Formula used
Cost/cycle = (kWh × ElecRate) + (Water × WaterRate) + Supplies
Supplies includes detergent and a wear-and-tear estimate.
Eco reduces kWh and partly reduces water.
LoadFactor uses 70% fixed + 30% variable scaling.
Time-of-use blends rates by PeakShare percent.
Designed for garden cleaning where pre-rinsing and partial loads change real costs.
How to use this calculator
- Name your cycle for the garden task.
- Enter electricity and water rates from your bill.
- Add energy and water per cycle from testing.
- Include heated dry and pre-rinse if used.
- Set eco savings and load factor realistically.
- Press calculate, then download your report.
Example data table
| Scenario | kWh | Water | Rates (Elec / Water) | Supplies | Estimated cost per cycle |
|---|---|---|---|---|---|
| Eco wash, no pre-rinse | 1.10 | 10 L | 55 / 0.25 | 25 | ~ 1.10×55 + 10×0.25 + 25 |
| Normal, heated dry, full load | 1.80 | 12 L | 55 / 0.25 | 25 | ~ 1.80×55 + 12×0.25 + 25 |
| Pre-rinse for muddy pots | 1.80 | 18 L | 55 / 0.25 | 25 | ~ 1.80×55 + 18×0.25 + 25 |
Why track cycle costs for garden cleaning
Garden loads often include gritty pots, seed trays, and hand tools that need longer wash times and higher temperatures. Tracking per-cycle cost helps you decide when to batch items, when to switch to an eco cycle, and when a quick rinse is enough. It also supports seasonal budgeting for propagation and greenhouse cleanup.
Key inputs that change the total
Energy and water are the biggest drivers, but supplies can matter when you sanitize frequently. Heated dry can add noticeable kWh, while pre-rinsing muddy items increases water use. If your utility has peak pricing, scheduling the run off-peak can reduce the effective electricity rate without changing the cleaning outcome. Keeping notes for two or three cycles makes your averages more reliable.
Eco and load factor settings explained
Eco savings reduces energy and a portion of water to reflect gentler heating and optimized spraying. Load factor recognizes that a partially filled machine still uses most of a cycle’s fixed resources. For best value, aim for full, well-spaced loads that allow spray arms to rotate freely and reach surfaces. Stacking too tightly can force a second wash and doubles the cost.
Sanitation and material care for tools
When cleaning pruning tools, labels, and propagation trays, sanitation can prevent disease spread. Use detergent or sanitizer costs to capture tablets and additives. Avoid placing items with soil clumps that can clog filters. For plastics, skip heated dry if warping is a risk, and use the wear-and-tear field to budget for filters, rinse aid, and periodic maintenance. Choose a rack layout that protects sharp edges.
Turning results into practical decisions
Compare your per-cycle cost against alternatives such as hand washing with a measured bucket or a short hose rinse. If cost per item is high, increase load factor by batching similar items. If electricity dominates, reduce heated dry, choose eco mode, or move cycles to off-peak hours. Recheck inputs quarterly as tariffs, water pricing, and supply costs change. Over a season, small savings can fund extra compost or seedlings.
FAQs
1) What should I enter for kWh per cycle?
Use your dishwasher’s manual, energy label, or a plug-in power meter. If you only have monthly usage, divide dishwasher kWh by estimated cycles to get a workable starting value.
2) Does pre-rinsing always increase total cost?
Usually yes, because it adds water use. It can still be worthwhile for heavy soil if it prevents rewashing. Estimate pre-rinse water realistically and compare the result with the cost of an extra cycle.
3) How does time-of-use pricing affect the calculation?
The calculator blends peak and off-peak rates using your peak-share percentage. If most of the cycle runs off-peak, set a low peak share to reflect scheduling and reduce the effective electricity cost.
4) Why include wear and tear per cycle?
Filters, rinse aid, and maintenance are real costs over time. A small per-cycle estimate helps you budget replacements and keeps comparisons fair when you wash dirty garden equipment frequently.
5) Is the “cost per item” number accurate?
It is a practical estimate based on load factor, not a counted inventory. Use it to compare “full load” versus “half load” habits. For accuracy, track typical items per cycle for your routine.
6) Can I use this for other household loads?
Yes. Rename the cycle and adjust kWh, water, and supply costs. For kitchen dishes, you may set pre-rinse to off and reduce detergent or sanitizer costs if they differ from your garden-cleaning routine.