Repurpose

Cat nail scissors work great to split calcium supplement tablets in half. Yes, I washed them first.

Split the Doses

Cap single doses at 500 mg or less: Your body cannot absorb more than 500 mg of elemental calcium at one time. Taking a large dose all at once causes unabsorbed minerals to sit in your gut, leading to gas, bloating, and constipation. [1, 2, 3]
Start low and build up: If you are new to supplements, start with a small dose (such as 200 mg to 300 mg daily) for a week and slowly increase. [1]