Why Elite Rowers Use Watts (and Why You Should Too)

Introduction

Indoor rowing has long relied on the 500m split time as its default pacing metric. While useful for race preparation, this metric can be misleading when used as a standalone measure of training intensity or performance. Elite rowers and coaches have increasingly shifted toward watts as the preferred metric, because watts reflect actual power output.

This article outlines the differences between split and watts, and why understanding and training with power is relevant not only to rowers, but also to CrossFit athletes, Hyrox competitors, and anyone pursuing efficient, measurable fitness.

Why Split Time Falls Short

The 500m split shows how long it would take to row 500 metres at your current pace. It’s intuitive and well-suited to fixed-distance targets like the 2K. But it is based on a derived pace calculation, not a direct measure of effort.

More importantly, split time improves exponentially as pace increases. That means a 10-second drop in split at slower speeds may represent a modest increase in output, but the same drop at faster paces requires disproportionately more effort.

This exponential relationship makes it difficult to:

• Compare efforts across different fitness levels
• Measure small but meaningful gains in performance
• Design structured training zones based on output

What Watts Actually Measure

Watts quantify power: the amount of work performed per unit of time. On the rowing machine, it reflects the force you apply through the drive phase of each stroke, captured in a consistent formula regardless of body size or drag factor.

In training terms, watts are:

• Linear: A 10-watt gain always represents the same increase in output
• Universal: They can be used across sessions, machines, and athletes
• Actionable: They allow for precise training zones and progressive overload

This is why elite athletes (across rowing, cycling, and endurance sport) train with power. It enables them to control intensity, monitor trends, and make informed adjustments over time.

A Look at the Data

Show calories / hour

500 m split	Watts	Δ Watts	Cal / hr*
2:30	104	—	716
2:20	128	+24	812
2:10	159	+31	936
2:00	203	+44	1,112
1:50	263	+60	1,352
1:40	350	+87	1,700
1:30	480	+130	2,220

The chart above shows how watts change as split time shifts. As the split drops (you row faster), wattage climbs sharply: what looks like a small change in pace often demands a big jump in output. Consider:

• Moving from a 2:30 to 2:20 split takes a modest 24-watt increase
• Dropping from 2:00 to 1:50 takes 60 more watts
• From 1:40 to 1:30, the jump is over 130 watts

These are not just numbers. They represent significantly higher physiological demand. The curve illustrates what athletes experience: gains become harder to earn the faster you go.

Split time hides this reality. It gives the appearance of steady improvement, while actual effort scales exponentially. In contrast, watts provide a direct and honest account of how hard you’re working.

Calories/hour, shown as a secondary line in the chart, follow a similar shape because they are calculated from watts. But calories are an estimate based on assumptions (typically an 80kg user) and are less useful for real-time training feedback.

Application in CrossFit, Hyrox, and Fitness Training

Watts are particularly relevant for those using the erg outside traditional rowing environments.

In CrossFit or Hyrox events, where rowing is a single component of a broader test, athletes benefit from training with watts because it allows them to:

• Set repeatable, sustainable effort targets
• Regulate intensity across multiple rounds or mixed-modality workouts
• Track improvement across aerobic, threshold, or sprint efforts

Rather than relying on pacing alone, these users can anchor performance around objective power output, which is transferable across disciplines.

How to Switch to Watts

Using watts on the Concept2 is simple. Press the Units button on the PM5 monitor until the display switches to watts. From there, monitor your target ranges and track output over time.

Benefits include:

• Greater stability in feedback during intervals
• Easier comparison across sessions and machines
• Clearer indicators of fatigue, plateau, or progression

Why It Matters

Training with watts offers a more honest and consistent approach to performance. It removes the ambiguity of pacing metrics and replaces it with clear, comparable data. For elite rowers, it underpins every phase of a training cycle. For recreational users, it turns subjective effort into quantifiable improvement.

Whether you’re trying to shave seconds off a 2K, manage pacing during a Hyrox event, or simply train with purpose, watts offer the clarity to improve.

Summary

Split time shows how fast you’re going. Watts show how hard you’re working.

Elite rowers use watts because it reflects true performance. Fitness-focused users should do the same. If the goal is to train effectively and measure progress reliably, watts provide the most direct path forward.

Switch to watts. Train with purpose.