36 calculators

Energy & environment calculators

Solar arrays, battery banks, heat pumps, running costs, carbon and water footprints.

A–Z index of all calculators

A

Appliance comparison Compare two appliances on running cost and work out the payback on replacing one.

D

Degree days Degree days from a mean temperature, and the heating energy they imply.

F

Firewood energy Usable energy in a load of firewood, and its cost against gas or electricity.

G

Generator sizing Generator size for a set of loads, allowing for motor starting surge and power factor.
Gravity energy storage Energy stored by lifting water or a mass, with the round-trip efficiency.

H

Home energy audit Annual household energy, cost and carbon from heating, hot water, appliances and travel.
Household carbon footprint Annual carbon dioxide from home energy, driving, flying and diet.

I

Insulation payback Energy, cost and carbon saved by improving a U-value, and how long it takes to pay back.

R

Running cost of a chest freezer Energy and running cost for a chest freezer at about 200 W. At 8 hours a day that is roughly 1.60 kWh, and the calculator prices it at your tariff.
Running cost of a clothes iron Energy and running cost for a clothes iron at about 1200 W. At 0.5 hours a day that is roughly 0.60 kWh, and the calculator prices it at your tariff.
Running cost of a dehumidifier Energy and running cost for a dehumidifier at about 300 W. At 8 hours a day that is roughly 2.40 kWh, and the calculator prices it at your tariff.
Running cost of a desktop computer Energy and running cost for a desktop computer at about 250 W. At 8 hours a day that is roughly 2.00 kWh, and the calculator prices it at your tariff.
Running cost of a dishwasher Energy and running cost for a dishwasher at about 1800 W. At 1.5 hours a day that is roughly 2.70 kWh, and the calculator prices it at your tariff.
Running cost of a games console Energy and running cost for a games console at about 160 W. At 3 hours a day that is roughly 0.48 kWh, and the calculator prices it at your tariff.
Running cost of a hair dryer Energy and running cost for a hair dryer at about 1800 W. At 0.15 hours a day that is roughly 0.27 kWh, and the calculator prices it at your tariff.
Running cost of a hot tub Energy and running cost for a hot tub at about 3000 W. At 4 hours a day that is roughly 12.00 kWh, and the calculator prices it at your tariff.
Running cost of a laptop Energy and running cost for a laptop at about 60 W. At 8 hours a day that is roughly 0.48 kWh, and the calculator prices it at your tariff.
Running cost of a microwave Energy and running cost for a microwave at about 1000 W. At 0.25 hours a day that is roughly 0.25 kWh, and the calculator prices it at your tariff.
Running cost of a pool pump Energy and running cost for a pool pump at about 1100 W. At 8 hours a day that is roughly 8.80 kWh, and the calculator prices it at your tariff.
Running cost of a refrigerator Energy and running cost for a refrigerator at about 150 W. At 8 hours a day that is roughly 1.20 kWh, and the calculator prices it at your tariff.
Running cost of a television Energy and running cost for a television at about 100 W. At 4 hours a day that is roughly 0.40 kWh, and the calculator prices it at your tariff.
Running cost of a toaster Energy and running cost for a toaster at about 1000 W. At 0.1 hours a day that is roughly 0.10 kWh, and the calculator prices it at your tariff.
Running cost of a tumble dryer Energy and running cost for a tumble dryer at about 2800 W. At 1 hours a day that is roughly 2.80 kWh, and the calculator prices it at your tariff.
Running cost of a vacuum cleaner Energy and running cost for a vacuum cleaner at about 900 W. At 0.5 hours a day that is roughly 0.45 kWh, and the calculator prices it at your tariff.
Running cost of a washing machine Energy and running cost for a washing machine at about 500 W. At 1 hours a day that is roughly 0.50 kWh, and the calculator prices it at your tariff.
Running cost of an air conditioner Energy and running cost for an air conditioner at about 1500 W. At 6 hours a day that is roughly 9.00 kWh, and the calculator prices it at your tariff.
Running cost of an air fryer Energy and running cost for an air fryer at about 1500 W. At 0.5 hours a day that is roughly 0.75 kWh, and the calculator prices it at your tariff.
Running cost of an electric kettle Energy and running cost for an electric kettle at about 3000 W. At 0.2 hours a day that is roughly 0.60 kWh, and the calculator prices it at your tariff.
Running cost of an electric oven Energy and running cost for an electric oven at about 2400 W. At 1 hours a day that is roughly 2.40 kWh, and the calculator prices it at your tariff.
Running cost of an electric shower Energy and running cost for an electric shower at about 8500 W. At 0.25 hours a day that is roughly 2.13 kWh, and the calculator prices it at your tariff.
Running cost of an electric space heater Energy and running cost for an electric space heater at about 2000 W. At 4 hours a day that is roughly 8.00 kWh, and the calculator prices it at your tariff.
Running cost of an immersion heater Energy and running cost for an immersion heater at about 3000 W. At 2 hours a day that is roughly 6.00 kWh, and the calculator prices it at your tariff.
Running cost of an induction hob Energy and running cost for an induction hob at about 2000 W. At 1 hours a day that is roughly 2.00 kWh, and the calculator prices it at your tariff.
Running cost of an LED bulb Energy and running cost for an LED bulb at about 9 W. At 5 hours a day that is roughly 0.04 kWh, and the calculator prices it at your tariff.

S

Solar payback Payback period and lifetime return on a solar installation, with self-consumption and export.

W

Wind turbine output Power available in the wind and what a turbine can extract, with the Betz limit.

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