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Ridge Vent Length Calculator
Work out ridge vent length from attic ventilation needs.
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Vent length
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Work out ridge vent length from attic ventilation needs.
Ridge Vent Length Estimator
Enter your numbers below for an instant estimate.
0
π‘ Tip: Typical ventilation is 1 sq ft per 300 sq ft of attic.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Ridge Quick Guide
Typical values for reference.
| Attic | Total NFA | Ridge vent | Note |
|---|---|---|---|
| 1000 sq ft | 480 sq in | 20 ft | Small |
| 1500 sq ft | 720 sq in | 30 ft | Typical |
| 2000 sq ft | 960 sq in | 40 ft | Large |
| 3000 sq ft | 1440 sq in | 60 ft | Big |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Ridge Vent Length Calculator FAQ
Answers to common questions about this calculator.
Enough net free area for half the attic ventilation.
It gives a quick estimate of ridge vent length from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.