Catalytic Activity Unit Converter
Convert the same catalytic activity between katal and explicitly defined enzyme units.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Normalize substance conversion rate to mol/s, the katal, retaining the same assay definition.
1 kat=1 mol/s; 1 enzyme U=1 µmol/min=(10⁻⁶/60) kat
Worked example
1 enzyme unit is approximately 16.6666667 nkat. One µkat equals 60 enzyme units.
Assumptions and input details
U here explicitly means the enzyme unit defined as 1 µmol substrate converted per minute under the specified assay conditions. It is not a universal drug, vitamin or biological-potency IU. The same assay method and conditions must be retained; the converter does not compare different enzymes, infer activity concentration or provide a dose.
References: IUPAC: enzyme activity unit definition · BIPM: SI derived quantities and units
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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