Unit Conversion Guide for Science and Math Students

Learn how to convert between common units of length, mass, temperature, and volume. Free unit converter for students included.

Unit conversion is an absolute fundamental skill in science, math, cooking, and structural engineering. The failure to properly convert units famously caused NASA to lose a $125 million Mars orbiter in 1999!

Understanding how to seamlessly convert between measurement systems (specifically Metric to Imperial) is a skill every student must master to solve complex word problems and interpret real-world data.

📏 Common Length Conversions

The United States uses Imperial, while the rest of the world uses Metric. You must know these bridges:

From System	To System	Mathematical Multiplier
Inches	Centimeters	Multiply by `2.54`
Feet	Meters	Multiply by `0.3048`
Miles	Kilometers	Multiply by `1.609`
Meters	Feet	Multiply by `3.281`

💡 Pro Tip: To quickly estimate in your head, just remember that a meter is roughly 3 feet (3.28 to be exact).

⚖️ Common Mass (Weight) Conversions

Whether you are in a chemistry lab or at the gym, these are the most critical weight conversions:

From System	To System	Mathematical Multiplier
Pounds (lbs)	Kilograms (kg)	Multiply by `0.4536`
Kilograms (kg)	Pounds (lbs)	Multiply by `2.205`
Ounces (oz)	Grams (g)	Multiply by `28.3495`
Stones (UK)	Kilograms (kg)	Multiply by `6.350`

🌡️ The Golden Temperature Formulas

Unlike length or mass, temperature conversions cannot be done with a simple multiplier because their zero-points are entirely different. You must use formulas:

Direction of Conversion	The Exact Mathematical Formula
Celsius to Fahrenheit	`°F = (°C × 9/5) + 32`
Fahrenheit to Celsius	`°C = (°F - 32) × 5/9`
Celsius to Kelvin (Science)	`K = °C + 273.15`
Kelvin to Celsius	`°C = K - 273.15`

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