Unit Conversion Explained — Length, Weight, Temperature & More

Unit conversion translates a measurement from one unit to another within the same physical quantity — metres to kilometres, Celsius to Fahrenheit, litres to gallons and more.

Why conversion matters

• Travel — speed limits and distances abroad.
• Cooking — volume and weight in recipes.
• Fitness — body weight in kg vs lb.
• Real estate — square feet vs square metres.
• Engineering homework — SI vs imperial systems.

How conversion works

Most units convert through a base unit:

1. Convert source value to base (e.g. metres for length).
2. Convert base to target unit.

Example: 5 kilometres → metres = 5 × 1000 = 5000 m → miles = 5000 ÷ 1609.344 ≈ 3.11 mi

Temperature is special

Celsius, Fahrenheit and Kelvin use formulas, not simple factors:

• °F = (°C × 9/5) + 32
• K = °C + 273.15

Categories covered on MerQPrime

Category	Example conversions
Length	m, km, cm, inch, foot, mile
Weight	kg, g, pound, ounce
Temperature	°C, °F, K
Area	m², ft², acre, hectare
Volume	L, mL, gallon, m³
Speed	km/h, m/s, mph

Accuracy tips

• Use precise conversion constants for engineering work.
• Watch US vs UK gallons (MerQPrime uses US gallon).
• Do not convert across categories (length ≠ weight).

Free unit converter

Open MerQPrime’s unit converter — pick a category, enter a value and get instant results in your browser.