Unit Converter — NumGenie

Unit Converter

Convert length, weight, temperature, volume, area, speed, time and data in one tool. Fast, accurate, UK-friendly formatting.

All-in-one converter

Pick a category, enter a value, choose units and get the result instantly.

Swap and recalc with one click.

Notes: Temperature uses exact formulae (°C, °F, K). Data supports decimal (kB, MB) and binary (KiB, MiB) units. Formatting uses en-GB locale.

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How to use the Unit Converter (step-by-step)

Convert length, weight, temperature, volume, area, speed, time and data with fast, precise results. Works on mobile and desktop.

Quick start

  1. Choose a Category (e.g., Length, Temperature, Data).
  2. Enter a Value (supports decimals like 12.5).
  3. Select the From unit and the To unit.
  4. Click Convert (or press Enter) to see the result instantly.
  5. Use Swap to flip units and recalc in one click. Use Clear to reset.

Category-by-category tips & examples

Length

  • Typical: m ↔ ft, km ↔ mi, cm ↔ in, nmi for nautical miles.
  • Example: 1.8 m → ft = choose Length, value 1.8, From m, To ft, Convert.

Weight (Mass)

  • Metric & imperial supported: mg, g, kg, tonne ↔ oz, lb, st.
  • Example: 75 kg → lb quickly for gym/health tracking.

Temperature

  • Exact formulas: °C ↔ °F ↔ K.
  • Example: 21 °C → °F for travel and weather checks.

Volume

  • Metric (mL, L, m³) + UK and US measures (tsp/tbsp/fl oz/pt/qt/gal).
  • Note: UK and US volume units differ—select the correct system (fl oz (UK) vs fl oz (US)).
  • Example: 2 L → gal (US) for recipes or fuel.

Area

  • m², ft², yd², hectare, acre for rooms, gardens, land.
  • Example: 120 m² → ft² when comparing floor plans.

Speed

  • m/s, km/h, mph, knots, ft/s for sport, travel and aviation.
  • Example: 100 km/h → mph for driving abroad.

Time

  • ms, s, min, h, day, week to convert durations precisely.
  • Example: 2.5 h → min for schedules and study plans.

Data

  • Decimal (kB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) for tech accuracy.
  • Tip: Operating systems often use binary (MiB/GiB), marketing uses decimal (MB/GB). Choose accordingly.
  • Example: 500 MB → MiB to compare downloads vs storage readouts.

Power user tips

  • Keyboard flow: Type value → Tab through fields → Enter to convert.
  • Precision: Results keep up to 10 decimal places; trailing zeros are trimmed for readability.
  • Locale: Output uses UK formatting (en-GB). Input accepts decimals like 12.5.
  • Instant updates: Changing either unit re-runs the conversion automatically.

Troubleshooting

  • “Enter a valid number.” — Remove stray characters (letters, extra commas/spaces). Use a dot for decimals (e.g., 3.75).
  • Wrong temperature result? — Ensure you picked the correct temperature unit (°C vs °F vs K).
  • Data confusion (MB vs MiB) — Switch between decimal (MB) and binary (MiB) to match your device/app reporting.

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