Units Converter

Navigating between different measurement systems can complicate engineering design, international shipping, scientific research, and daily calculations. This comprehensive, multi-category Units Converter instantly translates values between the Metric System (SI) and US Customary units.

With real-time processing, this tool eliminates manual multiplication errors across essential physical dimensions, including length, mass, velocity, temperature, and area. Select your target category, enter your known value, and get precise, industry-standard conversion results instantly.

Dimensional Categories Supported

  • Length & Distance: Convert between millimeters, centimeters, meters, and kilometers to inches, feet, yards, and miles.
  • Mass & Weight: Seamlessly switch from milligrams, grams, and kilograms to ounces and pounds (lbs).
  • Velocity & Speed: Bridge the gap between meters per second (m/s), kilometers per hour (km/h), and miles per hour (mph).
  • Temperature Transitions: Input absolute Kelvin or standard Celsius to resolve exact Fahrenheit parameters.

Volume, Area, Time, Pressure and Energy are supported as well.

This converter is easy to use and is available in English and Spanish.

  1. Choose your language
  2. Choose the measurement type
  3. Enter values
    Note: for "Length" measurement type fractional numbers are allowed (example: 12 3/4 or 12-3/4 which is equivalent to 12.75)
  4. Receive results

You might also find helpful: Area and Volume Calculator


Frequently Asked Questions

Why is there a variance between US liquid gallons and Imperial gallons during volume conversions?

The discrepancy is historical and structural. One US Liquid Gallon is legally defined as exactly 231 cubic inches (3.78541 liters). Conversely, one Imperial Gallon (historically used in the UK and Canada) is defined based on the volume of 10 pounds of water, translating to 277.42 cubic inches (4.54609 liters). This converter provides separate configuration parameters for both standards to ensure fluid dynamics and industrial shipping calculations remain strictly accurate.

How do you convert length from meters to feet and inches?

To convert meters to feet, multiply the length value by 3.28084. If you need to convert centimeters to inches, multiply the value by 0.393701 (or divide the inches by 2.54 to go backward). This calculator handles multi-stage length parsing automatically, allowing you to instantly convert precise architectural or mechanical layouts between metric and US dimensions.

How do you convert speed from kilometers per hour (km/h) to miles per hour (mph)?

To convert speed from km/h to mph, multiply the velocity value by 0.621371. For example, a European highway speed limit of 130 km/h converts to approximately 80.8 mph. If you are working in scientific environments and need to convert meters per second m/s) to mph, use the multiplier constant 2.23694.

How do you convert weight from kilograms (kg) to pounds (lbs)?

To convert mass or weight from kilograms to pounds, multiply the metric value by 2.20462. For instance, a 70 kg equipment chassis weighs roughly 154.3 lbs in the US Customary system. To go in reverse from pounds to kilograms, multiply the value by 0.453592.

How do you convert temperature between Celsius (°C) and Fahrenheit (°F)?

Unlike other dimensions, temperature conversion requires an algebraic offset because their zero-points differ. To convert Celsius to Fahrenheit, use the formula °F = (°C × 9/5) + 32. To convert Fahrenheit back to Celsius, subtract 32 first, then scale it: °C = (°F - 32) × 5/9.

How do you convert liquid volume from liters to gallons?

To convert volume from liters to US liquid gallons, multiply the value by 0.264172. Be aware that a US gallon (3.785 liters) is physically smaller than an Imperial (UK) gallon (4.546 liters). This unit converter uses the standard US liquid gallon profile as its default volumetric baseline to align with US industrial specifications.

How do you convert area from square meters to square feet?

Because area scales dimensionally in two directions (X × Y), you cannot use the standard linear length multiplier. To convert square meters (m²) to square feet (ft²), you must multiply the value by 10.7639. For example, a 100 m² workshop footprint equals approximately 1,076.4 ft².

How do you convert mechanical power from kilowatts (kW) to horsepower (hp)?

To convert mechanical power from kilowatts to standard mechanical horsepower, multiply the kW rating by 1.34102. If you are evaluating an electric vehicle or industrial motor rated at 100 kW, this configuration translates to exactly 134.1 hp.

How do you convert pressure from Bars to Pounds per Square Inch (PSI)?

To convert pneumatic or hydraulic pressure from Bars to PSI, multiply the value by 14.5038. If a piece of industrial pneumatic machinery requires an operating pressure of 6 Bars, you must configure your shop's compressor gauge to match approximately 87 PSI.

How do you convert torque from Newton-meters (Nm) to Foot-pounds (ft-lbs)?

To convert mechanical torque ratings from metric Newton-meters to US Customary foot-pounds, multiply the value by 0.737562. This calculation is heavily used by automotive and robotics engineers when translating engine outputs or electric actuator tightening limits.

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Units Converter

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