Hi Yaka,

Sure, I can help you with that! Here's how you can set up a formula to calculate your weight gain or loss in Excel:

1. First, you'll need to decide on a starting weight. Let's say your starting weight is 120 pounds.
2. In the cell next to your starting weight (let's say it's cell A2), enter the formula "=0". This will be your starting point for calculating weight gain or loss.
3. In the cell next to your first weight entry (let's say it's cell B2), enter the formula "=B2-A2". This will calculate the difference between your first weight and your starting weight.
4. Copy the formula in step 3 and paste it into the cell next to each subsequent weight entry. Excel will automatically adjust the formula to calculate the difference between each weight entry and the starting weight.
5. To make the formula cumulative, you'll need to use a running total formula. In the cell next to your first weight entry (let's say it's cell C2), enter the formula "=B2". This will show your weight for that entry.
6. In the cell next to your second weight entry (let's say it's cell C3), enter the formula "=C2+B3". This will add the weight difference from your second entry to your weight from your first entry, giving you a running total.
7. Copy the formula in step 6 and paste it into the cell next to each subsequent weight entry. Excel will automatically adjust the formula to calculate the running total for each entry.
8. To make the chart, select the cells with your weight entries and running total formula, then click on the "Insert" tab and select the chart type you want to use. You can customize the chart as needed.

That's it! Now you can enter your weight in each cell and Excel will calculate your weight gain or loss and show you a running total in chart form.