OmniUnit · Unit Converter

🔁 OmniUnit — the universal converter that truly understands numbers and units. Write a calculation the way you'd say it: “5 km + 300 m in mi”, “20% of 50 kg”, “3 N·m in ft·lbf”. A real dimensional-analysis engine handles compound units too (km/h, kg/m³, kWh) — not just fixed tables. ✨ WHAT MAKES IT DIFFERENT • 🧮 Math with units: add, convert, percentages in one line • ⚙️ Compound/derived units (N·m, km/h, L/100km…) • 💱 Currencies & crypto with offline cache • 📐 Pro formatting: inch fractions, feet+inches, significant figures • 🔢 Number bases, fuel economy, and dozens of categories • 🌍 6 languages · 🚫 no ads · 📴 works offline Length, area, volume, mass, temperature, pressure, energy, power, data, angles and much more. Free.