Are the results exact?

Maths calculations are exact. Cost calculations depend on the prices and usage you enter.

Do the date calculators handle leap years?

Yes. They use real calendar dates.

Can I suggest a calculator?

Yes. Use the contact page to request one.

Solar Payback Calculator Australia

Solar Payback Calculator

Estimates how long a rooftop solar system takes to pay for itself.

Your result

Estimate only. Results update as you type.

How this calculator works

Savings = self-used kWh × grid tariff + exported kWh × feed-in tariff. Payback = cost ÷ annual savings.

Worth knowing

Feed-in tariffs have fallen, so using solar power yourself during the day is worth far more than exporting it.

Guides for this calculator

Solar Payback Calculator: Formula, Example and What the Result Means
Solar Payback: What to Check Before You Trust the Number

Questions

Are the results exact?: Maths calculations are exact. Cost calculations depend on the prices and usage you enter.
Do the date calculators handle leap years?: Yes. They use real calendar dates.
Can I suggest a calculator?: Yes. Use the contact page to request one.

This calculator gives general estimates using published Australian rates and formulas. It doesn’t consider your personal circumstances. Check current figures with the ATO, your state government or a qualified professional before making decisions. See our disclaimer.