In this paper, we assessed four methods (total alkalinity anomaly, calcium anomaly, ⁴⁵Ca incorporation, and ¹³C incorporation) to determine coral calcification of a reef-building coral. Under all conditions (light vs. dark incubations and ambient vs. lowered pH levels), calcification rates estimated using the alkalinity and calcium anomaly techniques as well as ⁴⁵Ca incorporation were highly correlated, while significantly different results were obtained with the ¹³C incorporation technique.