Engineering Calculators
Run formula-backed engineering checks for fluid flow, mechanics of materials, and simple beam response. Each calculator shows normalized SI values, conversion rows, and a visible scope note so simplified assumptions are not hidden.
Live today
Reynolds Number Calculator
Calculate Reynolds number from density, velocity, characteristic length, and viscosity with simplified pipe-flow regime notes.
Stress and Strain Calculator
Calculate axial stress, strain, microstrain, percent strain, and implied Young's modulus from force and elongation.
Beam Load Calculator
Estimate simple beam deflection, maximum moment, and shear for center point load or uniform load cases.
Calculators released for Day 21
Fluids
Reynolds Number Calculator
Calculate Reynolds number from density, velocity, characteristic length, and viscosity with simplified pipe-flow regime notes.
Use calculatorMechanics
Stress and Strain Calculator
Calculate axial stress, strain, microstrain, percent strain, and implied Young's modulus from force and elongation.
Use calculatorStructures
Beam Load Calculator
Estimate simple beam deflection, maximum moment, and shear for center point load or uniform load cases.
Use calculatorCore formulas and when to use them
| Topic | Formula | Use |
|---|---|---|
| Reynolds number | Re = rho V L / mu | Compare inertial and viscous effects in a flow after converting to SI units. |
| Axial stress and strain | sigma = F / A; epsilon = delta L / L0 | Turn force, area, and elongation measurements into basic mechanics quantities. |
| Center point beam load | delta = P L^3 / (48 E I) | Estimate midspan deflection for a simply supported beam with a center point load. |
| Uniform beam load | delta = 5 w L^4 / (384 E I) | Estimate midspan deflection for a simply supported beam with full-span uniform load. |
Document assumptions before using simplified results
Engineering Notes on Graph Paper Guide
Build engineering calculation notes with a known-values block, unit conversion row, formula substitution, diagram space, assumptions, and source references.
External references used for formulas and units
Simplified calculators, not final engineering approval
Toolarithm's engineering calculators are designed for formula transparency. They normalize inputs, show conversion rows, and repeat assumptions because engineering formulas can be dangerous when copied outside their model limits.
These pages support education, preliminary screening, and documented calculations. They do not replace professional engineering review, applicable codes, safety factors, testing, inspection, or project-specific design responsibility.