Cardio Standards & Race Time Calculators
Cardio progress gets vague fast unless you measure it properly. This page brings together the core FITTUX cardio calculators so you can convert pace into time, time into pace, and build targets you can actually hold under fatigue.
Random effort feels hard. Structured pacing gets results. Use these tools to understand where you stand and what to chase next.
5K Time & Pace Calculator (UK)
Use the 5k time calculator to convert pace into finish time, calculate 5k time splits, and see what a realistic 5km run time looks like.
Go to 5K Calculator10K Pace & Race Time Calculator (UK)
Use the 10k race time calculator to estimate finish time from your 10 km pace, or predict your 10km run time from a recent 5K.
Go to 10K CalculatorSkiErg Pace Calculator (HYROX 1,000m Split & Watts)
Use the SkiErg calculator to convert watts into a 500m split, set a 1,000m target time, and control your SkiErg pace under race conditions.
Go to SkiErg CalculatorHow to Use These Properly
Use a recent effort that reflects your current fitness. If your 5K time came from a crowded start or a windy course, treat it as a reference, not a verdict. For pacing work, aim for even splits first. Most “bad cardio days” are pacing mistakes, not a lack of fitness.
If your 5K prediction looks faster than your real-world 10K, you probably need more aerobic depth and better pacing discipline. If your SkiErg watts fall apart after the first 250m, it usually means your split is too aggressive for your current engine. The goal is not to impress the calculator. The goal is to make the numbers repeatable.