Garage Door Calculator
Estimate garage door area, cost, and track length
Width of the garage door opening
Height of the garage door opening
Select the style of garage door
Estimated Cost
—
USD
Track Length
—
ft
Door Area
—
sq ft
Door Type
—
type
Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.
How to Use This Calculator
Replacing or installing a garage door? Our calculator figures door area, a cost estimate, and the vertical track length you'll need based on the opening and door type.
- Measure the opening width and height
- Select the garage door type
- Enter values in the calculator
- Verify headroom clearance for tracks and springs
Expert Insights
Smart analysis for your Garage Door project
Type & Headroom Matching
Sectional doors need 12" of headroom, roll-ups as little as 6-8". AI matches the door type to your available clearance.
Track Length Sizing
Vertical track runs roughly twice the opening height plus 3 ft for the curve. AI sizes track and flags low-ceiling installs.
Insulation & Cost
Insulated R-12+ doors cost 30-60% more but cut garage heat loss sharply. AI weighs upfront cost vs. energy savings.
Calculation Formula
Door area = Opening width x Opening height
Estimated cost = ceil(Door area x $35/sq ft)
Track length = Opening height x 2 + 3 ft
(Type multipliers: Sectional 1.0, Roll-up 1.3, Tilt 0.9)
Garage Door Type Comparison
| Door Type | Headroom Needed | Cost per Sq Ft | Maintenance | Best For |
|---|---|---|---|---|
| Sectional | 12 in | $30-40 | Medium | Most homes |
| Roll-up (Coiling) | 6-8 in | $40-55 | Low | Low clearance, commercial |
| Tilt-up (Canopy) | Minimal | $25-35 | Low | Detached garages |
| Custom Wood Sectional | 12-15 in | $60-120 | High | High-end homes |
Authority References
Our calculations are based on guidelines and standards from these authoritative sources:
- Door & Access Systems Manufacturers Association (DASMA) — Garage Door Installation & Safety Standards. Learn more
- International Residential Code (IRC) — Section R309 — Garages & Carports. Learn more
- Underwriters Laboratories (UL) — UL 325 Garage Door Operator Safety Standard. Learn more
Frequently Asked Questions
What are standard garage door sizes?
Standard single garage doors are 8 or 9 feet wide by 7 feet tall. Double doors are 16 feet wide by 7 feet tall. Custom heights of 8 feet are common for trucks and RVs.
How much does a garage door cost installed?
A standard steel sectional garage door costs $700-$1,500 installed. Insulated doors run $1,000-$2,500, and custom wood doors can exceed $3,000-$5,000.
How much headroom is needed for a garage door?
Sectional doors need at least 12 inches of headroom above the opening for tracks and springs. Roll-up doors need as little as 6-8 inches, making them ideal for low clearance.