I would like to have a running total in Excel where I change weekly numbers in a column or two yet my last column keeps the year to date numbers. i.e. If A1 is 6 one week, B1 is 2 that week, C1 should be 8. The next week, A1 is 3, B1 is 4, C1 should be 15. Does anyone know a formula for this? Thanks.