Top-of-steel slope / elevation calculator

Enter the TOS at two points and a run to interpolate the elevation at any distance along a sloped run - useful for checking a field elevation against a sloped beam or ramp.

TOS at A (ft) TOS at B (ft) Total run A→B (ft) Distance x from A (ft)

Enter TOS at A, TOS at B, total run, and distance x to calculate elevation.

Formula & assumptions

Linear interpolation on a constant slope: TOS(x) = TOS_A + (TOS_B - TOS_A) × (x / total_run). Slope = (TOS_B - TOS_A) / total_run, also shown in in/ft and percent. Assumes a straight, constant-slope run between A and B - not valid across a break in slope, a step, or a curved/cambered member.

Field layout aid only. Verify against the contract elevations, datum, and camber diagram - confirm with the project engineer, structural drawings, and survey control before setting steel.