🏡 Home, Energy & Environment

9 calculators in this category.

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Find what makes your electricity bill high, whether rooftop solar pays off, the right AC size for your room and how long your inverter will last.

Then work out your household's carbon footprint, the rainwater your roof can collect, and what your daily commute — or an electric car — really costs.

Appliance Electricity Cost

Work out the electricity units and cost of your AC, fans, fridge, geyser, TV, lights and other appliances per day, month and year, and which one costs the most.

Solar Payback

Find the payback period, 25-year savings and ROI of rooftop solar, with the PM Surya Ghar subsidy, your tariff, sunshine and panel degradation.

AC Tonnage & BTU

Calculate the cooling load of a room in BTU per hour and the AC tonnage you need, counting room size, ceiling height, climate, roof, sun, people, kitchen, appliances and windows.

Room AC Size

Find whether your room needs a 1, 1.5 or 2 ton AC from its size, floor, sun and city, and the monthly running cost by star rating.

Rainwater Harvesting

Calculate how many litres of rainwater your roof can collect in a year from its area, your city's rainfall and the roof type, with tank and recharge-pit sizes.

Carbon Footprint

Estimate your household's yearly carbon footprint from electricity, LPG, PNG, petrol, diesel, CNG, flights, diet and shopping, per person and compared with India and the world.

Commute Cost

Work out what your daily commute costs per day, month and year by car, bike, EV, metro, bus or cab — fuel, maintenance, parking, tolls, time and CO₂ — and compare modes.

EV vs Petrol

Compare the total cost of an electric car and a petrol car — price, charging vs fuel, maintenance and insurance — with running cost per km and the year the EV pays back its higher price.

Inverter Backup

Find how many hours your inverter battery will run fans, lights and TV, the battery Ah you need for a target backup time, and the inverter VA rating.

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