RAJUK FAR Calculation: What Can You Build on Your Land?
Level Seven Architecture & Construction | Location: Banani, Dhaka | Phone: +8801714302055 | Service area: Dhaka, Bogra, Rajshahi, Rangpur, Mymensingh, & other regions of Bangladesh.
This is a free RAJUK FAR Calculator built by Level Seven Architecture & Construction. Find out how much you can build on your plot before you spend a single taka on design. This free calculator uses RAJUK's DAP 2022-2035 rules and the 2025 Bidhimala (2008 for areas outside RAJUK enlisted) to estimate your Floor Area Ratio (FAR), maximum floor area, likely floor count, apartment allowance, and the setbacks you'll need to leave around your building.
RAJUK FAR Calculation in Dhaka: Formula, Rules and Examples
FAR (Floor Area Ratio) is the floor area you can build divided by your plot area. In Dhaka, RAJUK sets your allowable FAR as the lower of your Plot FAR (from road width and building use) and Area FAR (from your locality), plus incentives, capped at the higher of the two. Allowable FAR times plot area gives your buildable floor area.
What is FAR in RAJUK rules?
FAR, or Floor Area Ratio, is the ratio of a building’s total floor area to its plot area. A 3,600 sqft plot with an allowable FAR of 3.5 can hold 12,600 sqft of floor area across all floors. RAJUK uses FAR to limit how much you can build on a plot in Dhaka.
How to calculate FAR in Dhaka, step by step
Convert your plot to square feet. One katha is 720 sqft, so 5 katha is 3,600 sqft.
Find your Plot FAR from your road width, building use and area type.
Find your Area FAR from the density block of your locality, such as Bashundhara, Uttara or Mirpur.
Take the lower of the two as your Base FAR.
Add the incentives you qualify for, then cap the total at the higher of Plot FAR and Area FAR.
Multiply the allowable FAR by your plot area to get your total floor area.
Plot FAR by road width (apartment buildings, central Dhaka)
Plot FAR rises with the road in front of your plot. These values come from the calculator for an apartment building:
10 to 12 ft road: 1.75
16 ft road: 2.0
20 ft road: 3.258
25 ft road: 3.385
30 ft road: 3.524
40 ft road: 4.008
60 ft road: 4.274
Values between these widths rise gradually. Moving from a 16 ft to a 20 ft road lifts Plot FAR from 2.0 to about 3.26, which is why road width matters so much for plots in Mohammadpur, Mirpur, Rampura and similar areas.
Area FAR of popular Dhaka localities
Area FAR comes from your locality’s density block. These are the values the calculator uses:
Gulshan and Banani: 5.5
Dhanmondi: 5.0
Mirpur DOHS: 4.8
Baridhara and Uttara phase 3: 4.7
Uttara phases 1 and 2, and Purbachal: 4.5
Bashundhara residential: 4.1
Aftabnagar and Banasree: 3.7
Rampura: 3.6
Mirpur, Mohammadpur, Badda and Basabo-Khilgaon: 3.4
This is Area FAR only. Your allowable FAR also depends on your road width and incentives.
FAR incentives under the 2025 rules
Plot size: 0.20 for 3 to under 6 katha, 0.35 for 6 to under 10, 0.50 for 10 to under 15, 0.65 for 15 to under 20, and 0.75 for 20 katha and above.
Wide road: 0.02 for every foot of road width above 30 ft, up to 1.0.
Green building: up to 0.50, with a certificate.
Affordable housing with an apartment building: up to 0.50 for plots of 10 katha and above with five affordable units, or up to 0.75 with 5% of floor space for plots of 20 katha and above.
Transit-oriented development, FAR purchase and public-space bonuses need separate documents and approval.
Worked example 1: 5 katha in Bashundhara, 25 ft road
Plot FAR is 3.385 and Area FAR is 4.1, so Base FAR is 3.385. The plot-size incentive adds 0.2, giving 3.585, below the 4.1 ceiling. Floor area: 3,600 × 3.585 = 12,906 sqft. Ground coverage of 46.5% to 62.5% gives G+6 to G+8, and 5 katha × 2 units per katha gives 10 flats, up to 11 with RAJUK approval.
Worked example 2: 3 katha in Mirpur, 20 ft road, when the ceiling applies
Plot FAR is 3.258 and Area FAR is 3.4, so Base FAR is 3.258. The plot-size incentive adds 0.2, giving 3.458, but the ceiling is 3.4, so allowable FAR is 3.4. Floor area: 2,160 × 3.4 = 7,344 sqft. Ground coverage of 50% to 67.5% gives G+6 to G+7, and 3 katha × 1.9 = 5.7 units, which rounds down to 5 flats; RAJUK can approve up to 10% more (5.7 × 1.1 = 6.3), so up to 6.
Worked example 3: 7 katha in Birulia, 60 ft road, when Plot FAR is higher
Area FAR is 2.4 and Plot FAR (outer-area table) is 3.774, so Base FAR is the lower value, 2.4. The plot-size incentive adds 0.35 and the wide-road incentive adds 0.6 (30 ft above 30 ft), giving 3.35, below the 3.774 ceiling. Floor area: 5,040 × 3.35 = 16,884 sqft, which is G+6 to G+8.
How many floors, how much ground coverage and how many flats?
Number of floors = total floor area ÷ floor footprint, rounded up. Because a wide, short building and a narrow, tall one can use the same floor area, the calculator shows a range such as G+6 to G+8. Flats = plot area in katha × units per katha for your density block, and RAJUK can approve up to 10% more. These are planning estimates. Height limits, fire access and approval can change them.
Building outside Dhaka?
Bogura, Rajshahi, Rangpur and Mymensingh are outside RAJUK. Choose “Outside RAJUK Area” in the calculator for a reference estimate based on the 2008 rules, then confirm with your local authority.
ফার হিসাব (FAR Calculation) সংক্ষেপে
ফার (FAR) বা ফ্লোর এরিয়া রেশিও হলো ভবনের মোট ফ্লোর এরিয়াকে প্লটের আয়তন দিয়ে ভাগ করলে পাওয়া অনুপাত। ঢাকায় প্লট ফার (রাস্তার প্রস্থ ও ভবনের ধরন অনুযায়ী) এবং এরিয়া ফার (এলাকা বা ডেনসিটি ব্লক অনুযায়ী)-এর মধ্যে যেটি কম, সেটি বেজ ফার। এর সাথে প্রণোদনা যোগ হয়, তবে মোট ফার প্লট ফার ও এরিয়া ফারের বেশিটির চেয়ে বেশি হতে পারে না। অনুমোদিত ফারকে প্লটের আয়তন দিয়ে গুণ করলে মোট কত বর্গফুট ফ্লোর এরিয়া বানানো যাবে তা জানা যায়। এক কাঠা = ৭২০ বর্গফুট।
Once you know your total floor area, the next steps are design, cost and approval. Our architectural design firm in Dhaka turns your FAR into a working floor plan, the construction cost per sqft in Dhaka guide shows what your building will cost, and a BOQ and cost estimate fixes the budget before you build. Planning a family home? See duplex house design in Bangladesh, and when the drawings are ready, our building construction company in Dhaka can build it.
Use the calculator above, then bring your numbers to Level Seven Architecture & Construction in Banani, Dhaka. This is a planning estimate based on the Dhaka Metropolitan Building Rules 2025 (SRO 469-Law/2025) and the DAP 2022-2035 amendment (SRO 468-Law/2025), last reviewed on 3 October 2026. It does not replace RAJUK approval. Message us on WhatsApp at +8801714302055 for RAJUK plan approval and design.
What is FAR, and why does it matter?
FAR determines the single biggest number in your entire project: how much you're actually allowed to build. It's your plot area multiplied by an allowable ratio that RAJUK sets based on your road width, your locality's density block, and what you're building.
How does this calculator work?
Enter your plot size, the road width in front of it, and your locality. Pick the picture that matches your plot's shape and road position. Tell us what you're planning to build. In seconds, you'll see your FAR, estimated floor count, apartment allowance, and the clear space required on all four sides, broken down so you can see exactly how each number was reached, not just a final figure.
Is this RAJUK FAR calculator free to use?
Yes. You can calculate your estimate for free without creating an account.
Is this an official RAJUK approval tool?
No. This is a preliminary planning estimate based on publicly available RAJUK regulations. It does not replace official RAJUK approval or verification by a licensed architect or engineer.
Does this calculator work outside RAJUK areas?
Yes, in a limited way. Choose "Outside RAJUK Area" to get a reference estimate based on the 2008 building rules. Local authorities may apply their own rules, so confirm them before relying on the figures.
How much FAR do I get on a 5 katha plot in Dhaka?
It depends on road width and locality. A 5 katha apartment plot on a 25 ft road in Bashundhara, where Area FAR is 4.1, gets an allowable FAR of 3.585, or 12,906 sqft of floor area.
Which FAR applies in Dhaka, Plot FAR or Area FAR?
Both are used. The lower one is your Base FAR, and your total with incentives can never go above the higher of the two.
Why does the calculator show a range of floors?
Within the same allowed floor area, a building can use a wider footprint with fewer floors or a smaller footprint with more floors. The calculator shows both ends, based on the minimum and maximum ground coverage allowed for your plot.
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