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Appliance Energy Cost Calculator

Turn any appliance's wattage and daily use into a daily, monthly and yearly running cost in your currency.

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Appliance running cost calculatorEstimate what an appliance costs to run per day, month and year.Home Energy Audit CalculatorEstimate your home's annual energy use, cost, intensity and HVAC share from its shell and major appliances.Capacitor energy calculatorCompute the energy stored in a capacitor from its capacitance and voltage (E = ½CV²).Inductor energy calculatorCompute the energy stored in an inductor from its inductance and current (E = ½LI²).E = mc² Calculator (Mass–Energy)Convert mass into energy and back with a realistic efficiency — 100 % for antimatter, 0.7 % for fusion, 0.09 % for fission — and read the result in joules, kWh, kcal and tonnes of TNT.Photon Energy CalculatorEnter a wavelength, a frequency or an energy and get all three from E = hf = hc/λ, in eV, keV, MeV and joules, with the spectral band named and the colour identified for visible light.Heat Loss CalculatorAdd up the conductive heat loss through walls, windows, doors and roof from their area and R- or U-value.HVAC Sizing CalculatorEstimate the heating and cooling load of a room in BTU/hr, kW and tons from its area, climate and insulation.

Appliance Energy Cost Calculator works straight from this page — free, instant, nothing to install. It sits under Energy & power in our catalogue, alongside Appliance running cost calculator and Home Energy Audit Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Appliance Energy Cost Calculator do?

Turn any appliance's wattage and daily use into a daily, monthly and yearly running cost in your currency.

When would I actually use this?

Putting a number on a bill: what an appliance costs to run, whether a solar array covers the load, and how much heating a room actually needs.

What is the most common mistake?

Confusing power with energy. A kilowatt is a rate and a kilowatt-hour is a quantity; a 2 kW heater on for half an hour uses 1 kWh, and only the second figure appears on a bill.

How is Appliance Energy Cost Calculator different from Appliance running cost calculator?

They sit next to each other but answer different questions: Appliance running cost calculator is the one to open when you need it to estimate what an appliance costs to run per day, month and year. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Home Energy Audit Calculator is the closest one after this: Estimate your home's annual energy use, cost, intensity and HVAC share from its shell and major appliances.

What else is worth having open alongside it?

Capacitor energy calculator and Inductor energy calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

The arithmetic is exact for the rating and the tariff you enter. Nameplate wattage is a maximum, not an average, and solar output depends on latitude, orientation and shading that no formula can guess.

Further reading

All guides →
ComparisonInsulate or Replace the Heating: Which Repays First, and Why the Answer InvertsPut both on one axis — euros paid per kilowatt-hour a year of permanent saving — and the comparison becomes decidable. The same loft job costs 0.83 euros per kilowatt-hour a year in a 1965 house and 5.00 in a 2005 one, a factor of six. That, and not the age of the building by itself, is what inverts the verdict.How-toHow to Estimate the Running Costs of a HomeAdd up energy, water, heating, and maintenance with simple rules of thumb so you know what a home really costs to run each month.How-toHow Much Does an Appliance Cost to Run? A Simple MethodTurn an appliance's wattage and daily hours into an annual running cost using one formula: power times hours times your price per kWh.How-toHow Many Amps Does an Appliance Draw?Divide the appliance wattage by the supply voltage to get the current in amps — the number that decides breaker size, wire, and what can share a circuit.ComparisonHeat Pump or Gas Boiler: the SCOP Your Local Prices DemandBefore any grant, the price of electricity divided by the price of gas sets a seasonal efficiency the heat pump must beat just to break even on running cost. In late 2025 that number was 1.53 in Portugal and 2.79 in Germany — and on old radiators a German heat pump can cost more to run than the boiler it replaced.How-toHow Much Does a Space Heater Cost to Run?Multiply the heater's kilowatts by hours used and your price per kWh — a 1.5 kW heater for 5 hours a day adds up fast at typical tariffs.