Energy & Solar Calculators

Estimate solar system size from monthly usage, sun hours, and system efficiency.

Calculate solar ROI from installation cost, yearly savings, incentives, and maintenance.

Estimate solar payback period from net system cost and yearly savings.

Calculate appliance energy use and cost from wattage, hours, days, and rate.

Calculate kilowatt-hours from watts and runtime.

Estimate generator fuel use and cost from load, runtime, and fuel rate.

Estimate electricity bill with usage tiers, fixed fees, and tax.

Calculate voltage, current, resistance, and power from Ohm's law relationships.

Calculate electrical power from voltage and current.

Calculate mechanical stress from force and cross-sectional area.

Calculate strain from change in length and original length.

Calculate volumetric flow rate from area and velocity.

Estimate electricity cost from wattage, usage time, and price per kWh.