Colony-Forming Units Calculator

Estimate colony-forming units per milliliter from plate count, dilution, and plated volume.

Colonies counted

Dilution factor (example 1000 for 10⁻³)

Volume plated (mL)

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Scientific notation—

Estimated cells in undiluted plated volume—

How this calculator works

Estimate colony-forming units per milliliter from plate count, dilution, and plated volume.

Use consistent units and carefully reviewed inputs. Results are estimates for education, laboratory planning, and general informational use.