Engineering & Technical Calculators
Free technical calculators for mechanical engineering, fluid mechanics, structural analysis, and thermodynamics. Each tool shows the underlying equations and worked examples, making them useful for coursework, design verification, and quick field checks.
Featured Calculators
- flow rate calculator from pipe diameter and velocity
Calculate volumetric flow rate through a pipe using diameter and velocity, or estimate from pressure differential. Supports metric and imperial units.
- moment of inertia calculator for beams and cross-sections
Compute second moment of area for common structural shapes including I-beams, rectangles, and circular sections.
- gear ratio calculator for torque and speed
Calculate gear ratio, output speed, and torque multiplication from driver and driven gear teeth counts.
- pressure calculator from force and area
Calculate pressure, force, or area using P = F/A in metric (Pa, kPa) or imperial (psi) units.
- stress and strain calculator for material properties
Compute stress, strain, and Young's modulus from force, cross-section area, and deformation.
- structural load calculator for distributed beam loads
Analyze distributed and point loads on simply supported beams. Outputs reactions, shear, and moment.
All Engineering & Technical Tools
- Torque Calculator
Calculate torque from force and moment arm, from power and rotational speed, or output torque through a gear stage.
- Pulley System Calculator
Calculate mechanical advantage, effort force, velocity ratio, and efficiency for fixed, movable, block-and-tackle, and compound pulley systems.
- Spring Constant Calculator
Calculate spring constant using Hooke's law.
- Thermal Expansion Calculator
Calculate linear or volumetric thermal expansion for any material — with material presets, reverse-solve mode, and instant unit conversion.
- Heat Transfer Calculator
Calculate heat transfer by conduction (Fourier's law), convection (Newton's law), and radiation (Stefan-Boltzmann). Includes material presets and composite wall option.
- Reynolds Number Calculator
Calculate Reynolds number for flow characterization.
- Pipe Head Loss Calculator
Calculate pipe head loss and pressure drop using the Darcy-Weisbach equation with Colebrook iterative friction factor. Includes major losses (pipe friction), minor losses (fittings K-factors), Reynolds number, flow regime, and pump head requirement.
- Beam Deflection Calculator
Maximum deflection and bending moment for simply supported, cantilever, and fixed-fixed beams under a point load or a uniform load, with L/360 and L/240 checks.
- Shaft Torsion Calculator
Torsional shear stress, angle of twist, and polar moment J for solid and hollow circular shafts, from torque or from power and rpm, with an allowable-stress sizing check.
- Mass Moment of Inertia Calculator
Mass moment of inertia of common solids, the parallel axis theorem, flywheel rotational kinetic energy, and the torque needed for a given angular acceleration.
- Column Buckling Calculator
Euler critical buckling load and stress for columns with pinned, fixed, or free ends, with slenderness ratio and a warning when Euler theory does not apply.
- Mass Flow Rate Calculator
Mass flow rate from density and volumetric flow, or from pipe diameter and velocity, with fluid presets and results in kg/s, kg/h, and lb/hr.
- Orifice Flow Calculator
Flow through an orifice plate or nozzle from differential pressure, orifice and pipe diameter, and discharge coefficient, or the pressure drop for a known flow.
- Pump Power Calculator
Pump hydraulic power, shaft power, and an indicative motor size from flow rate, total head or pressure rise, fluid density, and efficiency.
- Bernoulli Equation Calculator
Solve Bernoulli's equation between two points for an unknown pressure, velocity, or elevation, with continuity for diameter changes and optional head loss.