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Usable Area Ratio Calculator

Lifestyle Tools

Gross vs usable area, shared-area coefficient and true unit price

Quick Answer

Usable Area Ratio Calculator: Gross vs usable area, shared-area coefficient and true unit price. Usable Area Ratio Calculator uses standard everyday life formulas to compute accurate results instantly.

㎡
㎡
wan CNY
Usable ratio78%

Shared area 22 ㎡ · coefficient 0.282

Price per gross sqm 20,000 · per usable sqm 25,641 CNY/㎡

How it works

  1. 1Usable ratio = usable / gross area
  2. 278 ÷ 100 = 78%
  3. 3Shared area = gross - usable; coefficient = shared / usable
  4. 422 ㎡ · 0.2821
  5. 5Price per usable sqm is the fair comparison basis
  6. 625,641.03 vs 20,000 CNY per sqm

Reference range

Low-rise walk-up 85-90% · mid-rise with elevator 80-85% · high-rise 75-80% · towers with large lobbies 70-75%. Lower ratio means you pay more per usable sqm.

Shared area includes elevator shafts, stairwells, lobbies, equipment rooms and exterior walls (half). Developers report gross area; ask for the usable area of the exact unit. Gifted balconies/terraces are usually outside the gross area — confirm whether they appear on the deed.

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How to Use

  1. Enter scenario values: fill real-life numbers into the Usable Area Ratio Calculator (defaults work for a quick try).
  2. Instant results: everything computes live, no button needed.
  3. Read the advice: results come with practical tips, reference standards and pitfalls.
  4. Compare options: adjust parameters to compare choices side by side.

Key Points

  • Usable Area Ratio Calculator is a free online everyday life tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Gross vs usable area, shared-area coefficient and true unit price.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Usable Area Ratio Calculator formula

Usable Area Ratio Calculator uses standard everyday life formulas to compute accurate results instantly.

FAQ

How do I use the Usable Area Ratio Calculator?
Open the page and fill in the input fields — results update automatically. Gross vs usable area, shared-area coefficient and true unit price.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on common formulas and industry conventions. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Usable Area Ratio Calculator[EB/OL]. https://www.yijiansuan.com/en/c/life/floor-ratio

Results provided by this tool are for reference only and do not constitute professional advice.