The short answer
Multiply a compatible programme’s kWh per cycle by your electricity price for cost per load. A per-100-cycle label needs division by 100 first. Weighted eco figures do not describe every programme or full load; keep associated water heating, water, detergent and any drying stage on their stated boundaries.
Price a stated wash, rather than a universal load
A useful per-load estimate needs an energy figure for the programme or measurement being modeled. Programme, load and source scope matter alongside the tariff.
An EU eco 40–60 label is a standardized comparison basis. US washer metrics can include associated energy, such as water heating. Neither source should silently be substituted for electricity measured at the socket during a different programme.
Work from a traceable product-sheet figure
Bosch’s WGG244ZCGB GB product sheet, dated 27 August 2026, describes a 9 kg washer with 0.489 kWh per weighted eco 40–60 cycle. At an illustrative £0.28/kWh, that is £0.13692 per stated cycle, displayed as £0.14.
| Routine on the declared basis | Annual cycles | Annual kWh | Electricity at £0.28/kWh |
|---|---|---|---|
| Two cycles/week | 104 | 50.856 | £14.24 |
| Four cycles/week | 208 | 101.712 | £28.48 |
| Seven cycles/week | 364 | 177.996 | £49.84 |
The manufacturer lists this model in its GB catalogue when checked on 3 October 2026. This is a dated availability observation, not a promise of local stock. The energy declaration is a weighted test quantity, not a measurement of every full 9 kg load. Load the example below to use the exact figure with your own routine and price.
Keep the source’s precision and capacity
Bosch’s WAN28258GB product information sheet gives 0.461 kWh per eco 40–60 cycle on its weighted test basis. It is a published figure, not our own test of a load.
At an illustrative £0.28/kWh:
0.461 × £0.28 = £0.12908 per stated cycle, displayed as £0.13.
| Routine assumed for that basis | Annual cycles | Annual kWh | Electricity at £0.28/kWh |
|---|---|---|---|
| Two cycles/week | 104 | 47.944 | £13.42 |
| Four cycles/week | 208 | 95.888 | £26.85 |
| Seven cycles/week | 364 | 167.804 | £46.99 |
The same model’s rounded label reads 46 kWh/100 cycles. The per-100-cycle guide explains why it gives a slightly different result. Keep one source basis throughout a comparison. This older 8 kg reference and the 9 kg example above have different capacities; a smaller per-cycle value alone does not establish which is better for the same laundry task.
Treat other programmes as separate inputs
A quick programme’s shorter duration does not establish lower energy use. A hotter wash should not automatically inherit the eco figure. If you have measured values for separate tasks, group only like tasks together.
Here is an illustrative measurement example, independent of the Bosch document:
| Weekly task group | Illustrative completed-cycle energy | Weekly total |
|---|---|---|
| Three cycles of programme A | 0.50 kWh each | 1.50 kWh |
| One cycle of programme B | 0.90 kWh | 0.90 kWh |
| Four distinct cycles | — | 2.40 kWh |
Across 52 weeks, this is 124.8 kWh and £34.94 at £0.28/kWh. The 0.50 and 0.90 values illustrate grouping; they are not reported measurements or assigned programme averages.
Use a separate household-planner row for each compatible task group, with its own cycle energy and frequency.
Keep washing and drying tasks from overlapping
A washing-only value can be combined with a separate dryer’s energy when their scopes do not overlap. A complete washer-dryer cycle already includes its washing stage; adding that stage again would overstate the total.
Read the combined washer-dryer guide before building those rows. Check US source boundaries too, particularly associated hot-water energy. An appliance estimate and an external water-heater estimate must not charge the same energy twice.
The planner accepts annual and cycle bases independently. Enter a source’s stated annual quantity directly when no compatible per-cycle figure is available.
Keep electricity separate from other laundry costs
The calculation excludes detergent, water, wastewater, repairs and purchase cost. It applies the entered tariff as supplied and adds no taxes. A monthly result is an annual average, rather than a forecast for a particular calendar month.
For the documented 9 kg model, the sheet also declares 50 litres of weighted eco water use per cycle. Price that separately only when you have a compatible consumption-related water/wastewater rate. The electricity calculator does not include it. A fixed water fee does not disappear when one wash is avoided.
Fixed household charges ordinarily belong in a whole-tariff comparison. They do not become avoidable laundry savings merely by allocating a share to every wash.
Test the routine you can actually follow
Load the product-sheet example below or use the washing-machine calculator with your own source.
If your tariff has peak and off-peak prices, estimate the energy falling in each period. Do not assume an even split because half the programme runs in each window. The time-of-use guide explains energy weighting, and the tariff comparison adds fixed charges for a whole-home scenario.
Retain the programme, measurement conditions, tariff date and frequency with any saved result.
Find other exact source inputs in the documented appliance examples. For a combined washer-dryer, check washing-only and complete-task quantities before choosing a cost input.