Solar Calculators

Browse free solar calculators for solar panel sizing, system size, solar output, savings, ROI, payback period, installation costs, batteries, off-grid solar, inverter sizing, charge controllers, panel tilt, net metering, and more.

Popular solar calculators

Start with the solar calculators homeowners, DIY solar users, and energy planners search for most.

Solar Panel Calculator

Estimate solar panel needs, system size, and basic solar project requirements.

How Many Solar Panels Do I Need?

Calculate panel count from electricity use, panel wattage, and sun hours.

Solar Savings Calculator

Estimate monthly and yearly savings from switching to solar power.

Solar Battery Size Calculator

Estimate battery capacity needed for backup power or off-grid use.

Browse solar calculators by type

Solar Panel & System Sizing

Tools for estimating solar panel count, solar system size, panel output, and solar energy production.

Solar Panel Calculator Solar System Size Calculator How Many Solar Panels Do I Need Calculator Solar Panel Output Calculator Solar kWh Calculator

Solar Savings & Payback

Estimate solar savings, return on investment, payback period, and break-even timing.

Solar Savings Calculator Solar ROI Calculator Solar Payback Period Calculator Solar Break Even Calculator

Solar Cost & Financing

Estimate installation costs, tax credits, incentives, solar loans, and lease versus buy options.

Solar Installation Cost Calculator Solar Tax Credit Calculator Solar Incentive Calculator Solar Loan Calculator Solar Lease vs Buy Calculator

Solar Battery & Backup

Plan battery size, backup power, runtime, battery costs, and solar plus battery savings.

Solar Battery Size Calculator Solar Battery Backup Calculator Solar Battery Runtime Calculator Solar Battery Cost Calculator Solar Plus Battery Savings Calculator

Off-Grid Solar

Estimate off-grid solar needs for cabins, RVs, sheds, remote buildings, workshops, and backup setups.

Off Grid Solar Calculator

Solar Equipment & Placement

Calculate inverter size, charge controller size, panel angle, tilt angle, and net metering value.

Solar Inverter Size Calculator Solar Charge Controller Calculator Solar Panel Angle Calculator Solar Panel Tilt Calculator Solar Net Metering Calculator

About these solar calculators

These solar calculators are designed for fast estimating, planning, and educational use. They can help with common solar project calculations such as solar panel count, system size, solar output, electricity savings, ROI, payback period, installation costs, solar battery sizing, off-grid planning, inverter sizing, charge controller sizing, and panel placement.

Important solar planning note

Solar results can vary by location, roof direction, shading, panel efficiency, utility rates, battery type, system losses, installation costs, incentives, and local net metering rules. Use these tools as planning estimates and verify important solar, electrical, financial, and permitting decisions with qualified professionals when needed.

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