Engineering unit conversions, done properly.
Every page gives you the formula, a precise converter, a reference table and a worked example. No animations. No pop-ups. No nonsense.
Categories are grouped by engineering domain so you can find the right reference in one scan.
- Conversions
- 5,072
- Categories
- 29
- Units
- 471
Conversions by category
Process Conditions
3 categoriesState variables that define a process stream.
Flow & Transport
4 categoriesRates and speeds for fluids and bulk material movement.
Materials & Properties
6 categoriesPhysical properties of fluids, solids and mixtures.
Density and Mass
kg/m³, lb/ft³, SG, g/cm³, kg, lb, t, lb/gal (UK).
Viscosity
Pa·s, cP, mPa·s, poise, cSt, stokes.
Specific Properties
kJ/kg, BTU/lb, kWh/kg, m³/kg, ft³/lb.
Concentration
fraction, percent, ppm, ppb, ppt.
Surface Tension
N/m, mN/m, dyn/cm, mJ/m², lbf/ft, gf/cm.
Permeability
m², cm², mm², µm², ft², in², Darcy, kD, mD, µD, nD.
Mechanical & Dimensional
5 categoriesForces, motion and geometry for mechanical design.
Force and Torque
N, kN, lbf, kip, kgf, ozf, dyne, N·m, lbf·ft.
Acceleration
m/s², ft/s², g, cm/s² (Gal), in/s², mGal, kGal.
Length and Area
mm, inch, m, ft, km, mile, m², ft², acre.
Volume
m³, litre, US gal, ft³, oil barrel, ac·ft, fl oz (US/UK), hL.
Stress
Pa, kPa, MPa, GPa, psi, ksi, N/mm², kgf/cm², hPa, mmHg, dyn/cm².
Energy & Heat
5 categoriesPower, energy and heat-transfer engineering.
Power and Energy
kW, hp, MW, BTU/hr, kWh, MJ, joule, calorie.
Heat Transfer
W/(m·K), W/(m²·K), W/m², BTU/(hr·ft·°F).
Thermal Resistance
K/W, °C/W, mK/W, K/kW, µK/W, K/MW, °F·h/BTU, °F·s/BTU.
Thermal Capacity
J/K, kJ/K, mJ/K, MJ/K, BTU/°F, cal/K, kcal/K, Wh/K, kWh/K.
Specific Heat Capacity
J/(kg·K), kJ/(kg·K), cal/(g·°C), BTU/(lb·°F), kcal/(kg·°C).
Measurement & Instrumentation
6 categoriesElectrical, optical and radiological measurement quantities.
Electrical
V, A, Ω, F, H, C, A·h.
Photometry
lux, foot-candle, phot, cd/m², nit, foot-lambert.
Radiation Dose
gray, milligray, rad, millirad.
Frequency
Hz, kHz, MHz, GHz, rpm, rps, cycles/min, /s, /hr.
Radioactivity
Bq, kBq, MBq, GBq, Ci, mCi, µCi, nCi, pCi.
Digital Data Storage
bit, byte, kB, MB, GB, TB, PB, KiB, MiB, GiB, TiB, PiB.
Three things every page guarantees.
The same standard applied across every category — from pressure and flow to radiation and surface tension.
Deterministic
Every conversion factor is hard-coded from SI definitions. No floating-point drift between sessions.
Auditable
Every page shows the formula and a worked example. You can verify the math in seconds.
Fast
Static pages, no client-side bundle besides the converter itself. Loads on a 3G connection.