The Session RPE Load Calculator is a free online tool that measures how much load a session created, using its duration and how hard it felt, in the simple form coaches call session-RPE load. It runs fully in your browser, needs no sign-up, and gives you a clear result in seconds, so you can use it at the track, in the gym, or at home without installing anything or sharing personal data.
This tool works from simple numbers you already know or can measure in one session. You enter the session duration in minutes, a rating of perceived exertion from 1 to 10, and how many sessions you do each week. The tool then applies a standard formula to those numbers, so the result follows the same maths every time and two people who enter the same inputs always get the same output.
Your result shows the load for one session, which is minutes times RPE, and the weekly load, which multiplies that session load by your sessions per week. Read the main number first, then look at the extra figures, because they often explain the result better than a single score alone. A result that looks odd usually points to a typing error or a unit mix-up, so check your inputs before you trust an extreme value.
Here is a worked example to make the maths concrete. In this example, sixty minutes at an RPE of 7 gives a session load of 420, and five such sessions a week give a weekly load of 2,100, which is a busy training week. Try the same numbers in the tool yourself, then change one input at a time, and watch how the result moves, because that habit teaches you far more than reading a formula on its own.
How should you read the result in practice? In general, session loads near 300 feel moderate, loads near 500 feel hard, and weekly loads that jump sharply from one week to the next are worth watching closely. Use the result to compare your own tests over time, not to judge yourself against strangers online, because age, sport, training history, and test conditions all change what a good number looks like for you.
To get the most from this tool, follow a few simple habits. First, rate the session about thirty minutes after it ends, not during the hardest minute, and use the same 1-to-10 scale every time so your weeks stay comparable. Second, test under similar conditions each time, with the same warm-up and the same course or equipment, so changes in the number reflect changes in your fitness rather than changes in the test itself.
Watch out for common mistakes, because small errors can move the result a lot. The most frequent problem is rating every session as a 9 or 10, because when every day looks maximal, the numbers lose their meaning and cannot show which days were truly hard. A second common problem is entering numbers in the wrong units, for example minutes instead of seconds, or pounds instead of kilograms, so double-check the unit labels on every field.
Finally, keep the limits of this tool in mind. In short, perceived exertion is personal, so this tool gives an educational estimate for planning and tracking, not a medical reading or a diagnosis of fatigue. Used with that care, this free tool becomes a practical part of your training routine, giving you honest numbers you can track week after week without cost, accounts, or complicated software.
If you test regularly, keep a simple log with the date, your inputs, and your result, because a short written record shows progress far better than memory alone. Review the log once a month, look for slow steady improvement rather than daily jumps, and adjust your training only when a pattern holds for several weeks, not after a single unusual test.
Version en espanol: Calculadora de Carga RPE de Sesión – Solo Estimación Educativa