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Capacitor Series / Parallel / Reactance Calculator — Field Guide
Combine capacitors, compute reactance, and read the RC time constant off a single result card…
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VAT, GST, Sales Tax: The Calculator That Knows Which Number Is the Price
European VAT, Australian GST, and U.S. sales tax use the same five operations. The conventions are different. A working VAT calculator has to commit to inclusive or exclusive, round at the basket, and keep per-line data for the regulator.
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Mulch Calculator: The Cubic-Yard Mistake That Turns One Bag Into Three
A practical guide to estimating mulch, gravel, topsoil, sand, and compost by depth, density, weight, bulk bags, small bags, allowance, and cost.