Mechanical Engineering Calculators
17 mechanical calculators in the Engineering Database. Each tool runs deterministic calculations against authoritative reference tables, so results trace back to source standards.
Boiler Selection & Efficiency Calculator
Selects a boiler for a given heating load and calculates fuel input rate, annual operating cost, altitude derating, and redundancy configuration. Supports condensing gas, electric resistance, firetube (gas/oil), and watertube (gas/oil) boiler types.
Free with sign-inCooling Tower Selection & Sizing
Sizes cooling towers for datacenter or HVAC condenser water systems. Calculates water balance (evaporation, blowdown, drift, makeup), determines number of cells, fan power, and Merkel number (KaV/L) using the Chebyshev four-point approximation.
Paid tierDatacenter Cooling Unit Selection
Selects cooling units for datacenter IT loads. Looks up ASHRAE thermal guidelines for the specified class, calculates required airflow, selects units from the cooling-specs table by cooling type and sensible capacity, applies redundancy, and computes partial PUE contribution from cooling.
Paid tierHeat Exchanger Sizing
Sizes a heat exchanger using LMTD or NTU-effectiveness method. Pulls fluid properties (cp, density, viscosity) from reference tables at operating temperatures. Estimates overall U from Perry's Table 11-3 fluid-pair data and fouling factors from TEMA RGP-T-2.
Free to useHelical Compression Spring Design
Designs and analyzes helical compression springs. Calculates spring rate, stress, safety factor, solid length, natural frequency, and buckling risk. Looks up wire material properties for allowable stress.
Free with sign-inHVAC Cooling Load Estimation
Estimates building cooling loads using a simplified ASHRAE method. Calculates envelope conduction (walls, windows, roof), solar gain, internal loads (people, lighting, equipment), and ventilation loads. Returns sensible/latent breakdown, total tonnage, and SHR.
Free with sign-inHVAC Duct Sizing Calculator
Sizes round and rectangular HVAC ducts using equal friction, velocity reduction, or static regain methods. Calculates friction and fitting losses, total pressure drop, and flags noise concerns. Looks up fitting loss coefficients from ASHRAE reference data.
Free to useImmersion Cooling Fluid Selector & Thermal Calculator
Selects and ranks immersion cooling fluids for datacenter IT loads. Supports single-phase (pumped) and two-phase (evaporative) modes. Calculates required flow rates, evaporation rates, tank fill mass, and filters by GWP and thermal suitability.
Paid tierO-Ring Groove Design (AS568B)
Selects an O-ring by AS568B dash number and calculates groove dimensions for static or dynamic seals. Determines groove depth, width, squeeze %, stretch %, volume fill %, backup ring requirement, and surface finish per AS568B and standard gland design practice.
Paid tierPipe Sizing & Pressure Drop
Selects pipe size and calculates pressure drop for a given fluid, flow rate, and pipe material. Supports Darcy-Weisbach and Hazen-Williams methods. Pulls real fluid properties, pipe dimensions, friction factors, and fitting loss coefficients from reference tables.
Free to usePipe Support Span Calculator
Determines maximum pipe support spacing per MSS SP-69, calculates pipe weight, contents weight, and insulation weight per linear foot. Optionally computes number of supports for a given pipe run length and flags high-temperature spring hanger guidance.
Free with sign-inPressure Vessel Shell Thickness (ASME VIII Div.1)
Calculates minimum required wall thickness for pressure vessel components per ASME VIII Division 1, UG-27 (shells) and UG-32 (heads). Looks up allowable stress at design temperature, applies corrosion allowance, and optionally computes MAWP from actual thickness.
Free with sign-inPump System Curve & Selection
Calculates system head curve for a piping system and finds the operating point on pump performance curves. Returns recommended pump family, operating flow/head, efficiency, BHP, NPSHr, and required motor HP.
Free to useShaft & Bearing Design
Calculates bearing life per ISO 281 and minimum shaft diameter. Looks up bearing specs (dynamic/static load ratings, speed limits), computes L10 and adjusted life, static safety factor, and shaft diameter from combined bending and torsion loads.
Free with sign-inSpur Gear Design (AGMA)
Designs spur gear pairs per AGMA standards. Calculates tooth geometry, pitch diameters, tangential forces, Lewis bending stress, AGMA contact stress, gear ratio, and pitch line velocity. Supports metric (module) or imperial (diametral pitch) input.
Free with sign-inThermal Resistance Network
Calculates heat transfer through multi-layer flat walls or cylindrical pipes using thermal resistance networks. Looks up thermal conductivity for each layer from reference tables. Computes individual and total thermal resistances, steady-state heat flow rate Q, overall heat transfer coefficient U, and interface temperatures at each boundary.
Free with sign-inVentilation Rate Calculator (ASHRAE 62.1)
Calculates required outdoor air ventilation rates per ASHRAE 62.1 Ventilation Rate Procedure. Looks up per-person (Rp) and per-area (Ra) rates by occupancy category and calculates total outdoor air CFM.
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