Forum Discussion
YTD Dynamic Calculation
1) Make sure that the cell with the formula is not formatted as text.
2) If you use comma as decimal separator, use semicolon in the formula:
=SUM(INDEX(B2:M2;MATCH(1;MONTH(B1:M1);0)):M2)
3) Try confirming the formula with Ctrl+Shift+Enter.
The dynamic approach is useful because it avoids having to manually change the range when the position of January changes. Using functions such as INDEX/MATCH or XMATCH makes the calculation much more flexible, especially when working with longer datasets.
I also find this same principle useful in engineering calculations: keeping the input range and calculation logic flexible makes tools easier to reuse for different projects. For example, I use a similar input-driven approach for pavement material estimation with CalcPave, where users can enter road dimensions, thickness, density, and binder content to calculate the required bitumen quantity.
You can see the calculator here: https://calcpave.com/
For Excel users, the key takeaway from this discussion is that the formula should identify the January starting point dynamically rather than relying on a fixed column.