Adding up entries in a list to create a running total

Hi everyone.

Currently we have a list which includes the production figures for every hour. I have created a column at the end called running total in which I would like it to add up the previous entries and display the total figure so far.

I think I need to use the calculation field in SharePoint Designer 2013, but I am unsure how to do it.

So I want to get the data form a field called ‘Actual Number Made’ and display this number in the running total column but have the running total column add all previous entries together.

So it could look like

Actual Number Made – 3000                Running Total – 11,000

Actual Number Made – 4000               

Actual Number Made – 4000