Nine calculators covering the formulas that show up year after year in GATE Chemical Engineering, grouped by area.
Every calculator on ChemeGate solves a formula that shows up almost every year on the GATE Chemical Engineering paper, and every one of them shows the full step-by-step solution, not just a final number, so you can check exactly where a hand calculation diverges. They're grouped here into three areas: Fluids (, Darcy friction factor, pipe pressure drop, pump NPSH, and pump power, all built around flow in a pipe), Heat (LMTD-based heat exchanger sizing and area calculation), and Thermo & Air (the Antoine equation for vapor pressure, and the psychrometric calculator that reuses it for moist-air properties).
The most effective way to use these during GATE prep is backwards: solve a previous year question by hand first, then use the matching calculator to catch sign errors, unit mismatches, or a misremembered formula before they cost marks on exam day. Each calculator page also links back to its parent topic guide, so if a formula feels unfamiliar you can jump straight to the derivation and worked examples behind it.
Looking for a single quick-reference sheet instead? See the GATE CH Formula Sheet, or read the full GATE Chemical Engineering Calculators guide for more context on each tool.
Determine flow regime (laminar / transitional / turbulent) from fluid properties and pipe geometry.
Colebrook · Swamee-JainDarcy friction factor via 64/Re (laminar) or Colebrook/Swamee-Jain (turbulent), with full step-by-step solutions.
Cavitation CheckNet Positive Suction Head available (NPSHa), with a cavitation check against your pump's required NPSH.
Motor SizingCompute hydraulic power (ρgQH) and brake power for motor sizing, with full step-by-step solutions.
Darcy-WeisbachFrictional pressure drop from pipe and fluid data via Darcy-Weisbach, with automatic friction factor.