Nine interactive calculators covering the formulas that show up year after year in GATE Chemical Engineering, each one solves instantly and shows every step, not just the final number.
GATE Chemical Engineering rewards students who can move fast and check their work. The nine calculators on this page cover formulas that appear almost every year, vapor pressure and dew point via the Antoine equation, heat exchanger sizing via LMTD and area, flow regime classification via the Reynolds number, pipe friction via the friction factor and pressure drop, pump cavitation checks via NPSH and power sizing, and moist-air properties via the psychrometric calculator. Each one requires no signup and works on mobile.
A calculator alone doesn't teach you anything, the value is in seeing the full derivation every time you use one. That's why each calculator on ChemeGate shows every intermediate step, not just the final answer, so you can check exactly where your own hand calculation diverges when practicing past papers.
The most effective way to use these tools during GATE prep is backwards: solve a previous year question by hand first, then use the matching calculator to verify your answer and catch sign errors, unit mismatches, or a misremembered formula before they cost you marks on exam day. Each calculator page includes at least one solved GATE previous year question worked this way, see the full GATE ChemE previous year questions collection for more.
Solve vapor pressure P* and dew point temperature from log₁₀(P*) = A − B/(C+T), with Antoine constants for Benzene and Water and a full step-by-step solution, including the GATE 2025 Q47 dew point problem.
Open calculator →Heat TransferCalculate the Log Mean Temperature Difference for counter-current or co-current heat exchangers, then compute the required heat transfer area A = Q/(U×LMTD), the same calculation as GATE 2025 Q51.
Open calculator →Fluid MechanicsDetermine Re = ρvD/μ from fluid density, velocity, pipe diameter, and viscosity, and instantly see whether the flow is laminar, transitional, or turbulent, as tested in GATE 2025 Q43.
Open calculator →Fluid MechanicsCompute the Darcy friction factor for laminar flow (64/Re) or turbulent flow via the Colebrook equation and the explicit Swamee-Jain approximation, side by side.
Open calculator →Fluid MechanicsCalculate Net Positive Suction Head available for a pump installation, with a built-in cavitation check against the pump's required NPSH.
Open calculator →Mass TransferCompute humidity ratio, relative humidity, and wet-bulb relationships for moist air, built on the same water Antoine equation used elsewhere on this site.
Open calculator →Fluid MechanicsCompute hydraulic power (ρgQH) and brake power for motor sizing, from flow rate, head, fluid density, and pump efficiency.
Open calculator →Heat TransferSize a heat exchanger with A = Q/(U×LMTD), feed in the LMTD from the LMTD calculator, plus heat duty and overall U.
Open calculator →Fluid MechanicsCompute frictional pressure drop via Darcy-Weisbach, with the Reynolds number and friction factor calculated automatically.
Open calculator →Beyond these nine tools, ChemeGate also has 16 topic guides covering weightage, essential formulas, derivations, worked problems, and study order across the entire GATE CH syllabus, plus full-length year-wise practice tests (2024–2026) with a 180-minute timer and instant scoring. No login wall required.
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Calculate P* = 10^(A − B/(C+T)) for Benzene and Water. Includes GATE 2025 Q47 dew point solution.
Log Mean Temperature Difference for counter/co-current flow. Compute heat transfer area A = Q/(U·LMTD).
Determine flow regime (laminar / transitional / turbulent) from fluid properties and pipe geometry.
Darcy friction factor via 64/Re (laminar) or Colebrook/Swamee-Jain (turbulent), with full step-by-step solutions.
Net Positive Suction Head available (NPSHa), with a cavitation check against your pump's required NPSH.
Compute humidity, relative humidity, and related psychrometric properties from dry-bulb temperature.
Compute hydraulic power (ρgQH) and brake power for motor sizing, with full step-by-step solutions.
Size a heat exchanger with A = Q/(U×LMTD), with full step-by-step solutions.
Frictional pressure drop from pipe and fluid data via Darcy-Weisbach, with automatic friction factor.