THE CALCULATORS
You will find on yousuli.co an extensive list of calculators, that I made for the community at large, free of charge.
Why? The reason is simple, triathlon, and endurance sports in general is hard enough. This is one of the many ways I try to help. So if you are an athlete or a coach, feel free to use them and share them if you like them. You are also invited to send me feedback, I make mistakes and things can always be improved.
Lastly if you are in the Los Angeles area, consider going the Yousuli club, it is an easy way to stay connected. And of course, if you are looking for some testing, or coaching, I would be very happy to help.
Running time predictor
Works to give you finish time estimate based on single point performance, or the other way around: tells you how was you should be able to go on set distance to get a PR for your A Race.
Triathlon finish time
Choose a race distance, input your paces and transition time to see cumulative, and finish time and check if you are DQ. Useful also for checking if finishing within a certain time is possible.
Intraworkout fueling
Useful reminder to know how much to consume during training, enter duration and fueling mode (minimal, recommended, and max) and see suggested fueling intake.
Triathlon race day fueling
Enter pace and power strategy for your race, as well as "a hell" of other things, to print out a race day fueling strategy.
*highly recommended to maintain performance during long events.
Sweat rate calculator
Type in duration, weight before, weight after, amount of liquid consumed to get sweat rate and approximate sodium rate loss.
Triathlon calorie burn
Another quick way to estimate how many calories you are burning when you train.
All in one
Mix back of conversion calculations, from swimming paces to temperatures, and concentrations. Useful when traveling or when you want to check a finish time into pace or vice versa.
CSS calculator
Critical swimming speed calculator. Enter two distances (100-400 200-400 or whatever you feel like) to get your CSS, estimated finish time in different swim length as well as training zones.
EBTI:
Efficiency battery test for swimming I, this one looks at your height, stroke rate, and distance per stroke to tell you if you gain more to increase stroke rate, or to improve your DPS.
EBTII
Similar to EBTI, EBTII looks at different sets of 50m or yard, at different stroke rate to highlight tipping points where efficiency plummets, and also shows you ranges of normal DPS/SR at given speeds.
Gear ratio table
A simple gear ratio table to understand how the chainring cogs (front) on your bike, and the cogs on the cassette, play together to turn the wheels a certain numbers of times.
Gear X Speed X Power
An advance version of the gear table, in which speed, and power output are given out.
*Useful for checking gears for climbs
Calipers to body composition
How to calculate body fat percentage, and lean body mass using calipers to ensure that weight loss is not muscle loss.
RMR calculator
Different ways to calculate your resting metabolic rate, the energy your body needs to maintain functions at rest. Eating below RMR can lead to health and performance issues.
Strength training intensity guide
How much to train during each phase of your training plan from early base to race. Intensities, sets, rest intervals and even example of exercises.
RPE > RER
A silly attempt to link rate of perceived exertion to respiratory exchange ratio to determine how much of the energy you burn is coming from fat and how much is coming from carbs.
Macro
A guide to meet your total daily energy expenditure taking into account your training, your resting metabolic rate and more.
Tyre pressure guide
Improve safety, speed and comfort with correct tyre pressure for toad bikes, mountain bikes, recumbent bikes, tandems and more.
Critical power
Go beyond FTP and estimate your critical power using three maximal efforts to fully appreciate your anaerobic and aerobic capacity.
Power to finish
Choose a race, enter some data about you and your power strategy to see finish time, race map, technical segments including climbs, descents and hard turns. (it actually does more)
CdA estimate
Enter manually data or load directly a fit file to estimate your coefficient of aerodynamic drag (CdA).
*Strongly recommended if you like to go faster at same power
Crr calculator
Reversed calculator that will work if you know power, speed, and CdA. This is meant to give you, or to confirm your tyre rolling resistance.
*recommended with aero sensor data
Running HR zones
Simple pacing strategies using heart rate data.
Advanced running predictor
Advanced running predictor using your best 400m, 1600m, and 5000m runs.
*Recommend to use in conjunction with the single point calculator
Reactive Strength index
RSI or reactive strength index is measured via a simple test, and can help estimate how much bounce, and free speed you can get in running.
*Strength training, and plyometrics are your friends.
Boston qualifier calculator
Enter your age group to quickly check how fast you have to run to make it to Boston (without having to donate a gazillion dollars)
IM & IM70.3 worlds qualifier
Quick way to check if you are competitive enough for worlds, and for podiums. Uses the 2026 maths.
Fit File Compare
Compare up to three FIT files from different devices. Visualise power, heart rate, cadence and speed, check data quality, before your next race.
Mutlisport (fit) Breaker
Multisport FIT file splitter for triathletes and cyclists. Upload a multisport FIT, adjust leg boundaries, and export for WKO or TrainingPeaks, and others