calcnote ACI 318-19
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ACI 318-19 rectangular tied-column calculator with .docx calc-note output.

Uniaxial bending, short columns per ACI 318-19. Free. Verification report published.

Runs a strain-compatibility check with Whitney stress block, dynamic φ per §21.2.2, and slenderness gate. Returns a P-M interaction diagram, PASS/FAIL verdict with D/C ratio, and a draft calc-note (.docx) a licensed Engineer of Record can review, sign, and seal.

Run a calc See sample output ↓

ACI 318-19 verification report — Wight + spColumn cross-validation

Project: 12-story tower
Engineer: John Doe, P.E.
Date: May 9, 2026
Page: 1 of 2
Design inputs
b12 in
h12 in
f'c10 ksi
fy60 ksi
Pu400 kip
M₂40 k-ft
P-M Interaction Diagram
M [kip-ft] P [kip]
Capacity Check: Pass
ACI 318-19 compliant
Independently verified
Engineer-signable
Free tier available

How the calculator works

1. Enter inputs

20 fields per column: geometry, materials, reinforcement, factored loads.

2. Run the math

Whitney stress block, dynamic φ, P-M interaction polygon: all deterministic, all cited to ACI 318-19.

3. Download .docx

Ready-to-sign calc-note with equation walkthrough, P-M diagram, PASS/FAIL verdict, footer disclaimer.

Pro tier · in development

Calculation-aware narrative drafts with rigorous ACI clause citations. Pricing under discussion — pay-per-calc, credits, or monthly. Join the waitlist to influence the shape and get early access.