Home Battery Payback Calculator
Estimate whether tariff shifting and avoided grid imports can recover the installed cost of a home battery.
Open decision toolHeat Pump vs Gas Break-Even
Compare useful heat cost from a heat pump and gas boiler, including COP and boiler efficiency.
Open decision toolSolar + Battery vs Solar Only
Estimate whether adding a battery to an existing or planned solar system is financially worthwhile.
Open decision toolEV Tariff Whole-Home Calculator
Compare an EV tariff with your current electricity tariff including the rest of the home's daytime usage.
Open decision toolHeat-Pump Dryer Payback
Estimate how many drying cycles or years are needed to recover a higher appliance purchase price.
Open decision toolAir Fryer vs Oven Cost
Compare cooking cost using actual power, preheat time and cooking duration rather than headline wattage alone.
Open decision toolSolar Self-Consumption Value
Compare the value of using solar generation at home versus exporting it to the grid.
Open decision toolBattery Size Optimiser
Estimate when a larger home battery stops producing worthwhile extra annual savings.
Open decision toolCheap-Rate Appliance Scheduler
Calculate how much shifting dishwasher, washing machine and dryer use to off-peak periods could save.
Open decision toolBuilt around the decision
Most energy calculators tell you how much one appliance or tariff costs. Energy Decisions UK is designed to answer the harder question: whether paying more upfront or changing tariff is actually likely to save money overall.
All calculations run locally in your browser. The first version uses your own tariff and quote figures rather than paid live-data APIs, keeping the site lightweight and inexpensive to run.