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

Open calculator

Benchmark

Erg Score Calculator

Compare raw erg scores with Concept2 weight-adjusted times and an illustrative age adjustment. Includes example bands and clear limits.

Open calculator

Training

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

Compare predicted splits from 500m to half marathon and equal-pace reference times. Includes illustrative training-zone bands and printable tables.

See chart

Race day

2k Prediction Calculator

Estimate a 2k time from a longer test. Compare three model scenarios and a target split time, then check the estimate against real results.

Predict 2k

Power, drag and bodyweight

Power tool

Watts to Split Converter

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

Open converter

Settings

Drag Factor Calculator

Choose an illustrative starting drag factor, then check the monitor reading and stroke feel. Explains why the damper setting is not a fixed drag value.

Find your drag

Lightweight

Bodyweight-Adjusted Erg Score

Calculate a Concept2 weight-adjusted erg score from body weight and actual time. Keep the original result for online rankings.

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

Energy

Concept2 Calorie Converter

Convert mechanical work in kJ and session duration into estimated Concept2 monitor Calories. Includes the inverse calculation and worked examples.

Convert kJ to calories

Performance

VO2 Max Calculator (Rowing)

Estimate VO2 max from a maximal 2k test, body weight and training level using Concept2 equations. Includes worked examples and model limits.

Estimate my VO2max

Cross-training

Rowing-to-Running Pace Converter

Compare rowing and running pace using two illustrative models. Choose the intended effort and work duration before using a substitution.

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.

The conversion tools explain the Concept2 formulas they use. Predictions and training suggestions also state their assumptions. Keep calculated results beside real session data, as clubs such as Oundle Town Rowing Club do when reviewing progress. A calculator helps with one result; your club records provide the wider context.

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.

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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 time 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.

Related rowing terms

Which rowing calculator should you use first?

Choose the rowing calculator that matches your question. A pace calculator converts distance, total time and split time. A score calculator applies a comparison method to a recorded result. A pace predictor estimates a different test distance. Keeping those jobs separate makes the output easier to use in a training session.

Choose a tool from the input you already have. Split time means the time per 500 metres. The pace tool converts split time into finish time; the chart compares that split time across distances. The score tool compares raw and adjusted results. Use a completed test for training targets and keep estimated results labelled as estimates.

Free rowing tools by task
Your question	Start here	Have ready
What split time do I need?	Erg pace calculator	Distance and total time
What power does that split require?	Watts to split converter	Watts or average 500m split
How should I compare scores?	Erg score calculator	Raw time, distance and body weight
What pace should I train at?	Training pace calculator	A recent 2k test
What should the club check before rowing?	Rowing risk assessment	Venue, participants and local controls

These tools explain their formulas and assumptions on the individual pages. Calculated examples are not official rankings. For a competition comparison, use a current ranking filtered by distance, age group and category, and submit your raw score.

Start a pace calculation in the erg pace calculator then use the result to check your target finish time.

For endurance-based estimates, open the 2k prediction calculator and enter a completed test.

Before an on-water session, review the rowing risk assessment tool with the person responsible for club safety.

Method and further reading: Concept2 pace calculator and formulas

Free Rowing Tools