Multiply the amounts withheld on your pay stub by the number of your pay periods to get a good idea of what will be withheld for the year. If the totals match your tax liability for the previous year you should be fine.
It is a good idea to double-check paystubs throughout the year for proper withholding as our income can change. While adding up the federal or state withholding and comparing to last year's tax return is a good practice, if you have any life changes these can directly impact income tax liability and mean that the W4 needs to be updated. Some things that can qualify a new W4 that are often missed is:
If any of the above change, I recommend starting the W-4 calculator and then monitoring the paystubs for the change. The important take away is that the W-4 is not a static document and needs to be revisited at least twice a year, in my opinion.