Standing, hold your erection horizontal.Press ruler against your pubic bone, and measure on top of penis to the tip of the head.
With a piece of string or cloth measuring tape, measure the circumference of your erect penis at mid-shaft.
Press ruler against your pubic bone, and measure on top of penis as far as you can stretch it with your other hand. When this measurement
changes, you'll know you're making progress!
Compare yourself in the mirror with some object that will be around a few months from now - a toilet paper tube or deodorant container.
These visual comparisons are much more powerful than simply using numbers.