{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"rowing-split"},"result":{"entity_type":"calculator","id":"rowing-split","calculator_id":"rowing-split","canonical_url":"https://tttkmbb.com/fitness/rowing-split","name":"Rowing Split Calculator","title":"Rowing Split Calculator – 500 m Split, Pace, Watts and Calories (Concept2 Formulas)","category":"fitness","category_name":"Sports & Fitness","tool_name":"calculate_rowing_split","featured_mcp_tool":false,"description":"Converts an indoor-rowing distance and time (or a 500 m split) into the split per 500 m, pace per km, speed, power in watts using Concept2's watts = 2.80 / pace³ and the Performance Monitor's calorie rate, weight-adjusted when body weight is given.","use_when":"You want the split, watts or calories for an erg piece, need to convert a target split into watts (or a wattage into a split) or want the finish time for a distance at a given split.","do_not_use_when":"You are rowing on water (boat speed depends on hull and crew, and no watts are displayed) or you need running or swimming pace (use running-pace or swim-pace).","inputs":[{"name":"distance_m","label":"Distance","type":"number","unit":"m","required":false,"max":1000000,"exclusive_min":0,"description":"Distance rowed in metres (e.g. 2000). Give it with time, or with split_per_500m to get the finish time.","example":2000},{"name":"time","label":"Time","type":"string","required":false,"description":"Elapsed time for distance_m as h:mm:ss, mm:ss (8:00) or plain minutes.","example":"8:00"},{"name":"split_per_500m","label":"Split per 500 m","type":"string","required":false,"description":"Pace per 500 m as m:ss or m:ss.s (2:00.5); used when distance_m and time are not both given.","example":"2:00"},{"name":"weight_kg","label":"Body weight","type":"number","unit":"kg","required":false,"max":300,"exclusive_min":0,"description":"Optional rower weight for the weight-adjusted calorie rate (the monitor assumes 79.5 kg / 175 lb).","example":75}],"outputs":[{"name":"split_per_500m","label":"Split per 500 m","type":"string","unit":"m:ss.s/500 m","decimals":4,"description":"Time per 500 metres, as shown on the monitor."},{"name":"split_seconds_per_500m","label":"Split (seconds)","type":"number","unit":"s/500 m","decimals":1,"description":"Same split as a number of seconds."},{"name":"watts","label":"Power","type":"number","unit":"W","decimals":1,"description":"Concept2: watts = 2.80 / (split_seconds / 500)³."},{"name":"pace_per_km","label":"Pace per km","type":"string","unit":"min:sec/km","decimals":4,"description":"Time per kilometre (2 × split)."},{"name":"speed_m_per_s","label":"Speed","type":"number","unit":"m/s","decimals":3,"description":"500 / split_seconds."},{"name":"speed_kmh","label":"Speed","type":"number","unit":"km/h","decimals":2,"description":"Same speed in km/h."},{"name":"calories_per_hour","label":"Calorie rate","type":"number","unit":"kcal/h","decimals":0,"description":"Performance Monitor rate 4 × watts × 0.8604 + 300, with 300 replaced by 1.714 × weight_lb when weight_kg is given."},{"name":"time","label":"Time","type":"string","unit":"h:mm:ss","decimals":4,"description":"Elapsed time for distance_m (given or computed from the split)."},{"name":"distance_m","label":"Distance","type":"number","unit":"m","decimals":0,"description":"Distance of the piece, when given."},{"name":"calories_kcal","label":"Calories for the piece","type":"number","unit":"kcal","decimals":0,"description":"calories_per_hour × time / 3600 (only when the duration is known)."}],"input_schema":{"type":"object","properties":{"distance_m":{"description":"Distance rowed in metres (e.g. 2000). Give it with time, or with split_per_500m to get the finish time. Unit: m.","type":"number","maximum":1000000,"exclusiveMinimum":0,"examples":[2000],"x-unit":"m"},"time":{"description":"Elapsed time for distance_m as h:mm:ss, mm:ss (8:00) or plain minutes.","type":"string","examples":["8:00"]},"split_per_500m":{"description":"Pace per 500 m as m:ss or m:ss.s (2:00.5); used when distance_m and time are not both given.","type":"string","examples":["2:00"]},"weight_kg":{"description":"Optional rower weight for the weight-adjusted calorie rate (the monitor assumes 79.5 kg / 175 lb). Unit: kg.","type":"number","maximum":300,"exclusiveMinimum":0,"examples":[75],"x-unit":"kg"}},"additionalProperties":false},"output_schema":{"type":"object","properties":{"split_per_500m":{"description":"Time per 500 metres, as shown on the monitor. Unit: m:ss.s/500 m.","type":"string","x-unit":"m:ss.s/500 m"},"split_seconds_per_500m":{"description":"Same split as a number of seconds. Unit: s/500 m.","type":"number","x-unit":"s/500 m"},"watts":{"description":"Concept2: watts = 2.80 / (split_seconds / 500)³. Unit: W.","type":"number","x-unit":"W"},"pace_per_km":{"description":"Time per kilometre (2 × split). Unit: min:sec/km.","type":"string","x-unit":"min:sec/km"},"speed_m_per_s":{"description":"500 / split_seconds. Unit: m/s.","type":"number","x-unit":"m/s"},"speed_kmh":{"description":"Same speed in km/h. Unit: km/h.","type":"number","x-unit":"km/h"},"calories_per_hour":{"description":"Performance Monitor rate 4 × watts × 0.8604 + 300, with 300 replaced by 1.714 × weight_lb when weight_kg is given. Unit: kcal/h.","type":"number","x-unit":"kcal/h"},"time":{"description":"Elapsed time for distance_m (given or computed from the split). Unit: h:mm:ss.","type":"string","x-unit":"h:mm:ss"},"distance_m":{"description":"Distance of the piece, when given. Unit: m.","type":"number","x-unit":"m"},"calories_kcal":{"description":"calories_per_hour × time / 3600 (only when the duration is known). Unit: kcal.","type":"number","x-unit":"kcal"}}},"formula":"split_s = time_s × 500 / distance_m (or time_s = split_s × distance_m / 500); pace = split_s / 500 (s/m); watts = 2.80 / pace³; speed = 500 / split_s; calories_per_hour = 4 × watts × 0.8604 + 300 (monitor, 175 lb rower) or 4 × watts × 0.8604 + 1.714 × weight_lb (weight-adjusted); calories = calories_per_hour × time_s / 3600","method":"watts = 2.80/pace³ and the weight correction (true kcal/h = monitor kcal/h − 300 + 1.714 × weight in lb) are Concept2's published formulas. The monitor's rate itself follows from 25 % mechanical efficiency (× 4) and 1 W = 0.8604 kcal/h (3600/4184) plus a 300 kcal/h base for a 79.5 kg rower; it is an estimate, not a measurement.","sources":[{"name":"Concept2 – Watts Calculator (watts = 2.80 / pace³, pace in seconds per metre)","url":"https://www.concept2.com/indoor-rowers/training/calculators/watts-calculator","type":"reference","retrieved_at":"2026-09-24"},{"name":"Concept2 – Calorie Calculator (Performance Monitor calories are based on a 175 lb / 79.5 kg rower; correction 1.714 × weight in lb)","url":"https://www.concept2.com/indoor-rowers/training/calculators/calorie-calculator","type":"reference","retrieved_at":"2026-09-24"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"2000 m in 8:00","inputs":{"distance_m":2000,"time":"8:00"},"expected":{"split_per_500m":"2:00.0","split_seconds_per_500m":120,"watts":202.5,"pace_per_km":"4:00","speed_m_per_s":4.167,"speed_kmh":15,"calories_per_hour":997,"time":"0:08:00","calories_kcal":133},"url":"https://tttkmbb.com/api/v1/calculate/rowing-split?distance_m=2000&time=8%3A00"},{"name":"2:30 split, 90 kg rower","inputs":{"split_per_500m":"2:30","weight_kg":90},"expected":{"split_seconds_per_500m":150,"watts":103.7,"pace_per_km":"5:00","speed_kmh":12,"calories_per_hour":697},"url":"https://tttkmbb.com/api/v1/calculate/rowing-split?split_per_500m=2%3A30&weight_kg=90"}],"faq":[{"q":"How do I convert watts back to a split?","a":"split_seconds = 500 × (2.80 / watts)^(1/3). For example 200 W gives 120.5 s, a 2:00.5 split."},{"q":"Why does halving the split not double the watts?","a":"Power rises with the cube of speed: going from 2:00 to 1:50 (9 % faster) needs about 30 % more watts (202 → 263 W)."},{"q":"Are the calories accurate?","a":"They are the monitor's estimate for a 79.5 kg rower; with weight_kg the base rate is scaled by weight. Individual efficiency varies, so treat ±15 % as normal."}],"tags":["rowing split calculator","500m split","erg watts","concept2 pace to watts","rowing calories","indoor rowing pace"],"related":[{"calculator_id":"calories-burned","reason":"MET-based energy estimate for rowing at a fixed intensity."},{"calculator_id":"swim-pace","reason":"Pace per 100 m for swimming pieces."},{"calculator_id":"power","reason":"Convert watts to other power units."}],"links":{"html":"https://tttkmbb.com/fitness/rowing-split","markdown":"https://tttkmbb.com/fitness/rowing-split.md","json":"https://tttkmbb.com/fitness/rowing-split.json","api":"https://tttkmbb.com/api/v1/calculate/rowing-split","schema":"https://tttkmbb.com/api/v1/calculators/rowing-split","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-24"},"timestamp":"2026-09-24T01:57:29Z"}