42 free tools — no signup required

Free Energy Calculators & Converters

Convert energy units, calculate costs, and understand power consumption — all free.

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Understand your electricity costs

Estimate your bill, identify costly appliances, price an EV charge, and size a solar system against your energy use.

kWh Cost Calculator

Estimate electricity charges from usage, price per kWh and fixed fees, or calculate one appliance from watts.

Appliance Energy Hog Detector

Compare appliances using their power, runtime and your electricity rate.

EV Charging Cost Calculator

Estimate charging cost using your battery, charging losses and electricity price.

Solar Sizing Calculator

Estimate the solar capacity needed to offset your household electricity use.

Solar Panel Output Calculator

Estimate solar generation from panel capacity, sun hours and system losses.

Tool Categories

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Energy Conversion

Convert between energy units and calculate costs

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Energy Conversion

Convert between energy units like calories, joules, and BTU

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Energy Physics

Kinetic energy, potential energy, and power calculations

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Why Use Energy Toolset?

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Frequently Asked Questions

Common questions about the Energy Toolset

Yes — all tools and calculators are completely free, with no subscriptions or account sign-ups required.