Estimating Network Traffic Load

Hello!

I am looking for some advice on estimating network traffic load. My organization currently has a 100Mbps Internet connection and will be upgrading to 1Gbps in a couple of months. We have a content filter in place that is capable of handling 150Mbps of traffic. On any given day the traffic load on the filter fluctuates between 50-100Mbps.

With the upcoming increase in bandwidth, I need to determine whether we need to upgrade our content filter hardware to handle the potential increase in traffic load. Is there a good way to get a rough estimate based on the number of users?

Thanks!