Heart Rate Zones

100% Free

Calculate training heart rate zones from age and resting heart rate.

100% Secure

No Sign Up

Client-Side

Coming Soon

We're building Heart Rate Zones right now. Drop your email and we'll notify you the moment it's live.

Calculate training heart rate zones from age and resting heart rate.

This tool is on the roadmap. The interface and full documentation are being built — check back soon, or request priority to bump it up the queue.

Calculate UK alcohol units across multiple drinks, see grams of ethanol, and compare against the 14-units-per-week low-risk guideline.

Estimate Blood Alcohol Concentration from drinks, weight, gender, and time.

Calculate calories burned for any activity — running, cycling, yoga, gym.

Estimate your fitness age from VO2 max relative to your chronological age.

Calculate daily protein, carbs, and fat targets from goals and activity level.

Browse more free tools — no sign-up required