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Span Calc

Span Calc

Span calculator using NDS®

15 ratings
27 reviews
🔧 Utilities
💼 Business
Free

Details

  • Released
  • Updated
  • July 9, 2010
  • October 1, 2025

Features

Developer

American Wood Council
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About

Calculate maximum horizontal spans for wood joists and rafters using various lumber species and grades. Compares multiple options for common loading conditions based on NDS® standards.

✓Calculates joist and rafter spans
✓Supports all softwood and hardwood lumber
✓Uses 2021 NDS® for Wood Construction
✓Compares multiple species and grades
✓Handles common loading conditions
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What's New in Span Calc

2.16.8

October 1, 2025

FIX : Application error when selecting short penny weight nails

User reviews

Most RecentHighest RatedLowest Rated

Works great!

Seems to work just fine for us. Use it all the time, very smooth, doesn’t freeze up at all. Running on iPhone 17 Pro.
KBSBUILDERKBSBUILDER

Fails to run

Fails to run on iOS 15.8.2 (iPhone 6s+) stopping on "Generating views…".
Joe MiramontiJoe Miramonti

Paul Catalano

Span calculator has worked like charm for years but it recent crashed and needs to fixed 04-17-24 Ben worked diligently to repair the app and now it back to functional and we couldn’t be happier 04-20-24
Pcat60Pcat60

Stopped working

New update messed up app
pweber17pweber17

Unusable since last upgrade

I have not been able to use the app this week. Something in the upgrade causes it to lock up.
Cabana a BoyCabana a Boy
See 22 more reviews

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FAQ

What lumber types does Span Calc support?

Span Calc supports calculations for all species and grades of commercially available softwood and hardwood lumber as found in the 2021 National Design Specification® (NDS®) for Wood Construction.

What loading conditions does Span Calc calculate for?

Span Calc calculates spans for combinations of dead load plus live load (D + L), dead load plus snow load (D + S), or dead load plus roof live load (D + Lr). It does not address wind or seismic loads.

Can Span Calc calculate spans for cantilevered or multiple-span joists?

No, Span Calc does not address cantilevered joists and rafters, multiple-span joists and rafters, or spliced joists and rafters. It is designed for single-span members with adequate support at each end.

What is the age rating for Span Calc?

Span Calc has an age rating of 17+, indicating it is intended for mature users, likely due to the technical nature of its calculations and the construction industry context.

How often is Span Calc updated?

The latest version of Span Calc is 2.16.8, which was last updated on October 1, 2025. This suggests a relatively active development cycle for the application.

What devices is Span Calc available on?

Span Calc is available on iPhone, iPad, and iPod devices, making it accessible to a wide range of Apple users.

What is the user sentiment for Span Calc based on its rating?

Span Calc has a rating of 2.9 stars from 15 ratings. This indicates a mixed to slightly negative user sentiment, suggesting potential areas for improvement or user dissatisfaction.

Does Span Calc require an internet connection to function?

The provided data does not specify whether Span Calc requires an internet connection. However, as a calculation tool based on established standards, it is likely to function offline.