What densities are required?

Enter bulk density and tapped density in the same units. The ratio and index are unitless, so any consistent density unit works.

What does Carr index indicate?

Carr index is a screening measure of powder compressibility based on the difference between tapped and bulk density.

Is the flowability class definitive?

No. It is a screening label. Particle shape, moisture, cohesion, and test method can change real handling behavior.

ToolsConductScience tool

Powder FlowFree in-browser calculator

Carr Index and Hausner Ratio Calculator.

Enter bulk and tapped powder density to calculate compressibility index, Hausner ratio, and screening flow class. For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

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Validated2026-05-24

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Try it out

Load example Carr index and Hausner ratio data to see the full workflow

Bulk and tapped density

Bulk density

Tapped density

Results

Carr index

23.529 %

Hausner ratio

1.3077

Density difference

0.16

Flow class

passable

0.52

0.68

Review notes

Flowability classes are screening labels; powder shape, moisture, and test method can change handling behavior.

Methods note

Carr index = (tapped density - bulk density) / tapped density * 100. Hausner ratio = tapped density / bulk density.

Scope and limitations

For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

Results are deterministic calculations from the values entered here. Review units, assumptions, and measurement quality before using outputs in reports or protocols.

Method

Uses the tool-specific formulas and assumptions shown in the calculator output.

Validated

Last validated 2026-05-24. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

How to cite

How to Cite

Carr Index and Hausner Ratio Calculator (1.2.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/carr-index-hausner-ratio-calculator

For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

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