Combat Conditioning Calculator
Work-to-rest ratios for sport-specific conditioning.
About this calculator
This calculator turns a round/rest structure into concrete physiological targets for combat-sport conditioning. Max heart rate uses the Tanaka formula (208 − 0.7 × age), which tracks real HRmax more closely across the adult age range than the older "220 minus age" rule of thumb; anaerobic threshold is set at 87% of that max (the zone where lactate starts piling up faster than it clears) and an aerobic floor at 70%. Your work:rest ratio is just round duration divided by rest duration, and it's compared against sport-specific ideal ratios baked into the code — boxing's 3.0, MMA's 2.0, Muay Thai's 2.5, wrestling's 1.5 — reflecting how continuously each sport is actually contested; the conditioning score is simply how close your ratio comes to that target, capped at 100.
Target work-interval heart rate is max HR scaled by a sport-specific average-intensity multiplier (fixed in the code, not derived from your inputs), while target rest-interval heart rate is a flat 65% of max HR for every sport — it doesn't vary with sport type the way the work target does, so treat it as a general recovery benchmark rather than a discipline-specific one. Calorie burn uses a MET-based estimate (roughly 10 METs baseline, adjusted by sport intensity) applied only to your total work time, not rest periods, so it undercounts session-total energy expenditure if you count rest as part of "training time." The weekly round target is a flat 4× your rounds-per-session, a training-volume rule of thumb rather than an individualized prescription. Treat the heart-rate numbers as estimates — actual max HR varies by up to ±10-15 bpm between individuals of the same age, so a chest-strap-measured HRmax will always be more accurate than any formula.
Step 1 of 2
How to Use This Calculator
- Enter your age and body weight, plus round duration, number of rounds, and rest between rounds for your training session.
- Select your sport type — Boxing, MMA, Muay Thai, or Wrestling — to apply sport-specific intensity and ideal work:rest benchmarks.
- Review your work:rest ratio along with total work and total session time.
- Check your estimated max heart rate, anaerobic threshold, and target work/rest heart rates, plus estimated calories burned.
- Use the conditioning score and weekly round target to gauge how your session structure compares to sport-ideal ratios.
How the result changes with Rest between rounds (sec)
| Rest between rounds (sec) | Work:Rest ratio |
|---|---|
| 30 | 10 |
| 45 | 6.67 |
| 90 | 3.33 |
| 150 | 2 |
What each input means
- Age
- Athlete's age in years (used for max heart rate).
- Body weight (kg)
- Current body weight in kilograms.
- Round duration (sec)
- Length of each work round in seconds (e.g. 180 for MMA, 300 for boxing).
- Number of rounds
- Total rounds per conditioning session.
- Rest between rounds (sec)
- Rest period between work intervals in seconds.
- Sport type
- Combat sport discipline: 0 = Boxing, 1 = MMA, 2 = Muay Thai, 3 = Wrestling.
What each result means
- Work:Rest ratio
- Ratio of work duration to rest duration (e.g. 5.0 means 5:1).
- Total work (min)
- Total active work time in minutes.
- Total session (min)
- Full session duration including rest periods.
- Est. max HR (bpm)
- Estimated maximum heart rate using Tanaka formula.
- Anaerobic threshold (bpm)
- Heart rate at ~87% of max — lactate accumulation zone.
- Target work HR (bpm)
- Heart rate to sustain during work intervals.
- Target rest HR (bpm)
- Heart rate to recover to during rest intervals.
- Est. calories burned
- Estimated calories burned during work intervals.
- Conditioning score
- Score 0-100 comparing your work:rest ratio to sport-ideal benchmarks.
- Weekly round target
- Recommended total rounds per week (4 sessions).
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersAge = 25, Body weight (kg) = 75, Round duration (sec) = 300, Number of rounds = 3 = 6 input(s) provided
- Calculate Work:Rest ratioWork:Rest ratio = roundDurationSec / max(1, restBetweenSec)5 = 5
- Calculate Total workTotal work = round((totalWorkSec / 60) * 10) / 1015 = 15
- Calculate Total sessionTotal session = round((totalSessionSec / 60) * 10) / 1017 = 17
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does my conditioning score change if I don't change my work or rest time?
The conditioning score compares your work:rest ratio against a sport-specific ideal ratio hardcoded per discipline — boxing targets 3.0, MMA 2.0, Muay Thai 2.5, wrestling 1.5 — and the score is (your ratio ÷ ideal ratio) × 100, capped at 100. So switching the sport type alone changes the score even with identical round and rest durations, since a work:rest ratio that's near-ideal for boxing's more continuous pace can be well off target for wrestling's shorter, more explosive exchanges.
Why is my target rest heart rate the same regardless of which sport I pick?
Target rest HR is calculated as a flat 65% of your estimated max heart rate for every sport type, unlike target work HR which uses a sport-specific intensity multiplier. This is a general recovery benchmark rather than a discipline-tuned one — the calculator treats how fast you should recover between rounds as roughly sport-independent, even though how hard you work during rounds is not.
Does the calorie estimate include the rest periods between rounds?
No. Calories are estimated from a MET value applied only to totalWorkSec (work time), not the rest intervals between rounds — so a session with long rest periods relative to work time will undercount your true session-total energy expenditure. The MET value itself starts at a baseline of 10 and scales with your sport's intensity multiplier (0.78–0.85 depending on discipline).
Why does the Tanaka formula give a different max heart rate than 220 minus my age?
This calculator uses 208 − 0.7 × age rather than the older 220 − age rule. For a 25-year-old, Tanaka gives about 190.5 bpm versus 195 bpm from the old formula; the gap widens with age because Tanaka's slope (0.7 per year) is shallower than the old formula's slope of 1.0 per year, and research shows Tanaka tracks measured HRmax more accurately across the adult age range, especially past 40.
How is the weekly round target calculated, and is it personalized?
Weekly round target is simply your rounds-per-session multiplied by 4, representing a baseline assumption of 4 training sessions per week — it doesn't factor in your age, experience, or conditioning score. Treat it as a rough starting point for volume planning, not an individualized prescription; someone conditioning for a title fight and someone doing recreational sparring at the same rounds-per-session will get the identical weekly target.
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