---
title: "What Is Sweat Rate? Heat Stress and Hydration Glossary"
description: "Sweat rate is how much sweat a person loses over time. It changes with heat, humidity, effort, clothing and fitness, so it differs from worker to worker."
url: https://jmarsolutions.multisites.ai/glossary/sweat-rate
publisher: JMAR Solutions
phone: +1-214-632-7780
quote: https://jmarsolutions.multisites.ai/contact
---

Hydration science

# Sweat rate

Sweat rate is how much sweat a person loses over time. It changes with heat, humidity, effort, clothing and fitness, so it differs from worker to worker.

Sweat rate is the amount of sweat a person loses in a set time. It is not the same for everyone. Heat, humidity, effort and clothing all change it.

Why it matters: sweat takes water and [sodium](https://jmarsolutions.multisites.ai/glossary/sodium) out of the body. NIOSH notes that heat cramps usually affect workers who sweat a lot during strenuous activity. When sweating lasts for hours, NIOSH advises balanced [electrolytes](https://jmarsolutions.multisites.ai/glossary/electrolyte). See the [heat acclimatization schedule](https://jmarsolutions.multisites.ai/guides/heat-acclimatization-schedule) for new crews, the [jobsite hydration plan](https://jmarsolutions.multisites.ai/guides/jobsite-hydration-plan) and the [acclimatization](https://jmarsolutions.multisites.ai/glossary/acclimatization) entry.

[From JMAR SolutionsHydration programs and toolbox talks for crews](https://jmarsolutions.multisites.ai/hydration-programs)

## Related terms

-   [Hydration](https://jmarsolutions.multisites.ai/glossary/hydration)
-   [Electrolyte](https://jmarsolutions.multisites.ai/glossary/electrolyte)
-   [Sodium](https://jmarsolutions.multisites.ai/glossary/sodium)
-   [Acclimatization](https://jmarsolutions.multisites.ai/glossary/acclimatization)
-   [Heat cramps](https://jmarsolutions.multisites.ai/glossary/heat-cramps)

## Sources

1.  [CDC NIOSH: Heat-related Illnesses](https://www.cdc.gov/niosh/heat-stress/about/illnesses.html)
2.  [CDC NIOSH: Heat Stress Workplace Recommendations](https://www.cdc.gov/niosh/heat-stress/recommendations/index.html)

![Ironworkers silhouetted on a steel frame against a hot orange sunset](https://jmarsolutions.multisites.ai/_astro/sunset-steel.IhAMDca0_6wk53.webp)

## See it on your crew in 15 minutes

Jennifer walks your safety team through the drops, the protocol and the numbers on a short live call.

[Book a 15-minute demo](https://calendly.com/jen-jmarsolutions/15-min-meeting)