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Lighting Cost Calculator
Compare old bulbs with LEDs including replacements.
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Battery storage calculators
Battery sizing, backup runtime, payback, plus solar, rates, circuits, and load, each with visible math.
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HVAC Running Cost Calculator
Estimate heating and cooling cost for any period.
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Commercial Electricity Cost Calculator
Split a commercial bill into energy, demand, and fees.
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Time-of-Use Rate Plan Comparison
Test whether a time-of-use plan beats your flat rate.
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EV Charging Cost Calculator
Compare home and public EV charging against gasoline.
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Solar System Size Calculator
Size a solar array from your usage and sun hours.
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Solar Panel Payback Calculator
Estimate solar savings, payback, and 25-year net benefit.
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Appliance Energy Cost Calculator
Find which appliance costs you the most to run.
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Watts to Amps Converter
Convert watts to amps at 120/240V with power factor.
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Electricity Bill Estimator
Estimate your monthly and annual electric bill from usage and rate.
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