calculated?
Cost/load = water/1000 x price + kWh x rate A modern dishwasher can outperform handwashing on both water and energy. Comparing the combined cost per load times weekly volume shows the annual difference.
Why does Dishwasher vs Handwash matter?
Running a full dishwasher instead of handwashing can save hundreds of gallons a month, and the energy comparison settles which is truly cheaper.
What values do I need to enter?
This calculator takes 6 inputs: Dishwasher water/load, Dishwasher energy/load, Handwash water/load, Electricity rate, Water price per 1000 gal, Loads per week. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.