Riser Height Calculator for HT Design Seating

Home Theater Planning Tool

Home Theater Riser Calculator

Estimate the platform height needed for a rear row to see over the front row toward the bottom of the screen.

S: floor to screen bottom

Inches from floor to bottom of visible screen.

H1: front row top of head

Seated front-row obstruction height.

E1: rear row eye height, no riser

Seated rear-row eye height before adding platform.

D1: screen to front-row eyes

Horizontal distance in inches.

D2 value

Usually front-row eyes to back-row eyes spacing.

D2 meaning

Use spacing if D2 is the distance behind front row.

Extra sightline clearance

Optional extra inches above the front-row head. Use 0 to match the basic formula; 2-4 inches is more conservative.

Formula:
V1 = H1 - S
R = V1 / D1
Back row screen distance = D1 + D2, unless D2 is already screen-to-back-row distance
V2 = R x back row screen distance
E2 = V2 + S + clearance
Riser height = E2 - E1

Riser recommendation

Recommended riser height: 5"

Result is rounded up to the nearest half inch. Verify room layout before construction.

Recommended riser

rounded up

Raw riser

4.94"

E2 - E1

Back row distance

240"

used in calculation

12"

H1 - S

0.07059

V1 / D1

44.94"

required rear eye height

16.94"

rear vertical rise

Screen bottom

28"

default S

Default example

using D1 + D2

Calculation notes

V1 = H1 - S = 40" - 28" = 12".
R = V1 / D1 = 12" / 170" = 0.07059.
Back row screen distance = D1 + D2 = 170" + 70" = 240".
V2 = R x back row screen distance = 16.94".
E2 = V2 + S = 44.94".
Riser height = E2 - E1 = 4.94", rounded up to 5".

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Riser Height Calculator for HT Design Seating

Home Theater Riser Calculator

Calculation notes

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