I have downloaded GnomAD vcf file and want to calculate the minor allele frequency of each variant in that file. But I am not quite sure how to do that. I have an INFO column which has AC,AF, AN in there. Does AF refers to minor allele frequency for that variant? If not then how can I calculate the minor allele frequency. I've given below three variants from the file just to show you what a gnomAD file looks like

 `chr1	905315	.	C	A	293.0	PASS	AC=1;AN=143276;AF=6.97954e-06;variant_type=snv...	chr1	905311	906011	chr1:905311-906011	63	.	905431	905432	0,0,0	2	70,528	0,172`

`chr1	905315	rs1489213119	C	T	1432.0	PASS	AC=1;AN=143276;AF=6.97954e-06;variant_type=snv...	chr1	905311	906011	chr1:905311-906011	63	.	905431	905432	0,0,0	2	70,528	0,172`


I am sorry if this is a basic question. I am new to bioinformatics and haven't been able to find a solution yet. 
Yes AF is the MAF here.

It bears mentioning that sometimes the variant might not necessarily be the less common allele in all populations, and the major allele might even confer something weakly deleterious. But in these two cases, they only saw one individual with this mutation.