Energy & Utility calculators

Work out an electricity bill from kWh + tariff, the per-month cost of a single appliance, AC tonnage for a room, solar-panel payback period, or home EV-charging cost — without poring over the utility’s rate card.

9 calculators
Utility bills
🔌Electricity bill
Bill from kWh × slab tariffs + fixed charges + tax.
🔥Gas bill
m³ / therms × tariff + standing charge + VAT.
💧Water bill
Slab tariffs for kL + sewerage + fixed charge.
🧊Appliance running cost
Per-day / per-month cost of any appliance at your tariff.
Sizing & backup
❄️AC tonnage
Room sqft + climate ⇒ recommended AC tonnage / BTU.
🌡️Heat pump COP
vs gas boiler / electric resistance heating.
⛽Generator fuel
Diesel / petrol consumption by kVA + load.
☀️Solar payback
Years to recoup install cost from annual savings.
🔋EV home charging
Cost per full charge + per-km from home tariff.