You might need to check the tune of each string a few times. Test the tuning by playing a chord. Pluck each string in the chord and make sure each string sounds in tune.
Tune the 4th string to the 5th fret of the 5th string. Tune the 3rd string to the 5th fret of the 4th string. Tune the 2nd string to the 4th fret of the 3rd string. Tune the 1st string to the 5th fret of the 2nd string.
You’ll tune the guitar into standard tuning, which is a half step lower than the first fret. Then when you remove the capo, you’ll be tuned a half step lower.
This can be a good technique if your tuner is not chromatic. Chromatic tuners hit all the notes including sharps and flats.