Hi quickthrower2, thanks for the feedback. Glad you like it and apologies for the late reply. I somehow totally missed that there were comments in this thread.

Hi quickthrower2, thanks for the feedback. Glad you like it and apologies for the late reply. I somehow totally missed that there were comments in this thread. I got a lot of feedback on producthunt and apparently that was enough to distract me. It should have definitely asked for height and sex, I just tried it and it "works on my iPhone". Perhaps you had to scroll down and that wasn't obvious? Good feedback though, I'll see what I can do there! As for the calculation: the child comment is right (see below), it's a BMR calculation. However, I think I should change it to a TDEE based as that takes daily movement into account. That should make it more realistic. Any thoughts?