The conversion factor
1 knot equals 1.851997 kilometers per hour. Multiply your knots value by 1.851997 to get kilometers per hour; divide to go back. For the reverse direction, use the kilometers per hour to knots converter or the full speed converter.
Where this conversion comes up
Mixing metric and imperial is a daily reality in travel, shipping, recipes, fitness apps, and spec sheets — this page gives the exact factor plus a scannable table for the values people actually need.