Universal Unit Converter

Instantly convert metric and imperial units across length, mass, temperature, area, volume, and speed.

What is the Online Unit Converter?

The free Universal Unit Converter provides instant conversions across five major measurement categories: Length, Weight & Mass, Area, Volume, and Temperature. Convert easily between International Metric units (meters, kilograms, liters, Celsius) and Imperial units (feet, inches, pounds, ounces, gallons, Fahrenheit) with clear conversion tables for academic study, DIY projects, and everyday reference.

By entering a single number in any unit, you receive an immediate, real-time matrix of corresponding converted values across all related measurement units. Equipped with built-in memory registers (MC, MR, M+, M−, MS), you can transfer converted measurements directly into cost and sizing equations.

Step-by-Step Guide: How to Convert Units

Select Category: Choose Length, Weight/Mass, Temperature, Area, Volume, Speed, or Data Storage.
Input Value & Source Unit: Enter the quantity and choose the initial unit (e.g., 100 lbs or 350 °F).
Review Output Matrix: Instantly view converted equivalents across all metric and imperial units.
Save to Memory: Retain converted values with MS and M+ for project blueprints or recipe scaling.

Standard Conversion Constants & Formulas

Length: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.609344 km
Mass / Weight: 1 lb = 0.45359237 kg, 1 oz = 28.349523 g
Temperature: °F = (°C × 9/5) + 32, °C = (°F − 32) × 5/9, K = °C + 273.15
Volume: 1 US Gallon = 3.78541 Liters, 1 UK Gallon = 4.54609 Liters

Practical Real-World Conversion Examples

Baking Oven Temperature (Fahrenheit to Celsius): 350 °F = (350 − 32) × 5/9 = 176.67 °C (approx. 180 °C).
Lumber & Construction (Inches to Centimeters): 36 inches (3 ft) = 36 × 2.54 = 91.44 cm.
Automotive Speed (Miles per Hour to km/h): 65 mph = 65 × 1.60934 = 104.61 km/h.

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Frequently Asked Questions (FAQ)

How do you convert inches and feet to centimeters and meters?

1 inch is exactly 2.54 centimeters, and 1 foot (12 inches) is exactly 30.48 centimeters (0.3048 meters). For example, 6 feet is 6 × 30.48 = 182.88 cm.

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

1 pound is approximately 0.453592 kilograms (1 kg ≈ 2.20462 lbs). Multiply pounds by 0.453592 to get kilograms (e.g., 150 lbs ≈ 68.04 kg).

What is the formula to convert Fahrenheit (°F) to Celsius (°C)?

°C = (°F − 32) × 5 / 9. For example, 212 °F is (212 − 32) × 5 / 9 = 100 °C.

How do you convert square feet (sq ft) to square meters (sq m)?

1 square foot is approximately 0.092903 square meters (1 m² ≈ 10.7639 sq ft). For example, a 1,000 sq ft apartment is approximately 92.9 m².

What is the difference between a US Gallon and an Imperial UK Gallon?

A US liquid gallon is 3.78541 liters (128 US fl oz), while an Imperial UK gallon is 4.54609 liters (160 UK fl oz).

How do you convert Miles per Hour (mph) to Kilometers per Hour (km/h)?

Multiply mph by 1.609344 (e.g., 60 mph × 1.609344 ≈ 96.56 km/h). To convert km/h to mph, multiply by 0.621371.

What is the difference between Decimal (1000) and Binary (1024) Data units?

Storage manufacturers use base-10 (1 GB = 1,000 MB), whereas operating systems use base-2 binary units (1 GiB = 1,024 MiB).

Can I copy or transfer converted values into other calculators?

Yes, save converted results with the memory key (MS) and recall them into the main calculator or percentage tools using MR.

Does this converter support culinary cup measurements?

Yes, it provides volume conversions for standard US measuring cups (approx. 236.6 ml), metric cups (250 ml), and fluid ounces.

Is this unit converter free on mobile phones and tablets?

Yes, it is 100% free with no registration required and responds instantly across iOS and Android browsers.

How accurate are the conversion factors used by this tool?

Our unit converter utilizes exact international standard conversion constants (such as NIST and ISO definitions) with double-precision floating point accuracy.