How to Calculate Urine Output From Diaper Weight in Adults

February 27, 2023

By Steve Weber

Use the Product Dry-Weight chart below to quickly calculate a patient’s urine output. Weigh the wet disposable brief, underwear or pad on a standard scale, hanging spring scale or wheelchair/standing scale.

1. Determine product and size, find product dry-weight on chart
2. Zero scale to recalibrate and weigh wet product
3. Subtract dry weight from wet weight to calculate urine output

The weight in grams also equals the volume in milliliters (ml).

The Formula to Calculate Urine Output from a Diaper

The urine output formula is the wet weight of the diaper minus the dry weight of the diaper. The difference weight in grams is also the Volume ML/cc of urine output.

Adult Diaper Dry-Weight Chart

Item#	Product Description	Dry Weight in Grams
2311	Tranquility® SmartCore® Brief – Small	80
2312	Tranquility® SmartCore® Brief – Medium	99
2313	Tranquility® SmartCore® Brief – Large	120
2314	Tranquility® SmartCore® Brief – X-Large	134
2315	Tranquility® SmartCore® Brief – 2XL	150
2190	Tranquility® Bariatric Brief – 3XL	168
2192	Tranquility® HI-Rise™ Bariatric Brief – 3XL	180
2195	Tranquility® AIR-Plus™ Bariatric Brief – 4XL	165
2113	Tranquility® Premium OverNight™ Underwear – X-Small	59
2114	Tranquility® Premium OverNight™ Underwear – Small	62
2115	Tranquility® Premium OverNight™ Underwear – Medium	87
2116	Tranquility® Premium OverNight™ Underwear – Large	87
2117	Tranquility® Premium OverNight™ Underwear – X-Large	96
2118	Tranquility® Premium OverNight™ Underwear – 2XL	98
2604	Tranquility® Essential Underwear – Heavy Small/Youth X-Large	51
2605	Tranquility® Essential Underwear – Heavy Medium	70
2606	Tranquility® Essential Underwear – Heavy Large	70
2607	Tranquility® Essential Underwear – Heavy X-Large	76
2608	Tranquility® Essential Underwear – Heavy 2XL/Bariatric	78
3096	Tranquility 40 ® TopLiner® Booster Contour Pad	40
3097	Tranquility® TopLiner® Booster Contour Pad – Super-Plus	86
2709	Tranquility® AIR-Plus™ Underpad 23 x 36	82
2710	Tranquility® AIR-Plus™ Underpad 30 x 36	120