Acute-to-Chronic Training Ratio Calculator Calculate the ratio. The acute-to-chronic training ratio compares your mileage for the last week to your average weekly mileage for the last four weeks. If you’ve run 50, sickness 40, 50, and 60 miles in the past four weeks, your ratio is 60 (last week’s mileage) divided by 50 (average of last four weeks). That’s 1.2. Week Your Mileage Week 1 Week 2 Week 3 Week 4 Your acute-to-chronic ratio is […]