Energy calculators and tools
Choose the figures you want to work out.
Bills and energy prices
Energy bill calculator
Your yearly gas and electricity bill at your region's price cap or your own rates.
Calculate a bill →Why is my bill high?
Three questions to find what to check first: readings, usage, rates or payment.
Check my bill →Meter reading calculator
Turn two meter readings into kWh and cost, including imperial gas meters.
Use my readings →Direct Debit check
See whether your monthly payment matches your use and balance.
Check my payment →Tariff comparison calculator
Compare your current bill with a quoted tariff.
Compare tariffs →Economy 7 calculator
Day/night tariff against a single rate, with your night-use break-even.
Compare Economy 7 →Standing charge calculator
When a low or zero standing-charge tariff stops paying.
Find the break-even →Compare tariffs with your smart meter data
Replay your own half-hourly readings on a single-rate and a time-of-use tariff.
Use my data →Energy support finder
Bill help and home improvement grants you may qualify for, by nation.
Find support →Saving energy at home
Appliance running-cost calculator
Cost per use, month and year for kettles to heaters, with your own rate.
Check appliances →Replace an appliance or keep it?
What a more efficient fridge or washing machine saves, from its energy label.
Check the saving →What should I improve first?
Look up your EPC certificate, then get three practical priorities for your home and budget, with typical costs.
Look up your EPC →Heating and heat pumps
Heat one room or heat yourself?
Heated throw, hot-water bottle or heater: what each costs and what it heats.
Compare options →Hot water calculator
Immersion, gas or heat pump for the same hot water, including a shower.
Compare hot water →Underfloor heating calculator
What an electric floor costs a day and a year, allowing for the thermostat.
Estimate the cost →Repair or replace a boiler
Compare two quotes with any gas saving from a newer boiler.
Compare quotes →Oil and LPG quote checker
Compare delivery quotes on one delivered price per litre and cost of heat.
Compare quotes →Heat pump calculator
Estimate heat pump running costs from four questions.
Estimate costs →Heat pump vs boiler or oil
Compare yearly costs with your gas, oil or LPG heating.
Compare heating →Radiator checker
Check whether a room's radiators suit a heat pump.
Check radiators →Is my home suitable?
Five quick questions about your home.
Check suitability →Compare heat pump quotes
What you would pay, with the grant only where you qualify, and what each quote leaves out.
Compare quotes →Heat pump tariffs
Heat-pump tariff rates for your region against the price cap.
See tariffs →Solar panels and batteries
Solar panel calculator
Estimate how much electricity solar panels could generate.
Estimate solar generation →Solar quote checker
Compare quotes per kWp, with the battery separated and gaps flagged.
Compare quotes →Solar export tariffs
Compare what suppliers pay for exported solar electricity.
Compare export tariffs →Solar battery calculator
See whether adding a battery to solar panels could save more.
Check battery savings →Home battery calculator (no solar)
Could a battery charged at a cheaper rate lower your bill?
Check a battery →Solar and EV charging
See how solar generation compares with electric-car charging.
Solar and EV charging →Electric vehicles
EV charging calculator
Estimate charging cost, time and overnight readiness.
Open calculator →EV charger finder
Find public chargers near a postcode or your location.
Find chargers →Home EV charger chooser
Find home chargers that suit your car, parking and solar panels.
Choose a charger →EV charger installation cost checker
Estimate installation costs and check whether you may qualify for a grant.
Check installation →EV tariff tool
What an EV tariff could cost for your car and region.
See tariffs →EV vs petrol running-cost calculator
Compare the yearly fuel and electricity cost of an EV and a petrol car.
Compare costs →Is a charging membership worth it?
Pay-as-you-go against a network subscription, with the break-even kWh and miles.
Check a membership →Electric car range calculator
Estimated real-world range for your car.
Estimate range →Electric Car Grant checker
Is a car on the GOV.UK grant list?
Check a car →Electric car road tax checker
What an electric car pays in vehicle tax.
Check tax →Local energy
Energy in your area
Local prices, electricity networks and carbon data for your postcode.
Find my area →Power cut checker
Find your network operator, see listed power cuts and report one.
Check for a power cut →Cleanest time to run it
The lowest-carbon start time for laundry, dishwashers or EV charging in your region.
Find a time →