Concept2 Erg Tool for Aotearoa Crews
Every Concept2 erg in a New Zealand boatshed reads in 500m splits, the time the PM5 monitor projects across the next half-kilometre at the current rate of work. Drop that number into the box below and the tool returns watt output, the per-hour calorie estimate that matches the screen, and projected splits across every test piece a Kiwi squad runs: the Olympic 2k, the 5k and 6k aerobic anchors, the long pieces that build toward Maadi, and the marathon piece a coach has chalked on the boatshed door at Karapiro.
A focused Concept2 converter for Aotearoa erg testing
A one-page tool that takes the 500m split off a Concept2 monitor and returns the watt, calorie and projected-split numbers New Zealand programmes lean on for erg trials. The watt figure comes straight from the canonical Concept2 cubic relationship between pace and power. Long-piece projections use the Riegel endurance fade, so a sharp 2k input maps to a realistic 5k or 6k target. Maadi squads lean on it through trial blocks, NZ University crews calibrate to it before Bond Cup selection, and masters scullers use it to back out age-graded targets across a Karapiro masters build.
Inputs
Most squad-grade efforts in NZ programmes sit between 1:25 (Rowing NZ shortlist) and 2:30 (first session of pre-Maadi trial).
Jump to a typical squad band
Indicative bands: social masters 100-200W; trained Kiwi open-club and NZURA squads 250-350W; Rowing NZ shortlisted athletes routinely above 400W.
Split per 500m
Projected splits across each test distance
Score predictor
Splits open up as the piece gets longer. The projections below run the Riegel fade with rowing-tuned coefficients, so a 2k input maps cleanly to a realistic 5k, 6k or 10k.
| Test piece | Projected finish | Held split | Average watts |
|---|---|---|---|
Method behind the numbers
Reading a 500m split off the PM5 monitor
Split is the projection metric every Concept2 ergometer in a Kiwi boatshed runs on. It is the finishing time the monitor predicts for the next 500 metres if the upcoming strokes match the recent strokes. Smaller number, faster boat. Pulling 1:42.5 means the next half-kilometre is on track for 1 minute 42 and a half seconds, and a flat-out 2k at the same effort would land on 6:50. The big Maadi schools (Hamilton Boys, Saint Kentigern, Christ's College, St Andrew's) capture splits stroke-by-stroke through the PM5 because the season-long trend exposes things a paper logbook quietly hides. Squad-wide erg telemetry only delivers when the data is captured automatically.
Turning 500m split into watts on a Concept2 RowErg
Concept2 ties pace to power through a single cubic relation: P = 2.80 / (sec_per_500 / 500)^3. The cube on the denominator is brutal. Halve the pace number and watt output goes up by a factor of eight, which is why the climb from a 1:50 toward a 1:40 costs roughly four times the energy of the climb from a 2:00 toward a 1:50. Kiwi programmes that benchmark on watts (rather than leaning on split alone) spot lightweights overreaching on short pieces and openweight athletes coasting on long ones, then feed the corrected scores into the squad practice record.
Where the kcal/hr figure on the PM5 actually comes from
The Concept2 PM5 lifts watt output into an hourly kilocalorie estimate via kcal/hour = 4 x watt_output + 300. The standing 300 represents resting metabolic rate during exercise. Identical arithmetic drives the kcal column on this tool, so the displayed value matches the on-screen reading mid-piece and ties into the weekly volume totals the coach dashboard rolls up across a winter Karapiro build or the long lead-in to Maadi week at Lake Ruataniwha. Real burn rate shifts with body mass, muscle composition and boatshed temperature, so use the figure as a session-to-session training-load proxy rather than a dietitian-grade calorie ledger.
Swapping pace for time and back again
A converter does two jobs at once. Hand it a split and it returns finishing times across every test distance. Hand it a finishing time at one distance and it returns the average split that produced it. Both directions reduce to a single line of arithmetic: finishing time equals split multiplied by the number of 500-metre segments in the distance. Worked through at a 1:48 setpoint, that lands at 7:12 over the Olympic 2k, 18:00 across 5k and 21:36 across the 6k. The form above runs both directions instantly and stamps matching watt and kJ figures alongside each row.
Behind the longer-distance predictor
For longer pieces we lean on the Riegel endurance relation: projected time equals base time multiplied by the distance ratio raised to a 1.06 fade exponent. That exponent is the canonical fade observed across running, swimming and rowing test data, and tracks Kiwi erg scaling cleanly in practice. Treat the output as the opening conversation, not the verdict. Lightweights and Year 10 Maadi rowers usually fade harder than the curve suggests, while big aerobic engines (a 95kg heavyweight stroke seat, a Rowing NZ shortlisted lightweight) hold pace better than the model predicts. Use the projection to open the chat with the coach about realistic 6k or pre-Maadi goals, then sharpen it once a real long piece is on the books.
The five intensity bands a Kiwi programme actually runs
Rowing NZ coach education pathways and most NZURA and Maadi squads run a five-band weekly structure pegged to the 2k split. Numbers below are typical setpoints (rate, then pace offset relative to your 2k):
- UT2 - steady aerobic: rate around 18-20, sit roughly 12 to 15 seconds slower than race pace per 500.
- UT1 - firm aerobic: rate around 22-24, run about 8 to 10 seconds slower than race pace per 500.
- AT - anaerobic threshold: rate around 26-28, hold within 4 to 5 seconds of race pace per 500.
- TR - transport (race pace): rate climbs into the 30-34 band, pace lands on the 2k split itself.
- AN - anaerobic: rate above 36, splits drop below 2k pace, usually short pieces only.
Once the 2k split is locked in, every other zone falls out of it. The standard fix when the 2k is months stale is to drive a recent long aerobic piece through the predictor table, take that as the working figure, and feed it into the training pace tool to lift out the splits, rates and watts a coach actually writes on the whiteboard.
Indicative erg marks across Kiwi standard test distances
Indicative numbers drawn from real Kiwi programmes, framed for openweight male rowers. Rowing NZ contenders typically shift each column down by five to fifteen seconds per 500m. Openweight female benchmarks usually run around eight to twelve seconds outside these figures. Masters and junior categories need to be read alongside the Concept2 age-grade tables, not directly against the open numbers:
- 500m flying piece: club rowers chase 1:25, regional squad shortlist around 1:20, Rowing NZ contenders under 1:15.
- 1k: open club around the 3:10 mark, regional squads inside 3:00, national standard inside 2:50.
- 2k Olympic test: open-club rowers chase the 6:50 mark; sharp Maadi 1st VIII and NZURA rowers push under 6:30; Rowing NZ shortlist opens at 6:15; national elite men sit beneath 6 minutes flat.
- 5k aerobic test: open clubs target 18 minutes flat; NZURA squads chase 17; Rowing NZ shortlisted athletes inside 16:30.
- 6k winter anchor: open clubs around 22 minutes; NZURA and Maadi 1st VIII aim for 20:30; Rowing NZ openweights under 19:30.
- 10k base piece: club rowers around 38 minutes; NZURA 1st VIII around 35; Rowing NZ openweights inside 33:30.
Rowing NZ high-performance standards sit in the same neighbourhood as the figures above. What changes between programmes is squad depth and recruiting class, not the watts on the flywheel. Year 11 to Year 13 rowers chasing the Maadi Cup typically benchmark against the previous year's 1st VIII trial sheet from their own school, while open-age athletes calibrate to Rowing NZ shortlist standards, NZURA Bond Cup figures and Karapiro winter training-camp testing. Masters crews should always push the raw split through age-graded percentiles before drawing conclusions. For a percentile-band placement with bodyweight and age handicapping built in, jump straight to the erg score percentile tool. And for back-solving a credible Olympic-distance goal off a long aerobic piece, the 2k projection utility is the next stop.
One athlete on one erg is arithmetic. A whole squad across a Maadi build is a system.
One split is a pocket-calculator job. A whole squad's erg history across a Karapiro winter block, a pre-Maadi camp at Lake Ruataniwha and the spring sprint regattas is a database problem. Row HQ writes every score against the right athlete the moment it lands, so the coach pulls crew lineups from live data, catches a Year 12 sculler quietly going backwards via administrator-side dashboards, and stops trawling Messenger threads or last fortnight's spreadsheet to find a PB.
Take a look at the Oundle Town RC case study for how a working club turns erg numbers into selection-night decisions, work through the practical guide to getting actual value out of squad erg data, or step through the practice tracking features that record every split with zero coach data entry. Set that next to the shared spreadsheet routine still running in most Kiwi boatsheds and the case writes itself.
Frequently asked questions
So what does the 500m split number actually mean?
It is the rolling projection the PM5 monitor shows in mm:ss.t format, so a reading of 1:42.7 means one minute, forty-two seconds and seven tenths. The number forecasts the finishing time over the next half-kilometre at the current effort. Smaller number, faster boat. Kiwi squads anchor zones, race plans and athlete comparisons on the split because it is unambiguous, repeatable across machines, and converts straight to boat speed the moment a crew pushes off at Karapiro, Ruataniwha or Lake Hood. Programmes that capture every practice split automatically spot slumps weeks before they surface in race results.
How do I work out watts from a given 500m split?
Concept2 publishes the relationship as watt output equal to 2.80 divided by the cube of pace-seconds-per-500 normalised by 500: P = 2.80 / (sec_per_500 / 500)^3. Run the equation at 1:55 (115 seconds total): the maths gives you around 230 watts. Drop to a 1:35 (95 seconds total) and the figure climbs to roughly 408 watts. The cube term on the denominator is what hurts. Halve the pace number and watt output multiplies by eight. That is precisely why dragging the split number down from 1:50 toward 1:40 is a fundamentally different ask than the climb from 2:00 toward 1:50. The tool runs the canonical equation, so the watt column reconciles cleanly with the PM5 in front of you and with the values piped into your programme's coach dashboard.
Where should a Kiwi rower expect a 2k erg score to land?
The honest answer is it depends on weight, age, gender and training history. A fit social rower under 7:30 is doing well. Competitive openweight men typically chase under 6:30 and lightweights under 7:00. Elite openweight women land around 7 minutes flat, elite openweight men around 6 minutes flat. Strong U19 athletes can match senior figures given a proper programme behind them. Maadi 1st VIII rowers usually sit between 6:25 and 6:50 by the time selection comes around, and NZURA 1st VIII athletes typically push for under 6:30, while masters athletes should always run the score through the Concept2 age-graded tables before any of those open columns are meaningful as a comparison. For a deeper look at how to actually act on these numbers across a season, work through the Row HQ playbook on squad-wide erg telemetry.
Translating an Olympic 2k score into a projected 6k pace?
Splits drift outward as the piece gets longer. Most Kiwi programmes work with a rough rule that splits open up by around five seconds per 500 every time the distance doubles. So a 1:42 at 2k usually lands around 1:47 over 5k and around 1:49 across 6k. The predictor table sharpens that estimate using the Riegel relationship: predicted = base * (new_distance / base_distance)^1.06. The 1.06 exponent is the canonical endurance-sport fade and tracks NZ erg testing well across school and club programmes. Lightweights and Year 10 athletes typically fall off faster than the model; big-engine heavyweights hold pace better. Calibrate accordingly when sizing up a 6k off a recent sharp 2k.
How does the kcal/hr number on the PM5 monitor get calculated?
Concept2 derives the per-hour kilocalorie figure with kcal/hour = 4 x watt_output + 300. The fixed 300 stands in for basal metabolism during exercise. Identical maths runs in this tool, so the kcal estimate aligns with the on-screen reading during a piece. Treat it as approximate. Real burn shifts with body composition, boatshed temperature and warm-up state, but the result is repeatable enough across sessions to act as a relative training-load metric when planning fuelling through a heavy Karapiro winter camp or pre-Maadi taper.
What 5k score should a Kiwi squad rower be chasing?
Under 19 minutes across the 5,000m piece is a respectable mark for a fit social rower. Open-club male openweights tend to push beneath 18, NZURA university athletes inside 17, and Rowing NZ shortlisted openweights step inside 16 minutes 30. The equivalent for openweight female athletes typically runs around a minute to a minute and a half back at each tier. The 5k usually rates in the 24 to 26 stroke band and sits a touch below anaerobic threshold. Quick cross-check: the average pace per 500 on a 5k typically lands eight to twelve seconds outside the matching Olympic-distance split.
Where does a good 6k erg score land in NZ programmes?
For a fit social rower, breaking 22 minutes over 6,000m is a respectable mark. Open-club squad athletes typically push under 21 minutes, NZURA 1st VIII rowers under 20, and Rowing NZ shortlisted openweights with national selection in view sit under 19:30. The 6k is the winter anchor across most New Zealand club and university programmes, rated 24 to 26 strokes per minute. Pencil the average pace per 500 on a 6k as roughly ten to twelve seconds outside the equivalent Olympic-distance pace. Push a recent 6k score through the predictor table to reverse-engineer a credible 2k goal.
Companion tools in the Aotearoa erg suite
Erg Score Percentile Tool
Position any score on a percentile band with bodyweight handicap and Concept2 age-grading factored in, sized for Maadi, NZURA and masters selection.
Training Pace Calculator
Spit out UT2, UT1, AT, TR and AN setpoints with rate windows and clean interval blocks ready to write on the boatshed whiteboard.
Rowing Pace Chart
Single-screen pace lookup across every test distance, colour-banded by intensity zone for Karapiro camp and Maadi prep.
2k Prediction Calculator
Back-solve a credible 2k target from a recent long aerobic test (5k, 6k, 10k, or a thirty-minute trial).
Rowing terms worth knowing
Plenty more in the Row HQ rowing glossary, including the ergometer, the rowing shell explained, sculling versus sweep, every Kiwi boat class from single to coxed eight, a definition of regatta, the role of the coxswain, and why catching a crab buries a crew.
One athlete, one calculator. Thirty athletes, one Row HQ.
Row HQ stores every erg test, split and PB next to the right athlete automatically, sized for selection nights and trend monitoring through a winter Karapiro build and pre-Maadi taper. Built by rowers, deployed at the OTRC flagship club.
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