Property Size / Area Calculator

Two apartments can both be advertised as "2,000 sq ft" and yet genuinely differ - one gives you 1,450 sq ft of room and the other only 1,250 sq ft. The gap is loading: the percentages that get added on as your quote moves from carpet area up to the saleable super built-up area the builder prices.

Property Size / Area Calculator converts between carpet area, built-up area and super built-up area with configurable wall and common-area loading. Convert forward from carpet to see exactly what a quoted number includes, or convert in reverse to recover the true usable carpet area from any advertised super built-up figure.

Enter your preferred loading percentages (or use the common 10-15 percent wall and 20-35 percent common defaults), add the price to compare cost per square foot of each basis, and see the whole chain - carpet, built-up, super built-up - in one table. Everything runs in the browser; nothing is uploaded.

• Forward & reverse: Convert carpet to super built-up, or enter a saleable figure and recover the carpet area.
• Configurable loading: Independent wall loading and common-area loading, with realistic defaults and presets.
• Three basis areas: Carpet, built-up and super built-up reported in both sq ft and sq m simultaneously.
• Price-aware: Enter a price to compare cost per sq ft on each area basis - including true carpet cost.
• Unit flexibility: Enter any area in sq ft or sq m; all outputs shown in both.
• Live estimate: Every number updates as you type, with the conversion chain shown step by step.
• Export: Copy or download the comparison as text, CSV or JSON for your spreadsheet.
• Learning guide: What each area means, why loading exists, and how to compare apartments honestly.

1. Pick the direction. Carpet to super built-up (you know the usable area) or super built-up to carpet (you were quoted a saleable figure).
2. Enter the base area. The carpet area or the saleable super built-up area, in sq ft or sq m.
3. Set the loadings. Wall loading ~10-15 percent; common-area loading ~20-35 percent. Use builder figures when you have them.
4. Add the price (optional). The total price to see cost per sq ft on every basis.
5. Read the chain. Carpet, built-up and super built-up areas appear with the loading applied.
6. Review the working. Each loading step is shown so you can verify the builder math.
7. Export. Copy or download as text, CSV or JSON.
8. Compare fairly. Run two properties the same way and compare recovered carpet areas.

Example 1 - Forward. Carpet area 1,200 sq ft with 12 percent wall and 25 percent common loading: built-up = 1,344 sq ft, super built-up = 1,680 sq ft.

Example 2 - Reverse. Quoted 1,800 sq ft super built-up with the same loadings recovers a carpet area of about 1,286 sq ft - the real room you get.

Example 3 - Price basis. A 60 lakh price on 1,680 sq ft exceeds 1,200 carpet sq ft at ~3,571 vs ~5,000 per sq ft of carpet.

Example 4 - Low vs high loading. The same carpet area with 35 percent instead of 20 percent common loading reduces recovered usable area and inflates the advertised size.

Example 5 - Compare two flats. Flat A at 1,600 sq ft saleable and Flat B at 1,500 sq ft saleable - reverse convert both to carpet to see which is genuinely bigger.

• Know the real room: Recover actual carpet area from any advertised saleable number.
• Fair price comparisons: Cost per sq ft of carpet is the truthful basis - use it to negotiate.
• Understand the quote: See exactly what loading the builder applied between area levels.
• Consistent comparisons: Standardise different projects on the same basis.
• Explainable math: Each loading step is shown, so nothing is a black box.
• Export-ready: Text, CSV and JSON outputs drop into your spreadsheets.
• Free and private: No uploads, no accounts, no logging.