Engineering
Stress Calculator
Mechanical stress from force and cross-sectional area (σ = F/A), in Pa, MPa and psi.
σ = F / A
Also called tensile stress · sigma calculator
Engineering · 10 calculators
Engineering Calculators
Stress, strain, safety factor, efficiency, torque, power, electrical load, pressure and material weight.
Engineering
Strain Calculator
Strain from length change, and the stress it implies through Young’s modulus.
ε = ΔL / L₀
Also called youngs modulus calculator · elongation calculator
Engineering
Safety Factor Calculator
Factor of safety from strength and applied stress, or the allowable load for a chosen factor.
FoS = material strength ÷ applied stress
Also called factor of safety · fos calculator
Engineering
Efficiency Calculator
Efficiency as output ÷ input × 100 — for machines, energy conversion, processes or work.
Efficiency = Useful output ÷ Total input …
Also called efficiency formula · machine efficiency
Engineering
Torque Calculator
Torque from force and lever arm (τ = F·r), solving for any variable, in N·m and lb·ft.
τ = F × r × sin θ (θ = 90° for maximum to…
Also called torque formula · moment of force
Engineering
Power Calculator
Power as work done per unit time (P = W/t) — solve for power, work or time, in watts and horsepower.
P = W / t
Also called power formula physics · watts from work
Engineering
Electrical Load Calculator
Total connected load, demand load and current draw for a panel or circuit.
Demand = connected load × demand factor +…
Also called panel load calculator · connected load
Engineering
Pressure Calculator
Pressure from force and area (P = F/A) or fluid depth (P = ρgh), in Pa, bar, psi and atm.
P = F / A
Also called pressure formula · p = f/a
Engineering
Material Weight Calculator
Weight of a bar, plate, tube or block from its dimensions and material density.
weight = volume × density
Also called steel weight calculator · metal weight
Engineering
Unit Converter
Convert any unit — length, weight, volume, area, temperature, speed, pressure, energy, power, time, angle and data — in one place.
value → base unit → target unit
Also called all unit converter · measurement converter
Key engineering formulas
| Stress | σ = F / A |
|---|---|
| Strain | ε = ΔL / L₀ · σ = E × ε |
| Safety Factor | FoS = material strength ÷ applied stress |
| Efficiency | Efficiency = Useful output ÷ Total input × 100 |
| Torque | τ = F × r × sin θ (θ = 90° for maximum torque) |
| Power | P = W / t |
| Electrical Load | Demand = connected load × demand factor + 25% of the largest motor |
| Pressure | P = F / A · P = ρgh |
| Material Weight | weight = volume × density |
| Unit Converter | value → base unit → target unit |
Engineering questions
What is the difference between stress and pressure?
They have the same units. Pressure acts on a fluid boundary from outside; stress is the internal force distribution inside a solid.
Are the conversion factors exact?
Yes where an exact definition exists: 1 in = 25.4 mm, 1 lb = 0.45359237 kg, 1 mi = 1609.344 m. The rest use the current internationally accepted values.