Solar Energy Calculators
Last updated: October 2026
Solar Savings Calculator
Calculate monthly bill savings from a solar PV system by multiplying solar production by your electricity rate.
Solar Panel Angle Calculator
Find the ideal tilt angle for your solar panels based on your latitude, season, and roof pitch.
Net Metering Calculator
Estimate your monthly electric bill or credit with solar under time-of-use net metering: peak and off-peak rates, when you produce and use power, export credit and fees.
Solar System Sizing Calculator
Calculate the solar array size in kilowatts needed to cover a chosen percentage of your electricity usage.
Solar Carbon Offset Calculator
Estimates the annual CO2 emissions avoided by your solar PV system, using your yearly production in kWh and the grid emission factor it displaces.
Solar Inverter Sizing Calculator
Determines the right inverter size for a solar array by factoring in panel capacity, orientation, climate, and DC:AC ratio.
Solar Panel System Size Calculator
Determine how many kilowatts of solar panels you need to meet a chosen percentage of your electricity bill.
Solar Financing Calculator
Estimate the monthly payment and total interest on a solar panel loan from the system cost, down payment, rate and term, and compare it with your electric bill.