Calculators
Free energy calculators
Work out what your appliances cost to run, what solar could save, and how long backup power will last — in pesos, with every assumption visible and editable.
- Your numbers, not ours. Every rate and assumption can be changed.
- Private. Calculations run in your browser. Nothing is sent to us.
- Transparent. Formulas and limitations are shown on every page.
Electricity and appliances
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Electricity Cost Calculator
Work out the kWh and peso cost of one appliance or several, per day, month and year.
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Household Appliance Consumption Calculator
List every appliance at home, find the biggest users, see the cost breakdown and export a CSV report.
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Aircon Electricity Cost Calculator
Estimate monthly aircon kWh and cost from rated or measured power, and compare scenarios side by side.
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Solar
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Solar System Size Calculator
Work out the solar system size (kWp), number of panels, roof area and optional battery your home needs, from your monthly kWh or bill.
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Solar Savings Calculator
Estimate solar generation, self-consumption, exports, bill savings and simple payback for your home.
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Solar Payback Calculator
Project cumulative cash flow and breakeven year for up to three solar proposals, with degradation and replacements.
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Backup power
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Which EcoFlow Should I Buy? Quiz
Tick the appliances you want to run in a brownout and get matched to EcoFlow power stations with enough power and capacity.
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Power Station Runtime Calculator
Estimate how long a portable power station or battery can run your devices during a brownout.
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EcoFlow Runtime Calculator
Pick an EcoFlow model and your devices to estimate how many hours it can keep them running.
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How accurate are these calculators?
They are as accurate as the numbers you put in. The maths is simple and shown on each page; the uncertainty is in the inputs — how many hours you really use an appliance, how much power it really draws, and what your rate will be next month. Read our calculation methodology for the formulas, default assumptions and their sources.