How does the bathroom waterproofing calculator work?

It first finds your coatable area, which is the floor area plus a wall band. The band is the room perimeter multiplied by the height you take the membrane up the walls. It then multiplies that area by the coverage rate of the chosen system, by the number of coats, and adds a wastage percentage to give the material quantity in kilograms or litres, plus an indicative material and labour cost.

What inputs and values should I use?

Enter the room length and width in feet, or the floor area directly, and the wall-band height in millimetres. A skirting band of 150 to 300 mm is typical everywhere, while a shower zone is often taken full-height at 1800 mm or more. Choose the system, set two coats as a common default, and keep wastage near 10 percent for a normal bathroom, higher for rough or porous surfaces.

Waterproofing Calculator

Bathroom Waterproofing Calculator

Enter your bathroom size and how far up the walls you are taking the membrane. Get the coatable area, material to buy in kg or litres and an indicative ₹ cost across cementitious, acrylic, PU and SBR systems. Indicative India 2026 — always confirm with your applicator.

Your bathroom & system

Room length (ft)

Room width (ft)

Perimeter (ft, auto)

Wall-band height (mm)

Waterproofing system

Number of coats

Wastage %

Rigid, most common for wet areas & sunk slabs. Coverage 1.5 kg/m² per coat @ ₹110/kg; labour ≈ ₹280/m². Take the membrane up 150–300 mm as skirting everywhere, and full-height (1800 mm+) inside shower zones. Detail drains, corners and pipe sleeves with fillets and reinforcing tape.

Indicative total cost

₹0

that is 0.0 kg of material over 2 coats (≈ ₹60/sq ft applied)

Coatable area

59 sq ft

5.4 m² · floor + walls

Material needed

18 kg

8.2 kg/coat + 10% waste

Material cost

₹1,977

@ ₹110/kg

Labour cost

₹1,525

@ ₹280/m² applied

Material vs labour split for a 59 sq ft coatable area. Indicative — confirm with your applicator.

Get the system & detailing right

Sense-check the system, coats and drain detailing with DesignAI.

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Estimates are indicative for India 2026 and vary by brand, substrate condition and site access. Coverage and coat counts must follow the product datasheet — porous or rough surfaces soak up more material. Labour rates exclude surface preparation, screed, protection screed and drainage work. Always confirm quantities, the number of coats and warranty terms with your applicator before ordering.

Frequently asked questions

How does the bathroom waterproofing calculator work?: It first finds your coatable area, which is the floor area plus a wall band. The band is the room perimeter multiplied by the height you take the membrane up the walls. It then multiplies that area by the coverage rate of the chosen system, by the number of coats, and adds a wastage percentage to give the material quantity in kilograms or litres, plus an indicative material and labour cost.
What inputs and values should I use?: Enter the room length and width in feet, or the floor area directly, and the wall-band height in millimetres. A skirting band of 150 to 300 mm is typical everywhere, while a shower zone is often taken full-height at 1800 mm or more. Choose the system, set two coats as a common default, and keep wastage near 10 percent for a normal bathroom, higher for rough or porous surfaces.
How accurate is the estimate and what should I verify?: Treat the numbers as indicative for planning and budgeting, not a fixed quotation. Coverage rates and coat counts must follow the actual product datasheet, since porous or uneven surfaces soak up more material. Labour rates exclude surface preparation, screed and drainage. Confirm the system choice, coats, drain and corner detailing and warranty with your applicator, and follow wet-area practice under NBC 2016 Part 9.

Related Guides — Deep-dive reading

Cementitious Waterproofing India: Coatings, Coats & Cost (2026)

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Bathroom Waterproofing Chemicals in India: Compounds, Admixtures & Sealants

A brand-neutral guide to the integral compounds, crystalline admixtures, acrylic bonding agents, primers and PU/silicone sealants that keep an Indian bathroom dry — what each does, where it goes, dosage and ₹ cost.

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Bathroom Waterproofing Cost in India (2026): ₹ per Sq Ft by System, Materials + Labour

What bathroom waterproofing actually costs in India — ₹ per sq ft by system (cementitious, acrylic, PU, sheet), material vs labour split, sunken-portion vs full bathroom, new vs remedial leak repair, warranty-backed applicator premiums, and how to judge value instead of chasing the cheapest quote.

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