Is there anyway you can find out how big a kidney stone is without going to the doctor?

No: Unless you can get an abdominal x-ray (kub) or kidney ultrasound without seeing a doctor first.

See answer: The size of a kidney or ureteral stone can only be determined by an imaging study: ct scan, kub, and renal ultrasound are the most commonly used imaging studies. Ct: most accurate study for detecting the presence of a stone in kidney or ureter. If the stone is visualized on kub, this is the most accurate for correct size. Renal ultrasound: least commonly used and not best for ureteral stones.