pH of Urine

How acidic or alkaline your urine is.

Urine pH measures how acidic or alkaline your urine is — a number your kidneys adjust constantly as they balance what you eat, drink, and metabolize. It’s one of the quieter markers on a test strip, but it adds useful context, especially for kidney stones and urinary tract health.

What urine pH is

Urine pH typically ranges from about 4.5 to 8. Your kidneys use it as a release valve for the body’s acid-base balance: a protein-heavy diet pushes urine more acidic, while a plant-forward diet pushes it more alkaline. Neither end is inherently good or bad — it’s context that matters.

Why it matters

pH influences which substances stay dissolved in urine. Uric acid stones tend to form in acidic urine; calcium phosphate and struvite stones in alkaline urine. Some bacteria also raise urine pH, which is why an unusually alkaline reading alongside UTI symptoms is a meaningful detail.

What a result can tell you

If you’ve dealt with kidney stones, tracking pH shows whether diet changes are moving your urine chemistry in the direction your provider recommended. Day to day, it’s a window into how your food choices land — often within hours.

What it can’t tell you

pH swings naturally through the day — morning urine runs more acidic, and readings shift after meals. A single number diagnoses nothing. Trends over time, ideally measured at consistent times of day, are what carry meaning worth acting on.