Back to all calculators

Everyday

Laundry detergent dosage calculator

Calculate detergent dosage from load size, soil level and water hardness.

Your result

Complete the fields and calculate.

Calculation method and formula

Package dose for 4.5 kg [ml] × Laundry load [kg] ÷ 4.5 × Soil level × Water hardness

Understand the inputs

Laundry load
Unit: kg. Minimum 0.5. Use a measured value or your own assumption.
Package dose for 4.5 kg
Unit: ml. Minimum 1. Use a measured value or your own assumption.
Soil level
Choose the matching option; it determines the table value or calculation variant.
Water hardness
Choose the matching option; it determines the table value or calculation variant.

Assumptions and limitations

Package dosage is the base; soil and hardness factors are simplified assumptions. Follow product instructions and your actual local water hardness.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Laundry load
5 kg
Package dose for 4.5 kg
70 ml
Soil level
Normal
Water hardness
Medium
Example result78 ml per wash

Guide value: also follow the dosage instructions on your detergent.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Laundry detergent dosage calculator work?+

Package dose for 4.5 kg [ml] × Laundry load [kg] ÷ 4.5 × Soil level × Water hardness. Package dosage is the base; soil and hardness factors are simplified assumptions. Follow product instructions and your actual local water hardness.

What assumptions should I consider for this result?+

Package dosage is the base; soil and hardness factors are simplified assumptions. Follow product instructions and your actual local water hardness. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

Related document on CleverDocuFree document templates and practical PDF tools – directly in your browser with no sign-up.