Sweat rates vary hugely between people — heat, humidity, intensity, and individual physiology all play a part. Knowing your own number turns "just drink some water" into an actual plan: how much to drink per hour, and how many DRVN servings that works out as.
How to do it: weigh yourself before and after a training session (avoid going to the bathroom between weigh ins), track anything you drank or ate, and enter the numbers below.
What to do with your result
0.5–1.5 L/hour is typical. A standard single serving of DRVN Threshold (1 scoop : 1 litre water) sipped through the session covers this comfortably.
1.5–2.5 L/hour is a high sweat rate. Aim to match it more closely, spreading a second serving across the session and consider front-loading by drinking 250-500 ml pre-session.
Over 2.5 L/hour is a very high sweat rate. Matching fluid loss litre-for-litre becomes impractical during exercise — the label guidance is a maximum of 2 servings per day, so lean on pre-session hydration and accept a degree of controlled dehydration during the session itself rather than trying to drink your way out of it.
Repeat the test two or three times, ideally in conditions similar to your usual training, for a more reliable number — sweat rate shifts with heat, humidity and effort.
Want the full picture on sweat sodium losses and how to tell if you're a salty sweater? Head to the Fight Week Rehydration Calculator page — it covers both in detail.
Ready to try DRVN in your next session? Shop now.