🔨 निर्माण और DIY

पेंट कवरेज कैलकुलेटर (लीटर / गैलन)

ठीक-ठीक ज़रूरी पेंट की गणना करें: दरवाज़ों और खिड़कियों को घटाकर दीवार क्षेत्रफल, कोट और प्राइमर से गुणा, साथ ही सतह बनावट कवरेज फैक्टर और ब्रांड-विशिष्ट m²/L।

यूनिट्स

कोट्स

सतह की बनावट

प्राइमर

छत शामिल करें?

कमरे

नाम	L	W	ऊंचाई	दरवाज़े	खिड़कियां

आवश्यक पेंट

0 gal

दीवार क्षेत्रफल — · प्राइमर —

कमरा	दीवार क्षेत्रफल	नेट क्षेत्रफल

गणित कैसे काम करता है

प्रति कमरा दीवार क्षेत्रफल: 2 × (L + W) × ऊंचाई। वैकल्पिक रूप से छत जोड़ें = L × W।

ओपनिंग्स घटाएं: प्रति दरवाज़ा 21 sqft, प्रति खिड़की 15 sqft (≈ 1.95 m² और 1.4 m²)।

आवश्यक पेंट: total_net_area × coats / coverage_per_gal। कवरेज सतह की बनावट पर निर्भर करती है: स्मूद 350, हल्की 300, भारी 250 sqft/gal।

प्राइमर: सभी सतहों पर ~200 sqft/gal की एक कोट। हमेशा पूरे कंटेनर तक राउंड अप करें।

गणित कैसे काम करता है

The calculator works room by room. For each row it takes wall area as 2 × (length + width) × height, optionally adds length × width for the ceiling, then subtracts a flat 21 square feet per door and 15 square feet per window to get net paintable area. Totals across all rooms are multiplied by your coat count and divided by the coverage rate, and the answer is rounded up to whole containers, because you cannot buy two-thirds of a tin.

Surface texture is the coverage rate, and it is the biggest single lever: Smooth gives 350 sqft/gal, Light texture 300 and Heavy texture 250, so a heavily textured wall needs 40 percent more paint than a smooth one for the same area. Coats defaults to 2 and accepts 1 to 5. Turning Primer on adds a separate single coat costed at 200 sqft/gal, reported alongside the topcoat figure rather than mixed into it.

The opening deductions are fixed averages, not measurements: every door counts as 21 sqft and every window as 15 sqft regardless of the real size or the unit system you selected. Trim, doors themselves, closets and soffits are not counted. Metric mode computes in square feet and gallons internally and converts at 3.78541, then rounds to whole litres — which will not line up with the 2.5 and 5 litre tins actually sold, so round to real tin sizes yourself.

सामान्य प्रश्न

How much paint do I need for a 12 by 12 foot room?

With 8 foot ceilings that is 384 sqft of wall. Deduct one door and one window and you get 348 sqft net; two coats at the smooth 350 sqft/gal rate works out to 1.99 gallons, which the tool rounds up to 2 gallons.

Do I have to subtract windows and doors myself?

No. Each room row has Doors and Windows count fields. Enter how many of each and the tool removes 21 sqft per door and 15 sqft per window automatically. If a room has an oversized picture window, enter it as two windows to approximate the area.

Does the estimate cover the ceiling as well as the walls?

Only if you set Include ceiling to Yes, which adds length × width to every room's area. It is off by default, and it uses the same texture coverage rate as the walls, so adjust the texture setting if your ceiling is a different finish.

How many coats should I plan for a big colour change?

Keep coats at 2 and switch Primer on. Primer is costed separately as one coat at 200 sqft/gal, which is the standard approach for going dark to light, over patched drywall, or onto bare or glossy surfaces where topcoat alone will not sit evenly.

Why did the total jump a whole gallon after a small edit?

Because the result is rounded up to whole containers. Adding a few square feet can push 1.98 gallons to 2.01 and force a third tin. The per-room table below the result shows the underlying gross and net areas so you can see what actually moved.

इन नामों से भी जाना जाता है

paint calculatorhow much paint do i needpaint coverage calculator

पेंट कवरेज कैलकुलेटर (लीटर / गैलन)

गणित कैसे काम करता है

सामान्य प्रश्न

इन नामों से भी जाना जाता है

संबंधित टूल्स