Stair Rise Calc
Answer Worked out from a total rise of 96.00 inches, floor to floor.

Riser height calculator

Riser height67/8in6.857 in
Total rise
96in96.00 in8 ft
Risers
14
The total rise of 96.00 inches as a stack of 14 equal risers between two floors, with one riser dimensioned at 6.857 inches and the bottom cut dropped by the 1.00 inch tread thickness. Total rise96 in Riser height67⁄8 in Risers14 Tread thickness1 in
Given

What this was worked out from

in
in
in
in
in

These are the figures every number on this page is worked for.

Solution

Every dimension of this flight

To the nearest sixteenth
DimensionValue
Total rise 96in96.00 in8 ft
Risers 14
Riser height 67/8in6.857 in
Treads 13
Tread run 11in11.000 in
Total run 143in143.000 in11 ft 11 in
One step along the edge 1215/16in12.962 in
Marked length 1811/2in181.472 in15 ft 1.47 in
Stringer length 1721/4in172.235 in14 ft 4.24 in
Board length 16ft
Angle 31.9°
Stringer angle 33.9°
2 risers + 1 tread 2411/16in24.71 in2 ft 0.71 in
Bottom cut deduction 1in1.000 in
Tread thickness 1in1.00 in
Nosing 1in1.00 in
Stair width 36in36.00 in3 ft
Options

Every riser count this height splits into

Steps Riser Result
14 67/8in Within
13 73/8in Within
15 63/8in Within
16 6in Within
17 55/8in Within
18 55/16in Within

No two risers in a flight may differ by more than 0.375 in.

Code

Each figure against the limit it has to meet

Dimension Limit Code Result
Riser height, maximum 73/4in IRC 2021 (residential) Within
Tread depth, minimum 10in IRC 2021 (residential) Within
Stair width, minimum 36in IRC 2021 (residential) Within
Riser variation, maximum 3/8in IRC 2021 (residential) Within
Riser height, minimum 4in ADA 2010504.2 Within
Riser height, maximum 7in ADA 2010504.2 Within
Tread depth, minimum 11in ADA 2010504.2 Within
Nosing projection, maximum 11/2in ADA 2010504.5 Within
Asked about this

Questions people search for

How do you calculate stair risers?
Divide the total rise by a target riser height and round to a whole number of risers, then divide the total rise by that count again. The second division is the riser height you cut.
How many steps for a 96-inch rise?
14 risers at 6.857 inches each. 96 inches also divides into 14, 13, 15 risers and stays inside the band this site lists; the table on this page has each one.
How far apart should stair risers be?
Every riser in a flight is cut to the same height, and no two may differ by more than 0.375 inch under the residential code row on this page.
Calculators

Work out one part on its own

Source

Where the limits come from

2 sources, with the date each was read

Building codes are adopted and amended locally. Confirm every figure with the code your jurisdiction has adopted before you cut.

Updated September 2026