About These Calculators
Energy calculators to help you understand your power consumption, plan solar installations, size battery banks, and estimate electricity costs.
Energy Calculators
3 toolsSolar Panel Calculator
Estimate panels, system size, cost, and payback period
Battery Bank Calculator
Size your off-grid battery bank by daily load, voltage, and days of autonomy
Electricity Cost Calculator
Calculate how much your appliances cost to run
Frequently Asked Questions
Are these energy calculators free?
Yes, all 3 calculators are completely free with no signup required. They run entirely in your browser — no data is sent to any server.
How accurate are these calculators?
Our calculators use industry-standard formulas and are regularly updated. However, they provide estimates — always verify critical calculations with a professional in the relevant field.
Can I use these calculators on my phone?
Yes, all calculators are mobile-responsive and work on any device with a web browser. No app download needed.
Do you save my calculations?
No. All calculations happen in your browser. We don't store any of your inputs or results. Your data stays on your device.
Can I embed these calculators on my website?
Select calculators offer embed codes that you can copy and paste into your website or blog. Look for the "Embed This Calculator" section on individual tool pages.