UNIT CONVERTER
Unit Converter
Length, weight, temperature, and volume — convert between units instantly.
How this tool works
Length, weight, and volume conversions work by converting your input to a common base unit (meters for length, kilograms for weight, liters for volume), then converting from that base into whatever unit you want — this is why the tool can convert directly between, say, miles and centimeters without needing a separate formula for every possible pair of units.
Temperature is handled differently, since Celsius, Fahrenheit, and Kelvin don't share a simple multiplication factor the way length units do — they use genuine offset formulas (like Fahrenheit = Celsius × 9/5 + 32) rather than a straight ratio, which this tool applies correctly rather than approximating.
Frequently asked questions
Why can't I convert weight to volume, or length to weight?
Those are different physical properties — a unit converter can only convert within the same category (length to length, weight to weight) because converting between them would require also knowing a substance's density, which varies by material.
What's the difference between a US gallon and other gallons?
The US gallon (used in this tool) is smaller than the UK imperial gallon — about 3.785 liters versus roughly 4.546 liters. If you're working with UK measurements, double-check which gallon a source is using.
How precise are these conversions?
The conversion factors used are standard, internationally recognized values (like exactly 2.54 cm per inch), and results are shown to 4 decimal places — more than sufficient precision for everyday use, cooking, travel, or general reference.
Why does swapping units sometimes show a slightly different number than expected?
Rounding at 4 decimal places can occasionally cause a tiny discrepancy when converting back and forth repeatedly — the underlying math is exact, but displayed results are rounded for readability.
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