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HowMuchWatts
50 free calculators for home energy costs & savings
11 followers
50 free calculators for home energy costs & savings
11 followers
HowMuchWatts is a free suite of 50+ home energy calculators — no signup, no fluff. Work out solar payback, heat pump savings, EV charging costs, and what any appliance costs to run. Every calculator shows its formula and updates as you type. Plus an appliance power-consumption reference chart and plain-English guides.
How do you keep the formulas and efficiency numbers up to date when utility rates and panel prices keep shifting every quarter?
@pnar1086289 Right now formulas are reviewed manually every quarter against EIA rate data and NREL/manufacturer specs for panel pricing. Not automated yet - that's the next build (auto-pull from public rate APIs) so it's less manual on my end and more current for you.
Showing the formula right next to each result is a quietly brilliant move, makes it feel honest instead of magic. Love that you didn't bury the math behind a paywall or signup.
@nuranasilsoy That was the whole point - most tools give you a number and ask you to trust it. Showing the formula means you can check my math, not just take my word for it. hope it hleps