Calcium levels in various organismsbr br A person contains about 1 kg to 1.5 kg of calcium. br This is approximately 1.5 calcium.br Cattle - also 1.5 calcium, but some marine organisms may contain more calcium. br For example, corals that contain up to 20 calcium. br Other interesting organisms that contain a lot of calcium are echinoderms (similar to hedgehogs). br These organisms contain up to 45 calcium.