kWh Cost Calculator

Calculate electricity cost from kWh, cost per kWh, appliance watts, daily runtime, fixed fees, and billing period.

Last updatedHow we build & check our tools

Interactive Calculator

Use this calculator to analyze your finances and make informed decisions.

Enter your values below to see personalized results.

Sources & References

International System of Units (SI): energy, work and heat

Energy, work and heat is measured in the joule (J); 1 cal = 4.184 J. Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.
→Source: NIST — International System of Units (SI)

International System of Units (SI)

Authoritative definitions for energy, work and heat, from the BIPM SI Brochure (9th edition), the defining reference for the SI.
→Source: BIPM — SI Brochure (9th ed.)

Explore More Tools

Continue your financial journey with these related calculators

energy

Solar Panel ROI Calculator

Enter what a solar installation costs and how much it should cut your monthly electric bill to see the payback period and net savings over 25 years. The federal 30% residential clean energy credit is applied only to systems placed in service in 2025 or earlier.

Try it now
energy

EV Charging Cost Calculator

Calculate the cost of charging an electric vehicle based on distance and electricity rates.

Try it now
energy

Solar Revenue Calculator

Multiply system size in kW by annual peak sun hours to estimate yearly production, then by your feed-in tariff or electricity rate to estimate revenue and the years needed to recover the installation cost.

Try it now
energy

Solar Sizing Calculator

Calculate the optimal solar panel size for your home or business based on energy consumption and sunlight availability.

Try it now
energy

Heating Load Calculator (Design Heat Loss)

Estimate a building's design heat loss in watts and kilowatts from floor area, ceiling height, U-values for walls, roof, windows and floor, window share, air changes per hour and indoor and outdoor design temperatures.

Try it now
energy

Solar Proposal Risk Checker

Solar Proposal Risk Checker helps review energy and utilities inputs locally with private local analysis, browser-side previews, and optional cached model upgrades.

Try it now