Free Engineering Tool #223
Anchor Bolt Pullout Calculator
Calculate anchor bolt pullout capacity per ACI 318. Enter bolt diameter, embedment depth and concrete strength.
Results
ACI 318 Concrete Breakout
Where kc=24 for cast-in anchors, hef is effective embedment, and f’c is concrete compressive strength.
A 35° cone from the anchor head to the concrete surface. The projected area determines the capacity.
Distance from concrete surface to the bearing surface of the anchor (head or nut).
Capacity is proportional to √fc. Doubling fc increases capacity by ~41%.
Reduced edge distance requires capacity reduction factors per ACI 318.
Cast-in anchors use kc=24. Post-installed may use kc=17 depending on type and approval.
The procedures described on this page were developed and field-tested by the Vibromera team using the Balanset-1A, a portable dual-channel balancer and vibration analyzer for on-site rotor balancing.
Professional instruments for industrial applications.
