convertX — Unit Converter

ConvertX is the most complete unit converter for engineers, students, and everyday users. 400+ units across 44 categories — from everyday measurements to a full professional engineering suite. 100% offline. ★ EVERYDAY CATEGORIES — FREE Length, Weight, Temperature, Area, Volume, Speed, Time, Data Storage, Pressure, Energy, Power, Angle, Fuel Efficiency, Frequency ★ CURRENCY CONVERTER 30+ currencies with live exchange rates. Works offline with cached data. No account needed. ★ ENGINEERING SUITE — PRO The only unit converter with a complete engineering toolkit: ⚙ Mechanical: Force, Torque, Stress, Density, Dynamic & Kinematic Viscosity, Acceleration, Angular Velocity 🏗 Civil: Flow Rate, Stress Intensity, Illuminance, Concentration, Water Hardness ⚡ Electrical: Voltage, Resistance, Capacitance, Inductance, Current Density 🔥 Thermal / HVAC: Thermal Conductivity, Heat Flux, Cooling Load, Specific Heat ⚗ Science: Radiation Dose, Radioactivity, Molar Amount 💎 Material Science: Hardness (HRC, HV, HB, Shore), Elastic Modulus ★ BUILT FOR REAL USE • Big bold 48-point numbers — see your result at a glance • Dark neon UI — easy on the eyes on-site or in the lab • Swap units with one tap • Copy result to clipboard • Favorites — pin your most-used converters • Conversion history — last 50 saved automatically • 100% offline — all unit math works without internet ★ PRIVACY No account required. No data collected. No tracking. ★ PRO — $4.99 ONE-TIME Unlock all 29 engineering categories. Lifetime access. No subscription. One payment. All future engineering categories included. The best unit converter for mechanical engineers, civil engineers, electrical engineers, HVAC technicians, material scientists, chemistry students, and anyone who needs fast metric to imperial conversions on the go.