If you allow too much tax to be withheld, you get a refund. You can determine how much is tax is taken out of your pay by the number of allowances you claim on your W-4. The W-4 has a worksheet to help you figure out how many personal allowances to take.
Step 5: Predict your next period. Now that we know how long your period cycle is, we can just use it to count the days to predict your next period. My period cycle is 28 days so if I count 28 days from February 10, that's when my next period should come.
As a general rule, you can predict your ovulation date by subtracting the length of your luteal phase from the total length of your average menstrual cycle. Example: If your cycle is 28 days long and your luteal phase last 14 days, then ovulation may occur on the 14th day of your cycle (28 days -14 days = cycle day 14).Needless to say, calculating ovulation by this method may not work for everyone.s a general rule, you can predict your ovulation date by subtracting the length of your luteal phase from the total length of your average menstrual cycle. Example: If your cycle is 28 days long and your luteal phase last 14 days, then ovulation may occur on the 14th day of your cycle (28 days -14 days = cycle day 14).