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---
name: BCL Convert
url: https://support.illumina.com/sequencing/sequencing_software/bcl-convert.html
description: >
bclconvert can be used to both demultiplex data and convert BCL files to
FASTQ file formats for downstream analysis.
---
This BclConvert module is based on the bcl2fastq multiqc module. It can parse multiple
bclconvert run outputs as long as they are from the same sequencing run. When doing this,
the undetermined reads will be 'corrected' and re-calculated (as an unknown read from
some one bclcovnert run might not be truly unknown, but simply from another run).
#### Calculate estimated depth
You can specify a genome size in config
It's often useful to talk about sequencing yield in terms of estimated depth of coverage.
In order to make MultiQC show the estimated depth for each sample, specify the reference genome/target size in your [MultiQC configuration](http://multiqc.info/docs/#configuring-multiqc):
```yaml
bclconvert:
genome_size: 3049315783
```
The coverage depth will be estimated as the yield Q30 dvivided by the genome size.
MultiQC comes with effective genome size presets for Human and Mouse, so you can
provide the genome build name instead, like this: `genome_size: hg38_genome`. The
following values are supported: `hg19_genome`, `hg38_genome`, `mm10_genome`.
#### Add barplots containing undetermined barcodes
By default, the bar plot of undetermined barcodes is only shown when reporting from a single demultiplexing run.
If you would like to show it with multiple runs (eg. bclconvert runs are split by lane),
you can specify following parameter in your MultiQC config:
```yaml
bclconvert:
create_undetermined_barcode_barplots: True
```
The default of this configuration value is `False`
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