Launched this week

HowMuchWatts

Launched this week

50 free calculators for home energy costs & savings

10 followers

50 free calculators for home energy costs & savings

10 followers

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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.

Free

Launch tags:Home•Climate Tech•Tech

Launch Team

Marked 3Writing to LLMs, Marked is the ultimate Markdown preview.

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Maker

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Hi everyone. I built HowMuchWatts because every "energy cost" calculator online was either oversimplified or buried in ads and signup walls. So I made 50 clean ones that just answer the question - solar payback, heat pumps, EV charging, appliance running costs - and show the exact formula so you can trust the number. Which calculator would you actually use, and what's missing? Everything's free and embeddable if you run a blog. Thanks for looking!

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2d ago

How do you keep the formulas and efficiency numbers up to date when utility rates and panel prices keep shifting every quarter?

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1d ago

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.

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1d ago