Plan secure guying with clear load inputs. See tension, utilization, and stretch in seconds easily. Download neat reports for site checks and approvals fast.
| H total (kN) | V total (kN) | Guys | Angle (deg) | SF | Req. tension / guy (kN) | Req. MBS (kN) |
|---|---|---|---|---|---|---|
| 12.00 | 2.00 | 2 | 45 | 2.50 | 8.49 | 23.58 |
| 20.00 | 0.00 | 3 | 40 | 3.00 | 8.70 | 28.99 |
| 8.00 | 3.00 | 1 | 60 | 2.00 | 6.00 | 13.33 |
Guy wires stabilize slender poles, masts, and temporary towers by converting lateral loads into axial tension. A dependable tension estimate helps you select wire size, hardware, and anchor capacity with fewer site revisions. In practice, the dominant load is often horizontal (wind, conductor pull, or equipment offset), while vertical effects come from uplift, slope, or attachment geometry. Because the guy angle is fixed by site constraints, tension rises rapidly as the angle gets flatter. A 30° guy typically carries much higher tension than a 60° guy for the same horizontal demand.
This calculator uses a conservative component approach. Total horizontal and vertical loads are divided by the number of guys assumed to share the demand. The selected angle then converts those component demands into tension requirements. Hardware losses are considered with a termination efficiency factor, and a safety factor converts working tension into required minimum breaking strength. If you enter a known breaking strength, the tool reports utilization and a clear pass/fail check. For quick field documentation, the CSV and PDF exports capture the inputs, the required tension, and the strength requirement in a clean format.
When applying results, confirm that load sharing is realistic. Unequal guys, imperfect alignment, and installation tolerances can shift demand to one wire. Anchor type and soil conditions also matter: even if wire strength is adequate, anchors must resist both the axial tension and any vertical component without excessive movement. For long spans or high pretension, consider stretch. This tool provides an elastic stretch estimate using wire length, area, and modulus. Real ropes may exhibit additional constructional stretch and seating, so treat the value as a baseline.
Example dataset: H = 12 kN, V = 2 kN, two guys at 45°, safety factor 2.5, efficiency 0.90. The calculator returns about 8.49 kN required tension per guy and about 23.58 kN required breaking strength. Use these outputs to select wire and fittings, then verify against your project specification and inspection plan.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.