Paint Calculator

Estimate paint quantity from surface area, coats and paint coverage. Enter your own values below to see paint required and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Litres = net area × coats ÷ coverage per litre × (1 + extra allowance).

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What is Paint Calculator?

Paint Calculator helps you estimate paint quantity from surface area, coats and paint coverage.

The main result is paint required. The formula, example and assumptions below explain how to interpret it.

How to use Paint Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather net paintable area (m²), number of coats, coverage per litre per coat (m²/litre) and extra allowance (%). Use values from the same situation or reporting period.
  2. Replace the example net paintable area with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read paint required. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter net paintable area in m², at least 0. Decimals are accepted.
  • Enter number of coats, at least 1 and at most 20. Use a whole number.
  • Enter coverage per litre per coat in m²/litre, at least 0.001. Decimals are accepted.
  • Enter extra allowance in %, at least 0 and at most 100. Decimals are accepted.

Paint Calculator: a worked example

With the inputs below, the result is 22 litres (paint required). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Net paintable area (m²)100 m²
Number of coats2
Coverage per litre per coat (m²/litre)10 m²/litre
Extra allowance (%)10 %
Paint required22 litres

Understanding the Paint result

The main output is paint required, expressed in litres. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Paint Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Keep dimensions in the displayed units and distinguish usable area from built-up area. Material estimates need a suitable allowance for site conditions and waste.

For wider guidance, visit Bureau of Indian Standards. The formula and scope of this specific tool are stated on this page.

Paint Calculator FAQs

What does Paint Calculator calculate?

Paint Calculator helps you estimate paint quantity from surface area, coats and paint coverage. Its main output is paint required in litres.

What inputs do I need for Paint Calculator?

You need net paintable area (m²), number of coats, coverage per litre per coat (m²/litre) and extra allowance (%). Use the field labels and units to match your figures to the formula.

Which formula does Paint Calculator use?

Litres = net area × coats ÷ coverage per litre × (1 + extra allowance).

What is a worked example for Paint Calculator?

Example inputs: Net paintable area: 100 m²; Number of coats: 2; Coverage per litre per coat: 10 m²/litre; Extra allowance: 10 %. The result is 22 litres (paint required).

How should I enter net paintable area?

Enter net paintable area in m², at least 0. Decimals are accepted.

How do I choose number of coats?

Enter number of coats, at least 1 and at most 20. Use a whole number. The example uses 2; replace it if your circumstances differ.

How should I read paint required?

The main output is paint required, expressed in litres. It applies to the inputs and operation you selected.

Why might my Paint Calculator result differ from my records?

Keep dimensions in the displayed units and distinguish usable area from built-up area. Material estimates need a suitable allowance for site conditions and waste. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Paint Calculator?

Yes. Note your first paint required, change net paintable area or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Paint Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.