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Unit Converter

Unit Converter

Unit Converter supports metric, imperial, and US unit conversion across 13 categories including length, weight, temperature, area, volume, time, speed, pressure, energy, power, storage, angle, and frequency.

当前：Length

Thousands grouping

Common only

International System (SI)

Millimeter

mm

Centimeter

cm

Meter

m

Kilometer

km

US Customary (US)

Inch

in

Foot

ft

Yard

yd

Mile

mi

Length Conversion

Meters as base; imperial factors: 1 in = 2.54 cm; 1 ft = 0.3048 m

Common

• 1 kilometer (km) = 1000 meters (m)

• 1 meter (m) = 100 centimeters (cm)

• 1 centimeter (cm) = 10 millimeters (mm)

• 1 inch (in) = 2.54 centimeters (cm)

• 1 foot (ft) = 0.3048 meters (m)

• 1 nautical mile (nmi) = 1852 meters (m)

More

• 1 millimeter (mm) = 1000 micrometers (µm)

• 1 micrometer (µm) = 1000 nanometers (nm)

• 1 yard (yd) = 0.9144 meters (m)

• 1 mile (mi) = 1.609344 kilometers (km)

• 1 foot (ft) = 0.3048 meters (m)
Unit Converter

Quick Start

1
Select a category (Length/Weight/Time/Temperature/Area/Volume/Speed/Pressure/Energy/Power/Data Storage/Angle/Frequency)
2
Enter a value in any unit (supports decimals and negative values; thousands separators are ignored)
3
Other units update automatically; click the icon on each row to copy the result
4
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

Extended workflow

weight converter, temperature converter, and metric to imperial converter can be handled in the same review flow, so you can verify results before copying or exporting.

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 calculations happen locally in your browser. You can replace, clear, and re-run the current conversion at any time.

FAQ

5

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