Calculators
Calculate your energy
Everything runs in your browser, nothing is sent anywhere. Results are estimates; adjust prices to your own tariff.
Appliance consumption
What eats the most at home and what it costs. The fridge is usually innocent, the dryer rarely.
Solar payback
How many years until the roof pays for itself, with and without subsidy. No marketing, just numbers.
Heat pump vs. gas
Yearly heating cost of both options and the payback of the investment.