# Waterproofing Calculator

Plan coating or membrane quantities from product specifications.

[Open this tool](https://whatson.pk/waterproof-calculator/)

Category: Construction

Waterproofing quantities depend on whether the system is a coating or a membrane, and on the product's stated coverage.

Measure the full treatment area, including details that need coverage, then use the selected system's specifications. Keep the material estimate tied to that product.

## Inputs and controls

* Area. Allowed range: 0.001 to 1000000000
* Area unit: Square feet; Square metres
* System: Liquid coating; Sheet membrane
* Coats. Allowed range: 1 to 10
* Consumption per coat (kg/m²). Allowed range: 0.01 to 50
* Container mass (kg). Allowed range: 0.01 to 1000
* Roll length (m). Allowed range: 0.1 to 1000
* Roll width (m). Allowed range: 0.1 to 100
* Overlap allowance on both axes (m). Allowed range: 0 to 10
* Ordering allowance (%). Allowed range: 0 to 100. Added once to the measured requirement.
* Container or roll price (PKR / unit). Allowed range: 0 to 1000000000. Optional. Enter your own supplier quote.

## How to use

* Choose area unit and system. Enter area.

* Enter coats, consumption per coat and container mass.

* Enter roll length, roll width and overlap allowance on both axes.

* Enter ordering allowance and container or roll price.

* Select Calculate estimate. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

The system choices help separate coating consumption from membrane coverage when comparing a waterproofing purchase.


## Before relying on the result

Select quantities from the product specification. Details, upstands and penetrations must be included in net treatment area.


## Tool limitations

Select quantities from the product specification. Details, upstands and penetrations must be included in net treatment area.

## Questions

### Should upstands and penetrations be included?

Include their treatment area where the specification requires it. A floor footprint alone can miss vertical returns and detailed work.

### What should I check before using Waterproofing Calculator?

Check Area, Area unit, System and Coats. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-01T14:08:57+00:00

This profile describes the tool. It does not execute it or supply a professional certification.