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Dilution Ratio Calculator

Work out dilution ratio instantly with clear inputs, formula shown and shareable results.

About Dilution Ratio Calculator

A dilution written 1 : k means one part concentrate to k parts diluent, so the mixture has 1 + k parts in total and the concentrate is 1/(1 + k) of the final volume.

Formula

Dilution

concentrate = total / (1 + k), diluent = total × k / (1 + k)

Worked example

With the default values below, Dilution Ratio Calculator returns Concentrate needed of 0.454545. Change any input above and every figure here is recalculated in your browser.

Inputs used

Final volume requiredminimum 0
5
Parts of diluent per part concentrateminimum 0
10

Results

Concentrate needed
0.454545
Diluent needed
4.545455
Dilution ratio
1 : 10
Final concentration
9.090909 %

Step by step

  1. 1Values used
  2. 2Dilution
  3. 3Concentrate needed= 0.454545
  4. 4Diluent needed= 4.545455
  5. 5Dilution ratio= 1 : 10
  6. 6Final concentration= 9.090909 %

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 6 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

5 litres at 1 : 10?

Eleven parts of 0.454545 litres, so about 0.4545 litres of concentrate and 4.5455 litres of water — a 9.0909% solution.

Is 1 : 10 the same as a 10% solution?

No. 1 : 10 gives 1/11 ≈ 9.09%. A true 10% solution is a 1 : 9 dilution.

Related Calculators

Dilution Ratio Calculator – Calculate Concentrate needed