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.