Use the Energy Cost Calculator to estimate device electricity cost from watts, hours of use and your own tariff. The tool shows its assumptions so you can change them rather than relying on a hidden market average.
Estimated monthly energy cost——
Formula used
monthly cost = watts ÷ 1,000 × hours/day × days × price/kWh
How to use the result
- Enter measurements or rates you can verify.
- Check the result for obvious unit mistakes.
- Save the assumptions with your project notes.
- Replace estimates with product data or real quotations as they become available.
Important limitations
- Real devices may cycle or modulate
- Standing charges and taxes may be separate
- Use your current tariff for the strongest estimate
Before you buy or sign
- Verify measurements on site
- Use product-specific coverage or waste guidance where available
- Confirm taxes, delivery, permits, labour and disposal separately when relevant
- For safety-critical or structural work, use an appropriately qualified professional
Why RepairCostPilot shows the assumptions
A calculator is useful only when you can see what drives the result. These tools deliberately use simple inputs and avoid pretending that one national figure is an exact local contractor price.