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. Built by an engineer who needed exactly this and nothing else.
Pressure
20Convert between pressure units used in process engineering, instrumentation and piping design: psi, bar, kPa, MPa, atm, mmHg and Torr.
Flow Rate
20Volumetric flow rate conversions for pumps, compressors, control valves and process piping: m³/hr, L/s, gpm, cfm and more.
Temperature
10Convert temperature between Celsius, Fahrenheit, Kelvin and Rankine — the four scales used across process and thermal engineering.
Power and Energy
15Power and energy conversions for motors, drives, heaters and thermal duty: kW, hp, MW, BTU/hr, kWh, MJ, joules, calories and BTU.
Density and Mass
15Density and mass conversions for fluid properties, material balances and reagent dosing: kg/m³, lb/ft³, SG, g/cm³, kg, lb, t, g, mg and oz.
Volume
10Volume conversions for tanks, vessels and process inventories: m³, litres, US gallons, ft³, oil barrels and millilitres.
Length and Area
10Length and area conversions for layout, drawings and site planning: mm, inches, metres, feet, km, miles, m², ft², hectares and acres.
Velocity
10Velocity conversions for fluid flow, gas streams and motion: m/s, km/h, mph, ft/s, knots and Mach.
Deterministic
Every conversion factor is hard-coded from SI definitions. No floating-point drift between sessions.
Auditable
Every page shows you the formula and a worked example. You can verify our math in seconds.
Fast
Static pages, no client-side bundle besides the converter widget itself. Loads on a 3G connection.