How much solution does a carpet extractor use per square metre?

A portable extractor typically uses 0.1-0.2 litres per m², while a truckmount uses 0.15-0.25 litres per m². Encapsulation machines use much less — around 0.05-0.1 litres per m². Heavily soiled carpets require more solution.

Should I always pre-spray carpets?

Yes, for most jobs. Pre-spraying allows the cleaning chemical to dwell on the carpet fibres and break down soil before extraction. It significantly improves cleaning results, especially on moderate to heavily soiled carpets. Skip it only for very light maintenance cleans.

What dilution ratio should I use?

Always follow the manufacturer recommendation on the chemical label. Common ratios are 1:20 for heavy soil, 1:40 for standard cleaning, and 1:80 for maintenance. Using too much chemical can leave residue that attracts dirt faster.

Can I mix different cleaning chemicals?

Never mix different cleaning chemicals unless the manufacturer specifically says it is safe. Mixing can create toxic fumes, reduce effectiveness, or damage carpets. If switching chemicals, rinse the machine tank thoroughly first.

CleanCalcs

Carpet Cleaning Solution Calculator

Calculate the volume of cleaning solution needed for carpet extraction cleaning.

Carpet Area

Total carpet area to clean

Machine Type

Soil Level

Dilution Ratio (1:X)

Check chemical label

Include pre-spray

Add pre-spray volume at 50ml/m²

How We Calculate This

This calculator estimates solution volume based on carpet area, machine type and soil level.

Application rates (litres per m²)

Portable extractor: 0.15 L/m²
Truckmount: 0.20 L/m²
Encapsulation: 0.08 L/m²

Formula

Total solution = area × application rate × soil multiplier

Chemical = total solution ÷ (dilution ratio + 1)

Pre-spray is calculated at 50ml per m² when enabled.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities and timings for your specific situation.