Soil liquidity index calculator

Calculate liquidity index and consistency index with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use liquidity index and consistency index to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Natural water content (%)
30
Liquid limit (%)
45
Plastic limit (%)
25
Liquidity index
0.25
Consistency index
0.75

Try another scenario

Natural water content (%)
31
Liquid limit (%)
45
Plastic limit (%)
25
Liquidity index
0.3
Consistency index
0.7
Calculation method

Calculation method

Liquidity index

Liquidity=(w−PL)/(LL−PL), consistency=(LL−w)/(LL−PL); LL must exceed PL.

Consistency index

Liquidity=(w−PL)/(LL−PL), consistency=(LL−w)/(LL−PL); LL must exceed PL.

Symbols and units
a
Natural water content (%)
b
Liquid limit (%)
c
Plastic limit (%)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Liquidity=(w−PL)/(LL−PL), consistency=(LL−w)/(LL−PL); LL must exceed PL. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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