# 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. > Canonical page: https://elysiatools.com/en/tools/enzyme-unit-converter - **Category:** Education - **Keywords:** enzyme unit converter, u to katal conversion, katal to unit calculator, enzyme activity unit conversion, nkat to u, microkatal enzyme, si unit enzyme activity, umol min to mol s, biochemistry calculator, lab calculator ## Overview The Enzyme Activity Unit Converter converts activity values between U, mU, µU, kat, mkat, µkat, nkat, and pkat. Enter a value, choose its source unit, and select the decimal precision for the JSON result. Educational use only. ## Inputs - **Activity Value** (number): Activity in the selected unit. - **From Unit** (select): Unit of the entered activity. - **Decimal Places** (number) ## When to use - Convert legacy enzyme Units (U) to SI-based katal units such as nkat or µkat. - Convert reported nkat or katal values into U for comparison with laboratory protocols. - Prepare consistent enzyme activity values for manuscripts, reagent specifications, or lab calculations. ## How it works - Enter the enzyme activity value in the Activity Value field. - Select the unit of the entered value from the From Unit list. - Choose the number of decimal places from 0 to 10, or keep the default of 6. - Receive the equivalent activity values in JSON format, including related U and katal units. ## Use cases - Translate enzyme activity values from reagent datasheets into the units used by a laboratory protocol. - Convert published nkat or katal measurements into U for direct comparison with existing results. - Standardize activity units in educational biochemistry exercises and experimental planning. ## Frequently asked questions ### 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. ## Related tools - [OD600 Cell Density Calculator (E. coli)](https://elysiatools.com/en/tools/od600-cell-density): OD600 turbidity to cells/mL (1×10⁹ per OD default) and cell dry weight g/L (0.36 per OD, BioNumbers 109837), normalized for dilution factor and path length, with total cells/CDW from the culture volume, per-cell pg CDW, and an OD > 1 linearity flag. Editable strain-specific factors. Agilent/VectorBuilder/BioNumbers derived. Educational use only. - [Protein–DNA Binding Affinity Calculator (Kd Estimate)](https://elysiatools.com/en/tools/protein-dna-binding-affinity): Single-point 1:1 Kd estimate: Kd = \[P\] × (1−f)/f from a direct fraction or anisotropy-derived fraction, plus ΔG° = RT·ln(Kd) and affinity bands from very tight (<1 nM) to weak (>1 µM). Cantor & Schimmel / Heyduk & Lee / Lakowicz derived. Educational use only. - [Protein Isoelectric Point Calculator (pI by Composition)](https://elysiatools.com/en/tools/protein-isoelectric-point): Theoretical pI via the simplified ExPASy/Bjellqvist pKa set with bisection to zero net charge, plus net charge at pH 7.4, ProtParam average molecular weight, and charged composition. Bjellqvist 1993 / Gasteiger 2003 derived. Educational use only. - [PCR Annealing Temperature Calculator (Ta = Tm − 5°C)](https://elysiatools.com/en/tools/annealing-temperature-calculator): PCR Ta by the simple rule (lower primer Tm − 5°C) or the Rychlik 1990 formula (0.3·Tm_primer + 0.7·Tm_product − 14.9), with a ±3°C gradient window and primer-Tm mismatch warning. Derived from Rychlik 1990, Innis & Gelfand 1990, Lorenz 2012. Lab-planning use only. - [Autosomal Dominant Pedigree Analyzer](https://elysiatools.com/en/tools/autosomal-dominant-pedigree): Compute AD offspring risk (Aa×aa 1:1, Aa×Aa 3:1, AA×any all affected), chi-square fit of observed children, and hallmark checks including male-to-male transmission that rules out X-linked dominant. Derived from Griffiths, Hartl & Clark 2007, StatPearls, OMIM. Educational use only. - [Autosomal Recessive Inheritance Risk Calculator](https://elysiatools.com/en/tools/autosomal-recessive-risk): Compute per-child and cumulative autosomal recessive disease risk from parental statuses (carrier / affected / non-carrier / unknown via population carrier rate), including the 2/3 carrier rule. Derived from Griffiths, Hartl & Clark 2007, StatPearls. Educational use only. - [Hemocytometer Cell Counter (cells/mL)](https://elysiatools.com/en/tools/cell-counting-hemocytometer): Turns Neubauer grid counts into cells/mL with dilution factor, total-count option, and 20–100 cells/square density advice. Educational use only. - [Cell Doubling Time Calculator (t_d = ln2·t/ln(Nₜ/N₀))](https://elysiatools.com/en/tools/cell-doubling-time): Doubling time, doublings, and specific growth rate from two exponential-phase cell counts, in h/min/day. Educational use only. ## Samples - [Web Image Processing Python Samples](https://elysiatools.com/en/samples/web-image-processing-python): Web Python image processing examples using PIL/Pillow including reading, saving, resizing, and format conversion - [Length Unit Samples](https://elysiatools.com/en/samples/length-unit): Practical length unit references you can copy when you want to compare common units directly with meters (m) - [Android Image Processing Java Samples](https://elysiatools.com/en/samples/android-image-processing-java): Android Java image processing examples including reading/saving images, scaling, and format conversion - [Android Image Processing Kotlin Samples](https://elysiatools.com/en/samples/android-image-processing-kotlin): Android Kotlin image processing examples including reading/saving images, scaling, and format conversion ## Related content - [Protein Quantification, Enzyme Kinetics, and Sequence Analysis Tools](https://elysiatools.com/en/hubs/protein-quantification-enzyme-kinetics-sequence-tools): Plan protein assays, convert concentrations, analyze sequences, and interpret enzyme activity, kinetics, inhibition, and binding measurements in one lab workflow. - [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows. - [Image Format Conversion and Animated Export Tools](https://elysiatools.com/en/hubs/image-convert): Compare image format converters for JPG, PNG, GIF, AVIF, WebP, TIFF, ICO, base64, and animation-friendly exports in one hub. - [JSON Interchange and Format Translation Tools](https://elysiatools.com/en/hubs/json-convert): Compare JSON conversion tools for CSV, YAML, TOML, GraphQL, XML, Markdown, Excel, BSON, EDN, and related structured formats in one hub.