Energy calculators

Built around Indian tariffs, fuel prices and grid emission factors. Nothing you enter is stored, and no sign-up is required.

Home & personal

Estimate payback, lifetime savings and CO₂ avoided for a rooftop solar system in India.

Break your bill into slab charges, fixed charges and duties, and see the true cost of your next unit.

Size an inverter battery bank correctly for your real backup load, including depth of discharge and conversion losses.

Work out exactly what any appliance costs you per month, and what upgrading to a 5-star model saves.

Find the exact break-even month where an electric car becomes cheaper than its petrol equivalent.

Work out your surplus or shortfall of carbon credit certificates under India's CCTS, and what it is worth.

Compare the per-unit cost of running a diesel generator against a captive solar plant for the same load.

Estimate annual generation, capacity factor and per-unit cost from rotor diameter and site wind speed.

Levelised cost per kilogram of electrolytic hydrogen from electricity price, electrolyser cost and utilisation.