Unit Converter
Convert between different units quickly and easily
Usage Instructions
🚀 Quick Start
- Select a category (Length/Weight/Time/Temperature/Area/Volume/Speed/Pressure/Energy/Power/Data Storage/Angle/Frequency)
- Enter a value in any unit (supports decimals and negative values; thousands separators are ignored)
- Other units update automatically; click the icon on each row to copy the result
- Click Clear to reset, or switch Common/All units to simplify the list
📌 Common Scenarios
- Travel/maps: km ↔ mi, ft ↔ m for route planning and international comparison
- Home/DIY: mm/cm ↔ inch/ft for orders and labels
- Shipping/fees: kg ↔ lb/oz for parcels and cross‑border logistics
- Cooking recipes: g ↔ oz, mL ↔ cup for local measuring tools
- Weather & perception: °C ↔°F across regions
- Oven/lab setpoints: °C ↔°F ↔ K for precise control
- Real estate/land: m²/㎡↔ ft², mu/hectare ↔ m² for listings and surveys
- Liquids/mixing: mL/L ↔ fl oz/gal for drinks/chemistry
- Schedules/durations: min/h ↔ s, week ↔ day for rosters
- Speed/pacing: km/h ↔ mph, m/s ↔ km/h for vehicles/running
- Tire/pipe pressure: bar ↔ psi ↔ kPa to match manuals
- Energy/billing: kWh ↔ J (power × time rough estimate)
- Motors/engines: kW ↔ hp/PS for nameplates/regulations
- Storage/bandwidth: MB/GB ↔ MiB/GiB, bit ↔ Byte per vendor/system
- Angle/radian: °↔ rad for CAD/math
- Audio/electronics: Hz ↔ kHz/MHz, RPM ↔ Hz
🎛️ Conversion Parameters & Precision
- Input: decimals and negatives supported; commas are stripped; avoid full-width characters or unit suffixes
- Precision: dynamic significant digits; scientific notation (1.23e±N) for extremely large/small numbers; trailing zeros trimmed
- Computation: normalize to base unit then convert; debounced updates with ratio cache to reduce re-renders
- Copy: button disabled for empty values; shows a checkmark on success
- Precision & display: keep sufficient internal precision; show dynamic significant digits and scientific notation for extreme values
- Note: '=' indicates an exact, defined conversion; '≈' indicates an approximate value (due to rounding or differing unit systems)
🧭 Usage Advice
- Pick a category first, then input; any row can act as the source
- For engineering/printing, apply your business rounding after conversion (tool keeps informative precision)
- For comparison tables, copy target units row by row to avoid misreading
- Consistent systems: keep a single system (SI vs US/Imperial) across tables/reports to avoid mixing
- Significant digits: make explicit the significant digits and rounding rules for external presentation
- All-units view is grouped by systems (SI/Imperial/US/Medical, etc.) for easier navigation
- Power units: hp = mechanical horsepower; PS = metric horsepower
📐 Common Formulas
- Speed = Distance / Time
- Density = Mass / Volume
- Pressure = Force / Area
- Power = Energy / Time
- Flow rate = Volume / Time
- Frequency = 1 / Period
- 1 Byte = 8 bits
⚠️ Limitations & Compatibility
- Display precision: dynamic significant digits; extremes may use scientific notation
- Non-linear: temperature uses offset; check formulas for cross-system conversions
- Rounding: apply your business rounding outside the tool
- Vendor conventions: storage (KB/KiB) and some units differ by convention; choose per scenario
🔒 Privacy & Security
- All processing happens in your browser; data never leaves your device
❓ FAQ
Why scientific notation?
For readability, we use e-notation when |x|≥1e18 or ≤1e−18 (e.g., 1.23e+8)
Can I input 1,234.56?
Yes. We strip thousands separators and treat it as 1234.56
Why is the number of decimal places not fixed?
For readability, we show dynamic significant digits and trim meaningless trailing zeros; extreme values use e-notation
What’s the difference between KB and KiB?
KB = 1000B (decimal), KiB = 1024B (binary); choose per vendor/system