Skip to content

Cart

Your cart is empty

Sweat Test

Sweat & Sodium Loss Calculator for Runners & Triathletes

Use this quick calculator to find your true sweat rate, total fluid lost, and sodium loss. Just enter your weight before and after, workout time, and how salty a sweater you are.

We’ll show you:

Your sweat rate (L/hr)

How much fluid and sodium you lost

What to drink and eat to replace it

Sweat & Sodium Loss Calculator

Moderate 🥵 🥵
Low
600 mg/L
Mod
900
High
1200
Heavy
1600
How to tell:
  • Low: Hardly any salt on skin/clothes; little stinging in eyes.
  • Moderate 🥵: Noticeable salt on skin; white marks on hat/kit after long workout.
  • High: Sweat stings eyes, leaves thick salt marks, lips feel gritty.
  • Heavy 💦: Salt caked on face, arms, or helmet straps; cramps common, very thirsty.
If unsure, pick "Moderate" or ask a coach.
0 🥤
1 bottle = 20 oz (0.59L)

YOUR HYDRATION, MADE SIMPLE

HOW TO USE THE SWEAT & SODIUM LOSS CALCULATOR

Science-based

Backed by real research on sweat rates and sodium loss

Customizable

Dial in your numbers—works for all levels, any sport

Mobile friendly

Quick and easy to use anywhere, even on the go

Dial In Your Hydration

Not sure how much water or salt you lose when you train?

Plug in your numbers and get real answers—plus product and food tips to help you bounce back stronger.

Breno

Breno's Assistant

Online now