Anchor Bolt Concrete Breakout Calculator
ACI-style concrete cone breakout for a single anchor far from edges.
The concrete cone, not the steel, usually governs shallow anchors: a 100 mm embed in M25 breaks out at ~45 kN while the M16-8.8 bolt itself could hold 90. Embedment depth is everything.
Formula
Note: Single anchor, no edge/group effects, uncracked concrete. Real designs need the full ACI 17 reduction chain.
Anchor Bolt Concrete Breakout Calculator is a free anchor breakout for structural engineers, fabricators and site engineers โ instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Anchor Bolt Concrete Breakout Calculator
ACI-style concrete cone breakout for a single anchor far from edges. The calculation implements N_b = 10ยทโf'_cยทh_ef^1.5 (N, MPa, mm โ cast-in, uncracked) (ACI 318 ch. 17 โ anchoring to concrete). The concrete cone, not the steel, usually governs shallow anchors: a 100 mm embed in M25 breaks out at ~45 kN while the M16-8.8 bolt itself could hold 90. Embedment depth is everything.
How to use Anchor Bolt Concrete Breakout Calculator
- 1Enter Effective embedment h_ef in mm.
- 2Enter Concrete f'_c (cylinder) in MPa (โ 0.8 ร cube f_ck).
- 3Read Basic breakout N_b, Design value (ฯ = 0.65) instantly โ no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Anchor Bolt Concrete Breakout Calculator?
- โImplements the standard formula โ N_b = 10ยทโf'_cยทh_ef^1.5 (N, MPa, mm โ cast-in, uncracked)
- โReference cited on-page: ACI 318 ch. 17 โ anchoring to concrete
- โOne-click SI โ Imperial toggle โ values convert in place, physics stays in SI
- โLive worked example: the substitution recomputes from your numbers
- โRuns entirely in your browser โ nothing uploaded, free forever
Frequently asked questions
What formula does the Anchor Bolt Concrete Breakout Calculator use?+
It computes N_b = 10ยทโf'_cยทh_ef^1.5 (N, MPa, mm โ cast-in, uncracked), per ACI 318 ch. 17 โ anchoring to concrete. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
The concrete cone, not the steel, usually governs shallow anchors: a 100 mm embed in M25 breaks out at ~45 kN while the M16-8.8 bolt itself could hold 90. Embedment depth is everything. Note: Single anchor, no edge/group effects, uncracked concrete. Real designs need the full ACI 17 reduction chain.
Can I use this for real structural design?+
It implements the exact textbook/code formula cited below the result and is ideal for sizing, checking and learning. Final designs should be verified by a qualified engineer against the full code with all load cases.
Is the Anchor Bolt Concrete Breakout Calculator free to use?+
Yes โ completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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