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SpecCalc Hub
Free engineering calculators with transparent formulas
Free web calculators for energy, solar, battery runtime, UPS runtime, EV charging cost, voltage drop, wire-size estimates, Ohm's law, voltage divider, and resistor calculations. Each calculator shows formulas, assumptions, limitations, and result logic so users can understand the estimate instead of relying on a black box.
I built SpecCalc Hub because many calculator pages hide the assumptions behind the result. This launch keeps formulas, assumptions, limitations, and estimate-only safety language visible. I would appreciate feedback on formula clarity, UX, missing calculators, and wording of limitations.
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About SpecCalc Hub on Product Hunt
“Free engineering calculators with transparent formulas”
SpecCalc Hub was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #125 on the daily leaderboard. Free web calculators for energy, solar, battery runtime, UPS runtime, EV charging cost, voltage drop, wire-size estimates, Ohm's law, voltage divider, and resistor calculations. Each calculator shows formulas, assumptions, limitations, and result logic so users can understand the estimate instead of relying on a black box.
SpecCalc Hub was featured in Software Engineering (42.6k followers) on Product Hunt. Together, these topics include over 6.8k products, making this a competitive space to launch in.
Who hunted SpecCalc Hub?
SpecCalc Hub was hunted by Temur Khasanov. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Temur Khasanov