Training Zone Calculator

Enter a recent race result to get your personalized training pace zones for Zone 1 through Zone 5.

Training Zone Calculator

Enter a recent race result to get your personalized training pace zones.

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Understanding Running Training Zones

Training zones help you structure your runs by intensity. The 80/20 rule says you should do 80% of your running at low intensity (Zone 1-2) and 20% at high intensity (Zone 3-5). This maximizes results while minimizing injury risk.

Zone 1 — Recovery

Very easy running. Used for warm-ups, cool-downs, and recovery days. You should be able to hold a full conversation. This zone promotes blood flow and aids recovery without adding stress.

Zone 2 — Aerobic Base

This is where most of your training should happen. Comfortable pace with steady breathing. Builds aerobic endurance and mitochondrial density. Long runs should be at this pace. You should be able to speak in full sentences.

Zone 3 — Tempo

Comfortably hard. You can speak 3-4 words at a time. This pace improves lactate clearance and stamina. Tempo runs at this zone help you maintain faster paces for longer.

Zone 4 — Threshold

Hard, focused effort. Just below your lactate threshold. Improves your ability to sustain fast running for longer periods. You can only speak 1-2 words at a time.

Zone 5 — VO2 Max

Very hard, all-out effort. Used for short intervals to improve your maximum oxygen uptake and speed. You cannot speak during this effort. Should be limited to 3-5% of total training.

Training Zones Reference Table

Zone	Name	% of Race Pace	Feel	% of Training
Z1	Recovery	75%	Very easy, full conversation	60%
Z2	Aerobic Base	85%	Comfortable, steady breathing	20%
Z3	Tempo	93%	Comfortably hard, 3-4 words	10%
Z4	Threshold	98%	Hard, focused	7%
Z5	VO2 Max	105%	Very hard, all-out	3%

How to Structure Your Training Week

Here is a sample training week following the 80/20 rule for a runner training for a half marathon:

Monday: Rest or cross-training
Tuesday: Interval workout (Zone 4-5) — 6 x 800m at 5K pace
Wednesday: Easy run (Zone 2) — 4-5 miles
Thursday: Tempo run (Zone 3) — 4 miles at tempo pace
Friday: Rest or easy jog (Zone 1)
Saturday: Long run (Zone 2) — 10-12 miles
Sunday: Recovery run (Zone 1) — 3 miles

This structure gives you approximately 80% easy running (Mon, Wed, Fri, Sat, Sun) and 20% hard running (Tue, Thu).

Frequently Asked Questions

What percentage of running should be in Zone 2?

According to the 80/20 rule, approximately 80% of your running should be in Zone 1-2 (easy pace), with only 20% in Zone 3-5 (moderate to hard). This builds aerobic base while preventing overtraining.

What heart rate is Zone 2 running?

Zone 2 heart rate is typically 60-70% of your maximum heart rate. For a 40-year-old (max HR ~180), Zone 2 would be 108-126 bpm. This is the pace where you can hold a conversation comfortably.

How do I find my maximum heart rate?

The simplest method is the formula: 220 - age. However, this is only an estimate. For accuracy, perform a max heart rate test: warm up well, then run progressively faster for 20-30 minutes until you cannot continue.

Should I train by heart rate or pace?

Both have benefits. Heart rate accounts for daily variations in fitness, fatigue, and weather. Pace is more consistent and objective. Most coaches recommend using pace for structured workouts and heart rate for easy runs.

What is the 80/20 rule in running?

The 80/20 rule states that 80% of training should be at low intensity (Zone 1-2) and 20% at moderate to high intensity (Zone 3-5). Research shows this distribution optimizes performance while reducing injury risk.

Training Zone Calculator