# Caffeine Half-Life Calculator

> Caffeine half-life calculator: track how much caffeine remains in your body hour by hour so you can time your last coffee and protect your sleep. Free, no signup.

- **Canonical URL:** https://boringtoolskit.com/caffeine-half-life-calculator/
- **Category:** Health
- **Evidence level:** catalogue
- **Reviewed:** July 26, 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

---

*Local planning estimate. Verify current terms, rates, and policies before acting.*