CalcBeast
Know what it really costs.
Practical calculators for UK energy bills, running costs, and home upgrade decisions. Change the assumptions and see the estimate update in your browser.
- Built for UK prices
- Editable assumptions
- No account required
- Browser-based results
Use your own numbers
- 1
Start with a real bill
Use the unit rate, standing charge, wattage, or quote you already have.
- 2
Change one assumption
Adjust hours, efficiency, tariff, or install cost and watch the estimate move.
- 3
Sense-check the decision
Use the result to compare options before you book work or buy equipment.
Calculators
Work out what heating, appliances, and home upgrades actually cost to run. Built for UK energy prices, with gas-vs-electric comparisons before you commit to a quote.
- Loft Insulation Cost Calculator UK Estimate loft insulation cost, DIY versus professional installation, annual heating savings and payback for a UK home.
- Electricity Bill Calculator Calculate a UK electricity bill from kWh usage, unit rate, standing charge, billing period and VAT.
- Gas Boiler Running Cost Calculator Estimate gas boiler running cost per day, month and year from boiler output, usage hours, gas price and efficiency.
- Home Battery Savings Calculator Estimate UK home battery savings and payback from battery capacity, installed cost, tariff spread and round-trip efficiency.
- Heat Pump Running Cost Calculator Estimate UK heat pump running costs from SCOP and electricity price, then compare against a gas boiler.
- Solar Panel Payback Calculator UK Work out solar panel payback, break-even time, bill savings, SEG export income and ROI for a UK home.
- Electricity Cost Calculator Calculate appliance running costs for electric heaters, washing machines, tumble dryers, kettles and more.
- Electric Car Charging Cost Calculator Estimate UK electric car charging cost, EV cost per mile, home charging cost and savings versus petrol.
- Dehumidifier Running Cost Calculator Work out what a dehumidifier costs to run per hour, day and month from its wattage and your electricity price.
- Oil-Filled Radiator Running Cost Calculator Calculate the running cost of an oil-filled radiator per hour and day from its wattage and your unit rate.
- Electric Blanket Running Cost Calculator See what an electric blanket or heated throw costs to run per hour and per night at UK electricity prices.
- Air Conditioning Running Cost Calculator Estimate air conditioning running cost per hour and day for portable and split units at UK prices.