Unit Conversions Calculators
Between unit systems without the 3 a.m. mistakes.
- dB ConverterConvert power between W, mW, dBm, and dBW in one shot.P(dBm) = 10 · log₁₀( P / 1 mW )
- Airflow Units (CFM ⇄ m³/h ⇄ L/s)The three dialects of volumetric airflow, converted exactly.1 CFM = 1.699011 m³/h = 0.471947 L/s (1 ft = 0.3048 m exactly)
- Pressure ConverterPa, kPa, bar, psi, atm, mmHg, inH₂O, and Torr — one value, every dialect.1 atm = 101,325 Pa 1 psi = 6,894.757 Pa 1 bar = 10⁵ Pa
- Volumetric Flow ConverterL/s, L/min, m³/h, US GPM, and CFM — pump curves to duct specs.1 GPM(US) = 3.785412 L/min 1 CFM = 1.699011 m³/h
- Torque ConverterN·m, lbf·ft, lbf·in, kgf·m, and ozf·in — wrench specs in every dialect.1 lbf·ft = 1.355818 N·m 1 kgf·m = 9.80665 N·m
- Energy ConverterJ, kJ, Wh, kWh, BTU, cal, ft·lbf — plus the eV for the physicists.1 BTU(IT) = 1055.056 J 1 kWh = 3.6 MJ 1 cal(th) = 4.184 J
- Power ConverterW, kW, both horsepowers, BTU/h, and tons of refrigeration.1 hp = 745.6999 W 1 hp(metric)/PS = 735.4988 W 1 TR = 3516.853 W
- Temperature Converter°C, °F, K, and °R — the one conversion with offsets, done right.K = °C + 273.15 °F = 1.8·°C + 32 °R = 1.8·K
- Length Convertermm to nautical miles, with the PCB designer's mil in between.1 in = 25.4 mm (exact, 1959) 1 nmi = 1852 m
- Mass & Force Converterkg, lb, oz, slug — and their weights in N, kgf, lbf at standard gravity.1 lb = 0.45359237 kg (exact, 1959) F = m·g₀, g₀ = 9.80665 m/s²
- Area & Volume Converterm², ft², in² and L, gal(US), ft³, m³ — enter either or both.1 ft² = 0.09290304 m² 1 gal(US) = 3.785412 L 1 ft³ = 28.31685 L
- Angle ConverterDegrees, radians, gradians, arcminutes, mrad — and the NATO mil.1 rad = 180/π ≈ 57.29578° 6400 NATO mil = 360° (so 1 mil ≈ 0.98175 mrad)
- Speed Converterm/s, km/h, mph, knots, ft/s — with the sea-level Mach number thrown in.1 kt = 1852 m/h = 0.5144444 m/s 1 mph = 0.44704 m/s a₀(ISA, SL) = 340.294 m/s