Carpet Calculator
Calculate carpet square footage and cost for your rooms.
Last updated: June 13, 2026
Calculator
Results
At $4/sq ft
How to Use This Calculator
- 1Enter the room length in feet.
- 2Enter the room width in feet.
- 3Enter carpet price per square foot.
- 4View total area, carpet with waste, and estimated cost.
Formula Explanation
Carpet area is calculated from room dimensions with a 10% waste factor added for seams, cuts, and pattern matching.
Variables:
Worked Examples
15×12 ft room, $4.50/sq ft carpet
- 1. Area = 15 × 12 = 180 sq ft
- 2. With 10% waste = 198 sq ft
- 3. Cost = 198 × $4.50 = $891
Why Use This Calculator
- Calculate exact carpet needs.
- Budget accurately with waste factor included.
- Avoid costly overages or shortages.
- Compare pricing between products.
Tips & Best Practices
- Budget an additional $2-4/sq ft for installation labor.
- Padding costs $0.50-1.50/sq ft extra and significantly affects carpet feel and longevity.
- Carpet typically comes in 12-foot wide rolls — rooms wider than 12ft will have seams.
- Buy all carpet from the same dye lot to ensure color matching.
Common Mistakes to Avoid
❌ Not including waste in your calculation.
✅ Always add 10% for waste from cuts, doorways, and closets. Complex room shapes may need 15% waste.
❌ Forgetting installation and padding costs.
✅ The carpet itself is only part of the cost. Add $3-6/sq ft for padding and professional installation.
Frequently Asked Questions
How much does carpet installation cost?
How much extra carpet should I order?
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<iframe src="https://redicalc.com/embed/home/carpet-calculator" width="100%" height="600" style="border:none;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.1);" title="Carpet Calculator — RediCalc.com" loading="lazy" allowtransparency="true"></iframe>Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.
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