In the program I use, Reaper, I right click the WAV I'm editing, click on Item Properties, and there's an area with a 1.00000000 in it called playback rate. Since 1.000000 is the original playback rate, you would pretend that means 100% of the original BPM. From here on, our imaginary BPM is 160. If you replaced 1.000 with .5, it'd play at half speed, or 50%, which is about 80 BPM. if you made it 1.25, it'd play at 1.25 times the speed, or 125%, which would be around 200 BPM.
In whatever DAW you're using, there should be a similar function.