| Thickness | t | Thickness of rectangular concrete section, in the display unit system. | Number |
| Width | b | Width of rectangular concrete section, in the display unit system. | Number |
| Depth to Steel | d | Distance from the extreme compression fiber to the centroid of the reinforcement, in the display unit system. | Number |
| Comp Stress | Fc | Specified concrete compressive strength, in the display unit system. | Number |
| Yield Stress | Fy | Yield stress of reinforcing, in the display unit system. | Number |
| Moment | Mu | Ultimate moment demand, in the display unit system. | Number |
| Axial | Pu | Axial force (compression = negative, tension = positive), in the display unit system. | Number |
| Spirals | S | Whether the section has conforming spiral reinforcement. | Boolean |
| Max Iter | I | Maixmum number of iterations. | Integer |