Estimate anchor holding power instantly.
Select your soil class, helix diameter, and installation depth to get a preliminary ultimate capacity and safe working load — calculated using the Individual Bearing Method (Qu = Aₕ · (c·Nc + γ'·D·Nq)).
Holding capacity by soil & geometry
Adjust the sliders to explore how helix size and depth interact with your site's soil conditions. All results use a Factor of Safety of 2.0 per standard helical pile practice.
Screw Anchor Holding Power Calculator
Helical pile capacity · Individual Bearing Method
Cohesive soil — driven by undrained shear strength, with depth adding overburden.
Capacity is generated directly from the surface area of the steel plate pushing against stable soil — a larger helix or deeper, firmer ground means more holding power.
Ultimate Holding Capacity
≈ 202 kN
Safe Working Load
Factor of Safety · 2.0
Disclaimer: This calculator is for preliminary estimation purposes only. Actual holding capacities must be verified in the field by our engineers using real-time torque-to-capacity correlation (Kt factor) during installation.
How the calculation works
The Individual Bearing Method treats each helix plate as an independent bearing element. Ultimate capacity is computed as Qu = Aₕ · (c·Nc + γ'·D·Nq), where:
- Aₕ — projected helix plate area (m²)
- c — undrained shear strength (kPa), for cohesive soils
- Nc, Nq — dimensionless bearing capacity factors by soil class
- γ' — submerged unit weight of soil (kN/m³)
- D — installation depth (m)
Field capacity estimation uses our real-time torque-to-capacity method (Qult = Kt × T) during installation — results from this calculator are for preliminary sizing only.