Deck Beam Span Calculator
Maximum beam span from section modulus.
Work It Out And Get Clear Answers
Maximum beam span from section modulus.
Deck Beam Span Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Press Calculate to see the result.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Deck Beam Span Quick Guide
Typical values for reference.
| Section modulus (inยณ) | Allowable bending stress (psi) | Load (psf) | Maximum beam span |
|---|---|---|---|
| 64.2 | 875 | 50 | 11.17 ft |
| 32.1 | 875 | 50 | 7.9 ft |
| 128.4 | 875 | 50 | 15.8 ft |
| 64.2 | 437.5 | 50 | 7.9 ft |
| 64.2 | 1,750 | 50 | 15.8 ft |
| Rule of thumb: check your inputs, use the result as a guide and round sensibly. | |||
Deck Beam Span FAQ
Answers to common questions about this calculator.
L = โ(8 ร S ร Fb รท (12 ร w)). Bending only; confirm with code tables.
It uses the default inputs shown and the formula described above. Change any value and press Calculate to see how the result moves.
It is an estimate based on the inputs you enter. Check real quotes, labels, product data or official guidance for important decisions.
Yes. Replace each input with your own figures and press Calculate to update the result.