Watts to Split Time Converter
By the Watta Team · Updated
Enter a wattage and get the /500m split it corresponds to on a Concept2. 200W is a 2:00.5 split; 300W is 1:45.3.
Watts to Split
Rowing this later? Watta logs the real piece from a photo of your PM5 — free on iPhone.
The split behind every round wattage
Computed with the same functions as the calculator above, so the two cannot disagree.
| Watts | /500m split | 2K at that pace | 30 min at that pace |
|---|---|---|---|
| 100 W | 2:31.8 | 10:07 | 5,929 m |
| 150 W | 2:12.6 | 8:50 | 6,787 m |
| 200 W | 2:00.5 | 8:02 | 7,469 m |
| 250 W | 1:51.9 | 7:28 | 8,043 m |
| 300 W | 1:45.3 | 7:01 | 8,547 m |
| 350 W | 1:40.0 | 6:40 | 9,000 m |
| 400 W | 1:35.6 | 6:22 | 9,414 m |
Doubling the watts does not halve the split: 400W is only about 26% faster than 200W.
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About This Calculator
The watts to split time converter translates power output into the /500m pace you would see on a Concept2 monitor. It is the inverse of the Concept2 watts formula: split (seconds per 500m) = 500 × (2.80 / watts)^(1/3). Coaches often prescribe intervals in watts because power is a direct measure of work, whereas split is what the PM5 shows most prominently. Because of the cubic relationship, equal steps in watts produce shrinking steps in split: 150W to 200W is worth 12.1 seconds per 500m, but 300W to 350W only 5.3 seconds.
How This Works
Enter a wattage. The calculator divides 2.80 by the watts, takes the cube root to get seconds per metre, and multiplies by 500 for the /500m split. This is the exact inverse of the calculation the PM5 uses to display watts from pace.
Formula
Examples
A training programme prescribes intervals at 200 watts
You need to hold a 2:00.5/500m split.
Your coach sets a steady state target of 150 watts
You should hold a 2:12.6/500m split — a comfortable UT2 pace for many club rowers.
You want to know what 300 watts looks like on the monitor
300 watts equals a 1:45.3/500m split — a 2K of about 7:01 if held for the full distance.
Worked examples are generated from the same formulas as the calculator above.
Benchmarks
| Level | Value |
|---|---|
| Light recovery | 80–120W (2:43.6–2:22.9 split) |
| Steady state (UT2) | 140–180W (2:15.7–2:04.8 split) |
| Threshold | 220–280W (1:56.7–1:47.7 split) |
| Race pace (2K) | 280–400W (1:47.7–1:35.6 split) |
| Sprint | 400–700W+ (1:35.6–1:19.4 split) |
More reference tables — 2K, 5K and 500m standards, watts by level, stroke rates and a split-to-watts table — are on the Stats & Benchmarks page.
In the Watta App
Watta logs both the split and the watts for every piece you photograph, so a watts-based training plan and a split-based monitor stop being two sets of numbers to reconcile.