Americans: just remember for rough mental computations. Keyword rough
1M ≈ 1yard ≈ 3feet
1Kg ≈ 2lb
You can almost basically just convert yards to meters directly. For kilos just 2x in your head for easy math. 2.2 is the actual multiplier, but for estimations, 2x works for most cases.
Idk but I’m in the US and Apple still sells their cables with metric measurement units on the box, so even if OP is in the US they will be buying a 2 meter cable.
And just to be pedantic, if it’s a newer MacBook, then the included cable is a “MagSafe” cable, which has USB-C on one end and a magnetic rectangle to plug in to charge. (You can still do regular USB-C charging if you want)