Resistance is measured in ohms (Ω). Resistors span a huge range, so prefixes are essential: 1 kΩ = 1,000 Ω and 1 MΩ = 1,000,000 Ω. Schematics often replace the decimal point with the prefix, so 4k7 means 4.7 kΩ and 2M2 means 2.2 MΩ. This converter moves between milliohms, ohms, kilohms and megohms. It is useful for reading resistor colour codes, checking multimeter readings, and applying Ohm's law (V = I × R), where all values must be in base units.
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