Carpet Area Calculator – Calculate Carpet Area from Built-Up Area
Calculate the carpet area of a flat or house from built-up or super built-up area using standard ratios with our free carpet area calculator. Understand exactly how much usable space you're getting. Essential for home buyers in India.
Real estate listings use different area measurements. Understanding these terms helps you know exactly how much usable space you're paying for.
Area Definitions
Carpet Area
Actual usable floor area where you can lay carpet. Excludes walls, balconies, and common areas.
Built-Up Area
Carpet area + wall thickness + utility ducts. Typically 10-15% more than carpet area.
Super Built-Up Area
Built-up area + proportionate share of common areas (lobby, stairs, elevator, amenities). Also called "saleable area".
Typical Deduction Ratios
| Property Type | From Super Built-Up | From Built-Up |
|---|---|---|
| Apartment | 25% deduction | 10% deduction |
| House | 15% deduction | 5% deduction |
| Commercial | 30% deduction | 15% deduction |
Example Calculation
Super Built-Up Area: 1,500 sqft (Apartment)
Carpet Area = 1,500 × (1 - 0.25) = 1,125 sqft
Efficiency = 1,125 / 1,500 = 75%
Enter values and calculate to see the chart
- Always ask for carpet area, not just super built-up area
- Compare properties using carpet area for accurate comparison
- Higher efficiency ratio means more usable space for your money
- Apartments typically have 70-75% efficiency
- Independent houses have 85-90% efficiency
- RERA mandates disclosure of carpet area in India
How to Calculate Carpet Area from Built-Up Area
Choose Calculation Mode
Select whether you want to calculate from super built-up area or built-up area.
Select Property Type
Choose apartment, independent house, or commercial property for accurate ratios.
Get Carpet Area
See your usable carpet area along with efficiency ratio and area comparison chart.
Why Calculate Carpet Area?
🏠 Know Your Usable Space
Carpet area is the actual floor space you can use. Understanding this helps you compare properties fairly.
📊 RERA Compliance
In India, RERA mandates carpet area disclosure. This calculator helps verify builder claims.
💰 Fair Price Comparison
Compare properties based on carpet area price per sqft, not misleading super built-up rates.
📈 Efficiency Analysis
See what percentage of the saleable area is actually usable space in your property.
Area Deduction Ratios by Property Type
| Property Type | From Super Built-Up | From Built-Up | Typical Efficiency |
|---|---|---|---|
| 🏢 Apartment/Flat | 25% deduction | 10% deduction | 70-75% |
| 🏡 Independent House | 15% deduction | 5% deduction | 85-90% |
| 🏬 Commercial/Office | 30% deduction | 15% deduction | 65-70% |
Carpet Area FAQs
What is the difference between carpet area and built-up area?
Carpet area is the usable floor space inside walls. Built-up area includes carpet area plus wall thickness and utility ducts, typically 10-15% more.
What is super built-up area?
Super built-up area (saleable area) includes built-up area plus your share of common spaces like lobby, stairs, elevator, and amenities. It's 25-30% more than carpet area for apartments.
How is carpet area calculated under RERA?
RERA defines carpet area as net usable floor area excluding external walls, balconies, and common areas. Builders must quote prices based on carpet area in India.
What is a good efficiency ratio for apartments?
A good efficiency ratio is 75% or higher, meaning 75% of the super built-up area is usable carpet space. Lower ratios mean you're paying for more common area.
Should I buy based on carpet area or super built-up?
Always compare properties using carpet area. A 1000 sqft super built-up apartment may have only 750 sqft carpet area, affecting value comparison.
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