General Engineering Calculators
Motor horsepower, torque, and a comprehensive unit converter covering length, area, volume, mass, force, pressure, energy, temperature and more. All browser-based, no signup required.
P (kW) = T × N × 2π / 60HP = P (kW) / 0.746Include safety factor for actual motor selection.
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About Torque Calculator
Torque is the rotational force applied to an object. T = F × r, where F is force (N) and r is the moment arm (m). In rotating machinery: T = P × 60 / (2π × N) = 9550 × P(kW) / N(RPM). Understanding torque is essential for selecting couplings, gearboxes, fasteners, and shaft designs.
For bolt tightening: torque specifications prevent both under-tightening (joint loosening) and over-tightening (thread stripping). Typical torque for M10 Grade 8.8 bolt: ~47 Nm; M16: ~154 Nm. In vehicle engineering, peak torque determines pulling power and acceleration. High torque at low RPM (diesel engines) is better for towing; high power at high RPM (petrol/electric) is better for top speed. Use this calculator for shaft design, gearbox selection, fastener specifications, and motor-drive system analysis.
Enter any two values to find the third:
τ = F × r × sin(θ)About Engineering Unit Converter
This converter handles the most common engineering unit conversions across pressure, stress, force, energy, temperature, and flow rate. Key conversions: Pressure: 1 bar = 100 kPa = 14.504 psi = 0.9869 atm = 10.197 mWC (metres of water column). Stress: 1 MPa = 1 N/mm2 = 145.04 psi = 10.197 kgf/cm2. Force: 1 kN = 101.97 kgf = 224.81 lbf. Energy: 1 kWh = 3.6 MJ = 860 kcal.
Temperature conversions: Celsius to Fahrenheit: F = (C x 9/5) + 32; Celsius to Kelvin: K = C + 273.15. Flow rate: 1 m3/s = 1000 L/s = 35.315 ft3/s (cusecs) = 15,850 US gal/min. Dynamic viscosity: 1 cP (centipoise) = 1 mPa.s = 0.001 Pa.s (SI). Common unit system confusions: in oil and gas, pressure is often in barg (bar gauge) vs bara (bar absolute) vs barg vs psia/psig; flow is in MMSCFD (million standard cubic feet per day) or Sm3/day; temperature is in degrees C or K for thermodynamic calculations. Always document unit conventions in engineering calculations to prevent errors.