What a 7.5-inch riser paired with a 11-inch tread actually gives you — pitch, comfort, and code status — plus the calculator to size a full flight.
A 7.5-inch riser with a 11-inch tread is compliant under IRC 2021 (max riser 7.75″, min tread 10.0″), and non-compliant under the IBC commercial standard (max riser 7.0″, min tread 11.0″).
This pair is one step's geometry. To size a complete flight for your floor-to-floor height, enter your total rise in the calculator and it will hold the riser near 7.5″ while checking every code limit.
A 7.5-inch riser with a 11-inch tread produces a 34.3-degree pitch, which is squarely in the comfortable range for a staircase. In practice that means it is a natural everyday rhythm that suits a main staircase. Its Blondel value of 26.0 inches sits just above the 24–25 inch Blondel band — a touch tall in the step, but still comfortable.
Across a typical flight of about 14 treads, the 11-inch tread depth works out to roughly 11.9 feet of horizontal run — a moderate footprint. It is fine for a residential stair under the IRC but would fail an IBC commercial plan review because its 7.5-inch riser exceeds the IBC's 7-inch cap.
This is a sound general-purpose main-stair pairing: comfortable to climb yet reasonably efficient with floor space. Whatever your floor-to-floor height, the calculator below will hold the riser near 7.5 inches, divide the rise into uniform steps, and check the result against the code you select.