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Unit Converter

Convert basic units and engineering units quickly.

Input Information

m
cm
mm
km
in
ft
yd
mile

Result

Unit Converter is a practical tool that lets you convert all basic units (length, area, volume, temperature) and engineering units (flow, pressure, energy, mass, enthalpy) on a single screen. Select a unit from the dropdown, enter a value, and instantly see the converted results for all units in that category.

In daily life, unit conversion is often needed for home decoration, cooking, exercise tracking, and more. In industrial sites and research labs, professional unit conversion is essential when dealing with design drawings, test data, and overseas specifications. This tool is divided into a basic tab and an engineering tab so anyone can use it easily.

For students and teachers, it serves as learning material to understand unit concepts. For engineers and technicians, it is a practical tool for reviewing drawings and specifications. It is also very helpful when reading spec sheets of imported equipment or translating overseas documents.

Conversion coefficients follow the International System of Units (SI) and widely accepted standards. However, temperature (°C, °F, K) is calculated using a separate linear formula, not simple proportion, so be careful not to confuse it with other units.

Term Glossary

International System of Units (SI)
An international standard unit system based on length (m), mass (kg), time (s), and temperature (K). It serves as the basis for most scientific and engineering unit conversions.
Enthalpy
An engineering unit (usually J or kJ) representing the total heat energy of a substance, frequently used alongside flow and pressure in thermodynamics and plant design.
Unit Prefix
Abbreviations like k (kilo) = 1,000x, m (milli) = 1/1,000x, µ (micro) = 1/1,000,000x used to adjust the magnitude of units.

  1. Choose the measurement category (length, area, volume, temperature, etc.).
  2. Choose the input unit to convert from.
  3. Enter the value you want to convert.
  4. Check the converted value in the output unit.

1000 mg → g

1,000 milligrams (mg) is exactly 1 gram (g). It is commonly used in medication dosing.

1 gallon → L

1 US gallon is approximately 3.785 liters (L). It is used for fuel efficiency and liquid capacity.

1 yard → m

1 yard is exactly 0.9144 meters (m). It is often used for field distances in American football.

Linear Unit Conversion Formula

Proportional units like length, area, volume, and mass are converted using reference unit coefficients.

Target Value=Input Value×Target Unit CoefficientReference Unit Coefficient\text{Target Value} = \text{Input Value} \times \dfrac{\text{Target Unit Coefficient}}{\text{Reference Unit Coefficient}}

e.g. 1 m = 100 cm = 1,000 mm, 1 km = 1,000 m

Temperature Conversion Formula

∘F=∘C×95+32^{\circ}\text{F} = ^{\circ}\text{C} \times \dfrac{9}{5} + 32
K=∘C+273.15\text{K} = ^{\circ}\text{C} + 273.15

Temperature has different zero points, so both multiplication and addition are applied.

Calculation Example

Converting 5 km to m and cm:

5 km × 1,000 = 5,000 m = 500,000 cm

Basic Unit Usage

  • Length, area, volume, and temperature are the most commonly used units in daily life.
  • Use the basic tab for home interior or exercise tracking.

Engineering Unit Usage

  • Flow, pressure, energy, mass, and enthalpy are used in plant and mechanical design.
  • Useful when converting units on overseas equipment spec sheets to domestic standards.

Temperature Conversion Caution

  • Celsius, Fahrenheit, and Kelvin (K) are calculated separately using linear formulas.
  • Do not confuse with proportional units as their zero points differ.

Decimals and Significant Figures

  • Adjust the number of decimal places to match the precision of your measured values.
  • Excessive decimals can actually reduce credibility.

Learn Unit Prefixes

  • k (kilo) = 1,000, m (milli) = 0.001, µ (micro) = 0.000001 multipliers.
  • Changing just the prefix makes calculations easier.

Verification Habit

  • For important design values, use a different calculator to verify results at least twice.
  • Especially with pressure and energy units, dimensional errors are common.

QWhich categories are supported?

Supported categories include length, area, volume, temperature, flow, pressure, energy, mass, and enthalpy. Within each category, many units can be converted between each other.

QWhat is the difference between imperial and metric units?

The metric system is based on meters, kilometers, liters, and kilograms and is used in most countries. The imperial system uses feet, miles, gallons, and pounds, mainly in the US.

QHow precise are the conversions?

Conversion results are shown to two decimal places. Calculations use defined conversion factors, so rounding errors are minimal.

QAre compound units supported?

This converter focuses on converting between simple units. Compound units like m/s or complex combined units may not be directly supported here.

QHow is scientific notation handled?

Very large or small values are shown in scientific notation (e.g., 1.23e+6) to express magnitude clearly, making extreme values easy to read.

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