Network monitor in pan firewall

Can I use this chart to calculate as a current bandwidth utilization in the office?    I want to look at what bandwidth utilization I have now and estimate it's max growth based on new headcount / office expansion.

This is from the palo alto firewall in network monitor option.  The only thing its in bytes.  So if shows 1,200,000M bytes.  Not sure how to translate into Gigabit.
 Network monitor in Palo fw
Please advice.
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Just going to assume this traffic per day, so you have feb 26, 1.4 TB data moving thru in a day.  divide that by 24 hours and you get your number in GB per hour

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