WhatEquation?

Stop digging through handbooks and search results. WhatEquation? finds the right engineering equation from a plain-English description of your problem. Type something like "pressure drop in rough pipe", "will this block of wood float" or "how many kVA is a 50 kW load" and get ranked equations, each with the formula, what every variable means, units, and when the equation is valid. WHAT'S INSIDE - 259 equations across 12 areas: fluids, heat transfer, thermodynamics, mass transfer, reaction engineering, process control, mechanics and materials, electrical, engineering economics, environment and safety, math and physics - 190 constants: gas constants in 7 unit sets, pipe roughness, water properties by temperature, common fluids, materials, insulation, emissivity, typical h and U values, molar masses and fuels - 205 unit conversions: pressure, flow, energy, power, torque, velocity, concentration and more, with a tap to copy BUILT FOR REAL WORK - Natural-language search that understands what you mean, not just exact names - Quick Browse: tap a category to see every equation in it, A to Z - Search the constants and conversions the same way, for example "psi to kpa" - Clear formula display with proper subscripts and exponents - Each equation shows its variables, units and assumptions PRIVATE AND OFFLINE - Works with no internet connection - No account, no ads, no tracking - Nothing you search or view is collected or sent anywhere Built by an engineer for engineers, students and anyone who needs the right equation without the hunt. Great for FE and PE exam prep, coursework, plant and design work, and quick sanity checks. WhatEquation? is a reference aid only. Always verify results against your handbook, code or governing standard before relying on them. It does not replace professional engineering judgment. Found an error or want an equation added? Use the link at the bottom of any equation screen, or visit shattochem.com/support.html.