Post-Tensioned Slab Calculator
Design post-tensioned (PT) concrete floor slabs
Slab Properties
Tendon Layout
Typical: 75-80%
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Design Results
Tendon Summary
Tendons (length direction):90
Tendons (width direction):90
Total Tendons:180
Force per Strand:33.05 kips
Total Strand Length:5400 ft
Precompression
Avg Precompression:46 psi
Outside target range (125-300 psi)
Load Balancing
Max Drape:2.50 in
Balanced Load:6.1 psf
Self Weight:100.0 psf
Total Load:250.0 psf
Net Unbalanced:243.9 psf
Losses & Materials
Friction Loss:7.4%
Effective Force/Strand:30.62 kips
Concrete Volume:22.2 CY
Strand Weight:2835 lbs
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.