Fat Burning Heart Rate Calculator

Zone	Heart rate	What it trains
Zone 1 — Very light (50–60%)	122–134 bpm	Warm-up, recovery, active daily movement
Zone 2 — Light (60–70%)	134–146 bpm	Base endurance, fat oxidation, long easy sessions
Zone 3 — Moderate (70–80%)	146–159 bpm	Aerobic conditioning, tempo work
Zone 4 — Hard (80–90%)	159–171 bpm	Threshold intervals, speed endurance
Zone 5 — Maximum (90–100%)	171–184 bpm	VO2 max intervals, short maximal efforts

Zone	60 – 70% of max HR
At max 185	About 111 – 130 bpm
Trade-off	Higher fat % vs lower total
Inputs	Age, resting HR

What is Fat Burning Heart Rate Calculator?

At low-to-moderate intensity your body draws a higher proportion of its energy from fat; as intensity rises, carbohydrate takes over. The 'fat-burning zone' describes the lower-intensity range where that fat proportion peaks, generally around 60–70% of maximum heart rate. The catch is that proportion and total are different things: at easy pace you might burn 60% of your energy from fat, but at a much lower total, while a hard session burns a smaller percentage of a far larger number. For weight loss, what matters is the total calorie deficit across the day, not the fuel mix of any one session. The zone is still useful for building aerobic base and for training that you can sustain for a long time.

Common Uses for Fat Burning Heart Rate Calculator

Find the heart-rate range for steady fat-burning exercise
Understand the fat-proportion versus total-calories trade-off
Guide long, low-intensity cardio sessions
Set a target for active recovery work

Frequently Asked Questions

Does the fat-burning zone burn more fat?

It burns a higher proportion of calories from fat, but fewer total calories. For fat loss over a day, total energy balance matters more than the proportion in one session.

Should I only train in the fat-burning zone?

No. A mix of easy and hard sessions is best for fitness and for total calories burned. Easy work builds base and is sustainable; hard work improves capacity.

Why is my fat-burning zone so low?

Because it is a percentage of your maximum heart rate, so it sits below your comfortable running pace for many people. That is expected — it is meant to feel easy.