Get distance with module rf 434

Good night, guys...

I'm doing a circuit with the module rf434, and I don't know how do i get the distance from the transmitter to the receiver.
Can u help me, pls?
Thanks.

I don't know how do i get the distance from the transmitter to the receiver.

Tape measure.
Length of string.

The 433mhz modules don't provide a way to determine the distance between the receiver and transmitter.