Free Rowing Calculators and Tools

Q: Where do the formulas come from?

Pace and watts use the canonical Concept2 power formula: watts = 2.80 / (split_seconds / 500)^3. Calories use the Concept2 calorie formula: kcal/hr = (watts * 4) + 300. Distance predictions use the Riegel endurance model: T2 = T1 * (D2 / D1)^1.06, using Riegel's 1.06 endurance exponent. Age-graded scores follow the Concept2 logbook age coefficients. Every calculator references which formula it uses so you can sanity-check the maths.

Free, no signup

Rowing Tools

Every conversion you actually need at the erg or in the boathouse, in one place. Concept2-accurate maths, Riegel-tuned predictions, and the same calculations that run inside the Row HQ coach dashboard for whole-club tracking. Used by clubs prepping crews for Henley, BUCS and head-of-the-river fixtures.

13 free tools No sign-up needed

What does the Row HQ tools page do?

Every calculator on this page runs in the browser. No signup, no login. Convert a 500m split to watts, work out a weight-adjusted erg score, plan training paces by zone, or predict a 2k from a longer test. The maths uses the Concept2 power formula and the Riegel endurance model that coaches already know.

Pace, scores and predictions

Erg Pace Calculator

Convert 500m split to time, watts and calories. Predict pace at 2k, 5k, 6k, 10k, half marathon and marathon.

Open calculator

Benchmark

Erg Score Calculator

Weight-adjusted erg score plus age-graded percentile. See where your 2k, 5k or 6k stands across club, university and national fields.

Open calculator

Coach magnet

Training Pace Calculator

Enter your 2k split, get target paces and stroke rates for UT2, UT1, AT, TR and AN zones plus coach-ready interval prescriptions.

Plan a session

Visual

Rowing Pace Chart

Visual chart of your predicted times across every distance from 500m to marathon, with training-zone bands. Screenshot-friendly.

See chart

Race day

2k Prediction Calculator

Predict your 2k from a 5k, 6k, 10k or 30-minute test, with confidence bands and a target-pace plan to hit each estimate.

Predict 2k

Power, drag and bodyweight

Power tool

Watts to Split Converter

Convert any wattage to a 500m split, or split to watts. Bidirectional with reference table for coach-set wattage targets.

Open converter

Settings

Drag Factor Calculator

Recommended Concept2 drag factor by weight, experience and goal. Cuts through the "higher = harder" myth with evidence-based settings.

Find your drag

Lightweight

Bodyweight-Adjusted Erg Score

Compare lightweight and heavyweight 2k times on a fair scale using the Concept2 weight-adjustment formula.

Adjust your score

Training and health

Technique

Stroke Rate Calculator

Calculate distance per stroke from rate and split, or split from DPS and rate. With training-zone reference.

Calculate DPS

Nutrition

Concept2 Calorie Converter

Convert kJ from your PM5 monitor into total calories burned. Uses the official Concept2 formula. Works both ways for nutrition planning.

Convert kJ to calories

Performance

VO2 Max Calculator (Rowing)

Estimate VO2max from a 2k erg time, body weight and sex using the Klusiewicz 2016 regression. Includes trained-rower benchmark bands.

Estimate my VO2max

Cross-training

Rowing-to-Running Pace Converter

Translate your 500m rowing split into the equivalent running pace per km or mile. Two methods, both sourced, with honest accuracy caveats.

Convert rowing pace

Club safety

Safety

Rowing Risk Assessment Generator

Federation-aligned risk assessment for your club. BR RowSafe, USRowing or Rowing Australia + state. 5x5 matrix, auto-suggested controls, printable output.

Build a risk assessment

Why a rowing club built free calculators

The Concept2 ergometer is the standard piece of testing kit across rowing, but the conversions you actually want at the erg are scattered across forum posts, half-broken Excel sheets and ad-heavy widgets. Every coach we know has rebuilt the same pace-to-watts table. Every rower has searched "erg pace calculator" five minutes before a session. The maths is not the hard part - the hard part is having it in one place that loads fast and trusts you to read the numbers.

These tools all use the same Concept2 power formula, the same Riegel endurance model and the same training-zone definitions used at Oundle Town Rowing Club and the other clubs that run on Row HQ. They are free because the maths is not proprietary; it belongs to rowing. What we charge for is the part that scales: pulling a whole squad's history out of a database, building lineups from current data, watching trends across a season - the stuff a calculator on a static page cannot do.

If you spot a calculation we have not built yet, tell us via the contact form and we will probably ship it. The list at the top of this page started as a wishlist from coaches at three clubs.

One rower? Easy. Thirty? That's Row HQ.

A calculator turns one input into one output. Coaching a squad means turning thirty inputs into a season-long plan, watching every PB, building lineups from current data, and catching plateaus before they show up in race results. That's a database job, not a calculator job. Row HQ runs the same maths as the tools on this page, but does it for every athlete, every session, automatically.

Check Row HQ pricing, then see it in action across training session tracking, coach tools, the admin dashboard, and read about how Oundle Town RC migrated off spreadsheets. Or just compare against the spreadsheet workflow most clubs are still stuck on.

Book a Demo Set up your club free

Common questions

What is the best free rowing calculator?

The right rowing calculator depends on what you are working out. To convert a 500m split to time, watts or calories, use the erg pace calculator. To benchmark your score against your age and weight, use the erg score calculator. To plan training sessions, use the training pace calculator. The Row HQ tools all run on the official Concept2 power formula and the Riegel endurance model, so the numbers match what your erg displays. They are free, browser-based and need no signup. For daily session planning start with the pace calculator; in testing weeks, the score calculator.

Are these rowing tools really free?

Yes. Every calculator on this page is free with no signup, no email capture and no paywall. They run entirely in the browser, so your numbers never leave your device. We built these because we kept needing the same conversions on the way to training. The full Row HQ rowing club management platform is paid, but the tools here are public goods for the rowing community.

Where do the formulas come from?

Pace and watts use the canonical Concept2 power formula: watts = 2.80 / (split_seconds / 500)^3. Calories use the Concept2 calorie formula: kcal/hr = (watts * 4) + 300. Distance predictions use the Riegel endurance model: T2 = T1 * (D2 / D1)^1.06, using Riegel's 1.06 endurance exponent. Age-graded scores follow the Concept2 logbook age coefficients. Every calculator references which formula it uses so you can sanity-check the maths.

Do these tools work on mobile?

Yes. Every tool is mobile-first responsive, designed to work between sets at the erg or in the boathouse. Inputs are tap-friendly, results update live, and the visual pace chart is touch-optimised. The save-to-device feature uses your browser's local storage, so your last few splits are still there when you reopen the page on the same device. There is no native app to install.

Can I use these tools for my whole rowing club?

These calculators are designed for one rower at a time. If you need to run the same conversions across thirty athletes, log every session against each rower automatically, pull crew lineups from current ergo data and watch trends across a season, that is exactly what Row HQ is built for. The free tools here are the same maths that runs inside the club platform, just without the database underneath.

Free Rowing Tools