How many hertz is 1 kHz?

The metric prefix 'kilo-' (k) stands for one thousand (1,000). Therefore, 1 kilohertz (kHz) is exactly equal to 1,000 hertz (Hz). This standard metric multiplier is used across all electronics and radio measurements, just as it is for distances (kilometers) or weights (kilograms). The other options are incorrect because they are off by factors of 10 or 100. Always remember that 'kilo' means you multiply the base unit by 1,000.