Electricity Cost Calculator

This electricity cost calculator estimates the cost of running an appliance or device from its wattage, daily usage, and your electricity unit rate.

Electricity cost is based on kilowatt-hours. A 1,000 watt device running for one hour uses 1 kWh. A 100 watt device running for 10 hours also uses 1 kWh.

Use it to compare appliances, estimate the cost of leaving devices on, or understand which items in your home are likely to affect the bill most.

For vehicle charging, use the EV charging cost calculator, which adds distance, miles per kWh, and charging losses to the electricity-rate calculation.

If a 2,000 watt heater runs for 3 hours per day, it uses 6 kWh per day. At £0.28 per kWh, that costs about £1.68 per day, or roughly £50 per month if used daily.

A 10 watt LED bulb running for the same 3 hours uses only 0.03 kWh per day. This is why heating, cooling, drying, and cooking appliances usually matter far more than small electronics.

Focus first on high-wattage devices that run for long periods. Reducing heater, dryer, air conditioner, immersion heater, or tumble dryer use often saves more than unplugging very low-power items.

Use the calculator to compare efficiency upgrades. A more efficient appliance is worth more when it is used often and when your unit rate is high.

Use it when comparing old and new appliances, estimating the cost of a space heater or fan, or checking whether standby devices are worth switching off.

Landlords, housemates, and small businesses can also use it to make energy costs easier to discuss with clear numbers.

Tariffs, standing charges, time-of-use rates, and seasonal usage patterns are not all captured here. Use your bill's unit rate and treat the result as a useful estimate.

For hard-wired or variable-load devices, use an average wattage if the actual draw changes during the cycle.

This page is best for appliances and devices. EV charging has different inputs, so the EV charging cost calculator is the better match for electric car running costs.

Electricity cost depends on kilowatt-hours, so high-watt devices that run for long periods dominate bills more than small standby electronics.

Enter the values you already know, review the headline result, then check the supporting breakdown before sharing the answer with someone else.

If the result will affect money, tax, a formal deadline, or a promise to a client, run a second version with more cautious inputs.

Use it to compare appliances, estimate heater or fan costs, and discuss energy use with housemates or in a small business setting.

A 2,000 watt heater used 3 hours per day at £0.28 per kWh costs far more than a 10 watt LED bulb used for the same time because the heater draws much more power.

Change one input at a time to see whether the answer is sensitive to the percentage, amount, buffer, time zone, or split logic.

The useful output is often the gap between a normal case and a cautious case, not a single optimistic number.

When explaining the result to housemates, colleagues, or clients, show both the inputs and the breakdown so the logic is visible.

Tariffs, standing charges, and time-of-use rates are not all captured here. Use your bill's unit rate and treat the result as a useful estimate.

This tool focuses on one calculation. It does not replace invoices, payroll systems, tax software, calendar scheduling rules, or formal contracts.

For financial, legal, or tax decisions, confirm rates, exemptions, agreements, and timing with the original documents or a qualified professional.

Treat the calculator as a fast planning check that makes assumptions visible before you act.

This page should target electricity cost calculator, appliance running cost, kWh cost calculator, watts to electricity cost, and monthly appliance cost searches.

It estimates daily kWh plus daily, weekly, monthly, and yearly cost from watts, hours per day, and price per kWh. It does not include standing charges, tiered tariffs, time-of-use tariffs, smart-meter history, battery storage, solar export, or variable-load cycle modelling.