Your 500 metre split and your power in watts are two ways of saying the same thing. The conversion isn't an approximation: it's the formula the Concept2 machines use themselves, and it holds for the SkiErg exactly as it does for the rower.
The calculator converts both ways and projects your times over 500, 1000, 2000 and 5000 metres at the split you give it.
Power—
Projected times at that split
| Distance | Projected time |
|---|
Converted with the Concept2 formula: power equals 2.80 divided by the cube of the time per metre. It is the one the machines themselves use.
The formula, and why it's cubic
Power equals 2.80 divided by the cube of the time taken to cover one metre. Put another way: to go twice as fast, you need eight times the power.
That cubic relationship is the most useful thing to understand about an ergometer, because it explains everything else. Going from 2:00 to 1:50 per 500 metres, ten seconds that look modest, takes roughly thirty percent more power. Finding another ten seconds would take considerably more again.
It's also why progress seems to slow when it hasn't. A beginner who takes twenty seconds off their 500 split in a month has gained less power than an experienced rower who takes off three.
What the cubic law changes about pacing
The practical consequence is brutal and rarely stated: on an ergometer, going out too fast costs more than it does in running.
Two seconds per 500 metres above your sustainable split represents about five percent too much power. Over a 2000, that debt gets repaid in the final five hundred metres, at the moment when the cubic law works against you: holding a collapsing split then demands a disproportionate amount of power.
Hence the rule every rower who holds their times follows: the first five hundred metres go one second above target split, not below. A well-paced 2000 finishes faster than it started, exactly like a running race.
The rower and SkiErg in hybrid racing
Two of the eight stations in a hybrid race are a 1000 metre SkiErg and a 1000 metre row, which puts this calculator at the centre of the subject for anyone preparing one.
What differs from a normal erg session is the context: those 1000 metres get rowed after a kilometre of running, with heart rate already up and legs loaded. Your fresh 1000 metre split isn't the one you'll hold in a race, and allowing five to ten seconds per 500 metres more is a realistic order of magnitude.
The classic trap is the SkiErg, which arrives as the first station while everything still feels fine. The rhythm feels easy, the cubic law does the rest, and the debt gets paid three stations later. Rowing the opening station at planned split instead of on feel is the single piece of advice that saves the most time in a first hybrid race.
The damper setting, and what it doesn't do
The lever on the side of the flywheel isn't a difficulty setting. It opens or closes the air intake, which changes how resistance distributes through the stroke, not the amount of work needed to hold a split.
A 2:00 per 500 demands the same power at damper 3 as at damper 10. What changes is the sensation: low, the stroke is light and quick, like a small gear on a bike; high, it's heavy and slow. Most rowers work between 3 and 5, and raising the damper to "work harder" is an illusion that mostly costs you a back.
The real measure of resistance is the drag factor, shown in the machine's menus, which accounts for wear and a dirty flywheel. Two machines set to the same damper can have different drag factors, and it's the drag factor to note down if you want to compare two sessions.
Split reference points
| Profile | 500 m | 2000 m |
|---|---|---|
| Getting started | 2:20 to 2:40 | 2:25 to 2:45 per 500 |
| Regular practice | 2:00 to 2:15 | 2:05 to 2:20 |
| Strong amateur | 1:45 to 1:55 | 1:50 to 2:00 |
| Competitor | 1:30 to 1:40 | 1:35 to 1:45 |
These bands describe an adult man and shift noticeably with size, more than they do in running: on an ergometer, mass is an advantage because it doesn't have to be carried.
What the monitor doesn't tell you
Stroke rate isn't power, and that's the most widespread confusion. The same 2:00 per 500 can be rowed at 22 strokes a minute with a powerful stroke or at 30 with a light one. The first version costs less energy and holds longer. Watching the rate climb while believing you're working harder is a classic error.
Machines aren't perfectly identical. The flywheel gets dirty, the chain wears, and two ergometers in the same gym can read one or two percent apart. Comparing a time from one gym with a time from another calls for the same caution as comparing two competition floors.
FAQ
Is the split-to-watts conversion exact?
Yes, it's the relationship the machine uses to display both values. It isn't an estimate: watts and 500 metre split are two ways of writing the same number.
Why is taking ten seconds off a 500 split so hard?
Because of the cubic relationship. Going from 2:00 to 1:50 takes about thirty percent more power, and the next ten seconds take more again. It's the same reason a cyclist gains little speed from gaining a lot of watts.
Should I raise the damper to improve?
No. The damper changes how the stroke feels, not the power needed to hold a split. Working between 3 and 5 suits the large majority of people, and a high damper tires your back before it improves anything.
What stroke rate should I aim for?
Between 20 and 24 strokes a minute on long efforts, 26 to 30 on short ones. Rate isn't the objective: power per stroke makes the split, and a high rate with a soft stroke produces a worse number while tiring you more.
Does the SkiErg follow the same formula?
Yes, the relationship between split and watts is identical. Absolute splits are usually a little slower than on the rower for the same effort, because less muscle mass is involved.
How do I pace the 1000 metres in a hybrid race?
At planned split rather than on feel, especially on the SkiErg that arrives first. Allow five to ten seconds per 500 metres above your fresh split, and accept that it feels slow: the next station and the run after it will remember how this one was handled.
Can I compare times from two different machines?
With caution. Flywheel wear and drag factor introduce one or two percent of difference. For personal tracking, note the drag factor and stay on the same machine when you can.
Is being heavier an advantage on an ergometer?
Yes, unlike in running, because the mass doesn't have to be moved. That's why competitive rowing separates weight categories, and why comparing your split with someone twenty kilos heavier doesn't mean much.
A split isn't a build-up
The calculator converts and projects. It doesn't tell you how many erg sessions belong in a week, or how to place them alongside running and strength, and that question is what decides progress. The Vitality Archetype test measures your profile across 5 dimensions in 27 questions and 3 minutes, then generates a week where each family is dosed for your recovery, adjusted with the feedback from each session.