Every now and again, there's a thread about what is an appropriate riser height. Unfortunately, there is no one answer that covers all situations. Everyone's setup is different, and requires a different answer depending on many different variables. Here's a fairly easy formula to figure the exact minimum riser height for your setup.

First, take the following measurements in the same increment (e.g. inches):

S=Floor to screen bottom

H1=Height of seated front row viewers top of head

E1=Height of seated rear row viewers eyes (no riser)

D1=Screen to front row viewers eyes

D2=Screen to back row viewers eyes

Then, plug them into these calculations:

H1-S=V1

V1/D1=R

R*D2=V2

V2+S=E2

E2-E1=Riser height

V1=Vertical 1, V2=Vertical 2, E2=Back row eye level (with riser).

This formula uses a single height viewer in both rows. If you think you'll have taller people in front and shorter people in back, you might want to adjust the numbers slightly to compensate. You will probably come up with a number that seems too high. It is not. This number is the minimum riser height that will allow a person seated in the back row to see the entire screen, over the head of a person seated directly in front of them. Anything less, and some of the screen will be blocked.

Happy Building!

Rob

**Riser Calculator***Courtesy of***trunks**in Post #2First, take the following measurements in the same increment (e.g. inches):

S=Floor to screen bottom

H1=Height of seated front row viewers top of head

E1=Height of seated rear row viewers eyes (no riser)

D1=Screen to front row viewers eyes

D2=Screen to back row viewers eyes

Then, plug them into these calculations:

H1-S=V1

V1/D1=R

R*D2=V2

V2+S=E2

E2-E1=Riser height

V1=Vertical 1, V2=Vertical 2, E2=Back row eye level (with riser).

This formula uses a single height viewer in both rows. If you think you'll have taller people in front and shorter people in back, you might want to adjust the numbers slightly to compensate. You will probably come up with a number that seems too high. It is not. This number is the minimum riser height that will allow a person seated in the back row to see the entire screen, over the head of a person seated directly in front of them. Anything less, and some of the screen will be blocked.

Happy Building!

Rob