Stringer layout for a 102 inch rise
Calculate your stair rise with a total rise of 102 inches while adhering to the IRC riser limit of 7.75 inches. Ensure safety and compliance in your construction project.
Formula SSC-2026.1
IRC check pass
Risers / treads
14 / 13
Riser inside 4 to 7.75 in
Exact riser
7 5/16 in
185.1 mm
Total run
11 ft 4 1/2 in
3,467 mm
Stringer length
14 ft 2 3/8 in
Order 16 ft 2x12
Incline
36.77°
Square 7 5/16 in rise · 10 1/2 in run
Stringers @ 16 in
3
Throat 5.26 in on a 2x12
Rise, run, and the incline are scaled from the live riser and tread. Framing-square gauges match the exact riser and the tread depth.
| Item | Net | Waste | Order | Unit price | Line total | Source Spec Material / Tool |
|---|---|---|---|---|---|---|
| 16 ft 2x12 | 14.81 ft cut | end cuts included | 3 boards | USD | $100.80 | Source Spec Material / Tool |
| Stringer delivery weight | 134 lb | — | 61 kg | 2.8 lb/ft planning weight | — | Source Spec Material / Tool |
Source links open a product search on the Amazon storefront for the selected currency. SiteSpecCalc may earn a commission. The link does not change the quantities above.
| Total rise | Risers | Exact riser | Treads | Run | 2x12 stock | Check |
|---|---|---|---|---|---|---|
| 8 ft 6 in | 14 | 7 5/16 in | 13 | 11 ft 4 1/2 in | 16 ft | Pass |
| 9 ft 0 in | 14 | 7 11/16 in | 13 | 11 ft 4 1/2 in | 16 ft | Pass |
Show the deterministic formula
Risers = round(total rise ÷ target rise). Exact riser = total rise ÷ risers, reported to the nearest 1/16 in and in millimeters. Treads = risers − 1. Total run = treads × tread depth.
Diagonal = hypotenuse of stringer rise and total run. A dropped header uses total rise minus landing thickness. Stock is the next 8, 10, 12, 14, 16, 18, 20, or 24 ft board.
Stringers = floor(width ÷ 16) + 1, with a minimum of 2. Throat ≈ 11.25 − (riser × tread) ÷ hypotenuse.
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Project: Stringer layout for a 102 inch rise
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This sheet is an estimate for ordering and layout discussion. It is not a sealed design. Confirm the quantities with a licensed local professional and the authority having jurisdiction before you buy or build.
Engineering notes
When designing stairs, it is crucial to adhere to the International Residential Code (IRC) guidelines. For a total rise of 102 inches, the maximum riser height allowed is 7.75 inches. This ensures safety and accessibility in your stair design.
Note that headroom calculations are not included in this assessment, but it is essential to ensure that your stairway provides adequate clearance for safe passage.
Code reference
IRC R311.7.5
Field questions
- What is the maximum riser height allowed by the IRC?
- The maximum riser height allowed by the IRC is 7.75 inches.
- How do I calculate the number of risers for a total rise of 102 inches?
- To calculate the number of risers, divide the total rise (102 inches) by the maximum riser height (7.75 inches). This gives you approximately 13.06, meaning you would need 14 risers to accommodate the total rise.
- Is headroom required in stair design?
- Yes, while headroom is not calculated in this specific context, it is important to ensure that your stairway provides adequate clearance for safe passage.