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kWh to Running Cost Calculator

Convert electricity consumption in kWh into a running cost at a typical unit rate.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Running cost at 0.25/kWh

25 cost units

High confidence

Applies a nominal unit rate of 0.25 per kWh — scale the result to your own tariff. Scale the result by your own unit rate — the 0.25 figure is a placeholder, not a market price.

Conversion factor applied
0.25 cost units per kWh

Comparing the running cost of heating options, or justifying an efficiency measure, starts with turning consumption into money. The arithmetic is a single multiplication, and the honest difficulty is that there is no universal unit rate: tariffs differ by market, supplier and time of use, and increasingly within a single day. This applies a round placeholder so the relationship is visible, and the result scales directly, so applying your own rate is a matter of proportion. Two things to keep out of the calculation: standing charges, which are payable whatever you use, and clock hours for anything that cycles — a fridge or heat pump runs a fraction of the time it is switched on.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Running cost is the product of energy consumed in kilowatt-hours and the unit rate charged per kilowatt-hour
  • Unit rates are set per supplier and per tariff and are not standardised; several markets now vary them by time of day. Take the figure from your own bill.

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why a nominal rate rather than a real one?
Because unit rates differ by country, supplier, tariff and increasingly by time of day, and a hard-coded figure would be wrong for nearly everyone. The result scales linearly, so multiplying by the ratio of your rate to 0.25 gives your actual cost.
Does standing charge come into this?
No. This is the marginal cost of the energy used. A standing charge is payable regardless of consumption, so it does not belong in a calculation of what running a particular appliance costs.
How do I work out an appliance's kWh?
Multiply its power in kilowatts by the hours it runs. A 2 kW heater for three hours is 6 kWh. For appliances that cycle, such as fridges and heat pumps, running hours are far less than clock hours and a meter reading is more reliable than arithmetic.