Calculate equal-effort splits and analyze team performance for medley relay events. Built on world record pace ratios for accurate, physiologically grounded results.
Names appear on each leg card and in the copied text.
Drag right if a runner is faster than average for their event, left if slower. Each tick = 1% adjustment. The other legs absorb the difference so the total still hits your target.
Check a leg and enter a known split. That time stays fixed — the remaining legs adjust to still hit your target.
Enter each runner's personal record. Each leg card will show what % of their PR they'd need to run.
Save named reference times — school record, conference record, etc. After calculating, they appear in a ranked ladder.
How it works, who made it, and how to get in touch.
This calculator generates realistic, even-effort splits for medley relay events — the DMR (Distance Medley Relay), short SMR (Sprint Medley Relay) (100-100-200-400), and long SMR (200-200-400-800). Enter a target finish time, and it tells you how fast each runner should go. It also includes a performance analyzer: enter your team's actual splits from a race and it shows how evenly the work was distributed and how each leg compared to world record pace.
Each split is set so that every runner operates at the same percentage of the world record for their specific leg distance. If the team is running at 80% of WR pace, every single runner — regardless of whether they're running 100m or 1600m — is working at 80% of their event's WR. This ensures equal physiological effort across all four legs.
This method was chosen over alternatives like the Riegel formula (which models individual performance over varying distances for a single athlete) because medley relay legs are run by different people. What matters is equal relative effort per runner, not a single athlete's fatigue curve. WR ratios achieve that directly.
The optional runner weighting feature allows adjustments when your lineup isn't perfectly balanced — shifting a split ±20% while automatically redistributing the remainder across the other legs so the total always hits your target.
These are the world records the calculator uses. All figures are current as of 2025.
Note: The 1200m and 1600m are not standard standalone events. Their reference times are derived from world record pace at adjacent distances. The 1600m figure is scaled from the mile world record (1 mile = 1609.34m).
Kyle Doherty is a cross country and track & field runner at El Toro High School.
Never before had I run a DMR, so I decided to look online to find a simple calculator to help accurately pace my team and me. Lo and behold, this is a pretty niche subject, and therefore, the ones I found were blocked by district filters, pay-to-use, or just plain bad. So, I decided to commit several nights of research, calculations, and lost hours of sleep to coming up with the optimal way to calculate DMR splits. And while the solution I constructed certainly isn't the best way to do it, it's pretty dang close. Hey, I even got a couple of national qualifiers and decorated coaches to take a look at and validate the product, so that's pretty cool. Of course, this website will very likely be prone to bugs or errors, so please email me at the email shown below with any notes or recommendations on what you'd like changed. Go Chargers (not football).
If you find a bug, have a suggestion, or just want to say something, feel free to reach out.
Last updated March 9, 2026