Tanner Stage Calculator for Boys

Your Age: Under 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 or over

Growth:

Voice:

Body Hair:

These questions assume that you do not shave your body hair. If you have, answer as what you would have if did not shave.

There is no hair around my genitals

There are fine hairs growing near the base of my penis

There are hairs growing across my groin, but it looks thin, the color is lighter than the hair on top of my head, and the hairs tend to be straight.

There are hairs growing across my groin, which are thick and curly.

There is a strip of fine hair growing up from my genitals to my navel (belly button).
There are hairs growing across my groin that are thick and curly and it spreads across my inside thighs as well.

Chest:

I have nipples on my chest that are pale and soft like every other child.

A darker ring is forming around my nipples.

My breasts are swelling and sticking out a bit.

There is a distinct ring around my nipples and the nipples stick out a bit.

My chest has increased in size and you can feel hard muscles under the skin.

Face:

Genitals:

Estimated Tanner Stage:

What does the number mean?

Dr. Tanner divided development into five stages:

Stage 1: Is childhood. It lasts from birth until puberty.

Stage 2: Begins from the first external signs of puberty to your growth spurt.

Stage 3: This is the period when you grow the most quickly.

Stage 4: Starts when the rapid growth slows down and ends when you stop growing in height.

Stage 5: Is full physical maturity. There is still some development going on, but the growth in height has stopped and your body has reached its adult shape.

Details of each stage can be found below. The calculator uses the physical characteristics you report to make the same assessment a doctor would make in determining how far you have developed. Thus, a "2.1" would mean that you just started showing signs of entering adolescence, a "3.5" would mean you are right in the middle of your growth spurt, while a "4.8" would mean that you are just about done physically developing.

Are you curious as to what each stage of development brings? The following pages give a description about the changes which happen in each Tanner stage.

Want to Help Improve the Calculator?

If you think the estimate was off and you would like to help improve the calculator, take a look at the description and images of the five stages and decide which one more closely fits you. Then make sure the form above is filled out (so I can have a record of your answers to consider) then fill in the following:

Which stage do you think you are in? What leads you to that conclusion? Which questions were hard to answer?

Correction to Results:

This will create an email to send. If your computer is not set up to send email from a web page, it won't work.

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