Energy

Estimate daily and yearly solar kWh from system size and regional peak sun hours — Germany, India, Japan, US, Australia defaults you can override.

• Solar electricity calculatorSystem kW × peak sun hours × performance ratio for daily and yearly kWh. Swap the region to change default sun hours.
• Fuel consumption & trip cost calculatorConvert petrol or diesel efficiency units, enter price per litre or gallon, and get cost per distance plus trip fuel and cost.
• EV efficiency & consumption calculatorConvert any EV efficiency unit via Wh/km, read the arithmetic, then price a trip from electricity cost and optional battery size.
• EV vs gasoline cost comparisonTwo columns — petrol car and EV — then a trip or monthly distance. See which costs less per 100 km and how much you save (or spend extra).