Stop reformatting Excel. Straktu generates NSCP 2015-compliant structural calculation PDFs with every formula visible, every clause cited, and your firm's seal block ready to sign.
Solo plan at ₱799/month after trial · Cancel anytime
Effective depth, d
440 mm
Rn required
3.42 MPa
Steel ratio ρ
0.00897
ρ_min
0.00337
ρ_max
0.02032
As,req
1,204 mm²
Not a port of Mathcad. Built from scratch for NSCP 2015-compliant permit submissions.
No black boxes. Every intermediate value is shown step-by-step, exactly as OBO reviewers expect to see it.
Each output row is paired with its code section in the right margin. Permit reviewers can audit every assumption.
Your firm letterhead, engineer name, license number, and dry-seal block — entered once, applied to every calc sheet.
The full set of calcs a structural building permit typically requires.
Calculation engine is open-source under MIT. Read the math →
Annual plans get 2 months free. Cancel any time.
Try every calculator. PDFs include a trial watermark.
One seat. Clean PDFs with your seal. Unlimited projects.
Up to 5 engineers sharing a project library.