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Helical Pile Calculator

ICC-ES AC358 torque-to-capacity analysis with project cost estimator.

Qu = Kt × T Ultimate Capacity = Torque Factor × Installation Torque

Input Parameters

1 kip 160 kips
5 ft 100 ft

Results

Engineering Analysis

Required Ultimate Capacity 50.0 kips
Required Installation Torque 5,000 ft-lbs
Recommended Pile RS2875 — 2.875" Round
Kt Factor 10 ft⁻¹
Max Torque for Shaft 10,000 ft-lbs
Design Status PASS

Cost Estimate

Materials (piles + ext + brackets) $5,150
Installation Labor $3,750
Mobilization $3,250
Estimated Total $12,150
ⓘ Estimates based on average pricing. Final quotes may vary based on site conditions, steel market, and project specifics. Contact us for a detailed quote.
Reference

ICC-ES AC358 Torque Factors

Standard Kt values used in helical pile capacity calculations.

Shaft Size Type Kt (ft-1) Max Torque (ft-lbs)
1.500" Round / Square 10 5,500
1.750" Square 10 6,500
2.875" Round 10 10,000
3.500" Round 7 15,000
4.500" Round 7 20,000
6.625" Round 5 30,000
8.625" Round 4 40,000

Default Kt = 10 is conservative. Site-specific values established through load testing per AC358 §4.2.

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