Rowing Training Zone Calculator
Calculate all five rowing training zones from your 2K erg test time.
Get target 500m split times for UT2, UT1, AT, TR, and AN intensity workouts.
Rowing Training Zones
All structured rowing training is organized into five zones based on physiological intensity. Each zone targets a specific energy system and produces different fitness adaptations.
The five zones (as a share of your 2K power):
| Zone | Name | % of 2K power | Heart Rate | Purpose |
|---|---|---|---|---|
| UT2 | Aerobic base | 55-65% | 60-70% max HR | Recovery, base aerobic, long rows |
| UT1 | Upper aerobic | 65-75% | 70-80% max HR | Aerobic development, steady state |
| AT | Anaerobic threshold | 75-85% | 80-85% max HR | Race-pace endurance, threshold work |
| TR | Transport | 85-95% | 85-92% max HR | Speed endurance, shorter intervals |
| AN | Anaerobic | 95-105% | 92-100% max HR | Race pace and above, power development |
Why percentages and not a fixed number of seconds
Plenty of zone charts give you a flat offset instead: UT2 is your 2K split plus 20 seconds, and so on. That works for exactly one speed of rower and drifts badly either side of it, because the Concept2 relationship between pace and power is cubic, not linear. Sixty percent of your power always means the same physiological effort, but what it costs in seconds depends on how fast you already are.
Run the arithmetic and the gap is obvious. A 7:00 rower holds a 1:45 2K split, and 55-65% of that power lands them at 2:01 to 2:08, so UT2 sits 16 to 23 seconds off race pace. Give the same treatment to an 8:00 rower on a 2:00 split and UT2 becomes 2:19 to 2:26, which is 19 to 26 seconds off. The elite 6:00 rower gets 1:44 to 1:50, only 14 to 20 seconds. One fixed offset cannot serve all three, and the calculator above does the conversion for whichever one you are.
How to use zone training: A typical rowing training week distributes effort as:
- 70-80% UT2 (long, comfortable pieces)
- 10-15% UT1 (moderate steady-state)
- 5-10% AT (threshold intervals)
- 0-5% TR and AN (speed work, sharpening)
2K test protocols:
- Full warm-up: 15-20 minutes of UT2 rowing
- 5 minutes rest
- 2000m all-out effort — even splits or slightly negative (second 1K faster)
- Cool down and record split time
- Test every 6-8 weeks to update zones
Common 2K times and target paces:
| Level | 2K Time (M) | 2K Time (F) | 500m Split |
|---|---|---|---|
| Beginner | 8:00-9:00 | 9:00-10:00 | 2:00-2:15 / 2:15-2:30 |
| Intermediate | 7:00-8:00 | 8:00-9:00 | 1:45-2:00 / 2:00-2:15 |
| Advanced | 6:20-7:00 | 7:20-8:00 | 1:35-1:45 / 1:50-2:00 |
| Elite | Under 6:00 | Under 7:00 | Under 1:30 / Under 1:45 |
Stroke rate by zone:
- UT2: 18-22 spm (focus on ratio and technique)
- UT1: 22-24 spm
- AT: 24-28 spm (race-pace rhythm)
- TR/AN: 28-36+ spm (power and speed)
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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