👉 Pee math, or estimating urine volume, is a practical skill that involves using simple arithmetic to approximate how much urine you've consumed. The basic formula is: Volume of urine = (Number of drinks × Fluid density) + Body weight × Gravity. For drinks, 8 ounces (240 ml) is a common standard, and fluid density is about 1 ounce per cup. Body weight in pounds and gravity (typically 32.2 feet per second squared) are used to convert pounds to ounces. This method is particularly useful for hydration tracking, especially in sports or clinical settings where precise measurements aren't always feasible. By multiplying your body weight by 4.18 (to convert pounds to ounces) and then adding the product of the number of drinks and 240 ml, you can quickly estimate your urine volume. This rough calculation helps ensure adequate hydration without the need for constant weighing or measuring.