Which enzyme activity units does the converter support?

It supports U, mU, µU, kat, mkat, µkat, nkat, and pkat.

What does 1 U represent?

One U represents 1 µmol/min and equals approximately 16.667 nkat.

What does 1 katal represent?

One katal represents 1 mol/s and equals 6×10⁷ U.

Can I convert nkat to U?

Yes. For example, 450 nkat converts to 27 U.

What output does the tool provide?

The converter returns the equivalent activity values as a JSON result, with configurable decimal places.

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Enzyme Activity Unit Converter (U ↔ katal)

Converts activity values exactly between U/mU/µU and katal/mkat/µkat/nkat/pkat (1 U = 16.67 nkat, 1 kat = 6×10⁷ U). Educational use only.

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2 examples

120 U → 2 µkat = 2000 nkat

A reagent datasheet lists a stock at 120 U. Since 1 U = 16.667 nkat, the SI value is 120 × 16.667 nkat = 2000 nkat = 2 µkat — exactly what an IUPAC-following journal asks you to report instead of legacy Units.

{"result":"120 U = 2 µkat = 2,000 nkat = 2,000 µmol/min","metadata":{"input":{"value":120,"fromUnit":"U"},"result":{"microKatal":2,"nanoKatal":2000,"unitsU":120}}}

450 nkat → 27 U

A paper reports an activity of 450 nkat, but your lab notebook and protocols work in Units. Because 1 nkat = 0.06 U, the value is 450 × 0.06 = 27 U = 27 µmol/min, letting you compare it directly with your own measurements.

{"result":"450 nkat = 0.00045 µkat = 27 U = 27 µmol/min","metadata":{"input":{"value":450,"fromUnit":"nkat"},"result":{"unitsU":27,"nanoKatal":450,"microMolPerMin":27}}}

Inputs

Set the required fields, then run the tool.

3 options

SettingsAdjust formats, ranges, numbers, and modes.3

Activity ValuenumberRequiredActivity in the selected unit.From UnitselectRequiredUnit of the entered activity.Decimal PlacesnumberOptional

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Enzyme Activity Unit Converter (U ↔ katal)

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Examples

1. Convert 120 U to µkat and nkat

2. Convert 450 nkat to U

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