Erg (Ergometer)

By the Watta Team · Updated

Erg (Ergometer): An erg (short for ergometer) is a rowing machine that measures work output, with the Concept2 being the standard used worldwide for training and testing.

What is Erg (Ergometer)?

Ergometer literally means "work meter" — a device that measures physical work. In rowing, "erg" universally refers to an indoor rowing machine, most commonly the Concept2 RowErg (formerly Model D and Model E). The erg uses an air resistance flywheel and chain mechanism to simulate the feel of rowing on water. Unlike weight machines or treadmills, the erg provides a variable resistance that responds to the force you apply — row harder and the resistance increases naturally. The erg is the primary testing and training tool in rowing, used for everything from 2K tests to marathon rows. It provides objective, comparable data that allows rowers worldwide to benchmark their fitness.

How Watta Uses Erg (Ergometer)

Watta is designed specifically for erg users. The app captures workout data from erg screen photos using AI-powered OCR, then calculates an Effort Score based on the mechanical output recorded by the ergometer plus your physiological data (heart rate, weight, age).

Further Reading

Frequently Asked Questions

What is the best erg for home use?
The Concept2 RowErg is the gold standard and costs approximately $990. It is the same machine used in every rowing club, CrossFit box, and Olympic training centre worldwide. It folds for storage and requires minimal maintenance.
Is erg rowing the same as rowing on water?
The physical motion is similar but not identical. On the erg, the handle moves; on water, the boat moves under you. The erg provides objective data and consistent conditions, making it ideal for fitness testing. The feel and technical nuances differ slightly.
What does ergometer mean?
Ergometer comes from the Greek "ergon" (work) and "metron" (measure). It is any device that measures work output during exercise. In rowing context, it refers exclusively to indoor rowing machines.

Related Content

Concept2 RowErgThe Concept2 RowErg is the industry-standard air-resistance indoor rowing machine used by Olympic teams, universities, CrossFit boxes, and home gyms worldwide.Concept2 Model DThe Concept2 Model D is the previous-generation name for the Concept2 RowErg, the world's most popular indoor rowing machine, now sold under the RowErg brand.PM5 MonitorThe PM5 (Performance Monitor 5) is the current-generation display unit on Concept2 ergometers, showing split time, distance, stroke rate, watts, heart rate, and other workout metrics.2K TestA 2K test is a 2,000-metre maximal effort rowing ergometer test — the standard benchmark for indoor rowing performance, used for team selection and fitness assessment.FlywheelThe flywheel is the spinning air resistance mechanism inside a Concept2 ergometer that generates resistance during the drive phase of the rowing stroke.Concept2 Model EThe Concept2 Model E is a taller version of the RowErg with a 20-inch seat height (vs 14 inches on the Model D), designed for easier access and commercial gym environments.Split to Watts ConverterRowing for BeginnersFor BeginnersFor Home Gym
Free on iPhone

Every erg counts.

Photograph your erg screen after the piece and Watta logs it for you.

Download on the App Store

iPhone, iOS 15.1 or later · no subscription · Android beta

See everything Watta does