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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.
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.
On the analytics side, SpecCalc Hub competes within Software Engineering — topics that collectively have 42.6k followers on Product Hunt. The dashboard above tracks how SpecCalc Hub performed against the three products that launched closest to it on the same day.
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.
For a complete overview of SpecCalc Hub including community comment highlights and product details, visit the product overview.
Temur Khasanov