Energy and water
Energy and water: 4 free calculators & tools, including Appliance electricity cost and Battery runtime. Explore formulas, examples and visual explanations.
Energy & water
Appliance electricity cost
Total appliance electricity use and cost using power, runtime and duty cycle.
Rainwater collection
Estimate collected rainfall, stored water and overflow for a single rain event.
Solar panel calculator
Estimate solar generation and the number of panels needed for a daily energy target.
