Free Engineering & Statistics Calculators

Quick, accurate calculators with formulas, worked examples and reference tables. Pick a tool:

Watts to Amps CalculatorConvert watts to amps for DC, AC single-phase and three-phase circuits with power factor. Presets for 12, 120, 208, 240 and 480 V, plus 80% breaker sizing info.Amps to Watts CalculatorConvert amps to watts for DC, AC single-phase and three-phase (line-to-line or line-to-neutral) with power factor. Voltage presets and reference table included.Z-Score CalculatorCalculate a z-score from x, mean and standard deviation, then get the percentile and one- or two-tailed p-value from an accurate normal CDF. Also find x from z or z from a probability.lbf to N ConverterConvert pound-force (lbf) to newtons (N) and back, plus kilonewtons, kip and kilogram-force. 1 lbf = 4.44822 N. Live converter, formula, worked example and conversion tables.y+ CalculatorEstimate CFD first cell height (wall spacing) for a target y+ from velocity, density, viscosity and reference length. Uses the Schlichting flat-plate skin friction correlation, with air and water presets.K-Factor CalculatorSheet metal K-factor calculator: find bend allowance and bend deduction from K, thickness, inside radius and angle, or back-calculate K from a measured bend allowance or deduction.K-Map SolverFree Karnaugh map solver for 2, 3 and 4 variables. Click cells to set 0, 1 or don’t-care (X) and get the minimal sum-of-products via Quine-McCluskey, with every group shown.Microwave Wattage ConverterConvert microwave cooking times between wattages (700, 800, 900, 1000, 1100, 1200 W). Time = t1 × W1 / W2. Instant calculator plus a quick conversion chart.

Why QuickEngCalc?

Every calculator runs instantly in your browser — no sign-up, no ads in the way, nothing sent to a server. Each page shows the exact formula, a worked example you can check by hand, and a reference table, so you can trust and cite the result. The math is covered by automated unit tests against published reference values.

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