Key information
Keyboard support, focus, contrast, zoom and known limitations.
First define units, input range and the purpose of the calculation. Record results under comparable conditions so comparisons remain useful. One number cannot describe an entire run: surface, weather, elevation, fatigue and health can change the interpretation.
Example
A runner can calculate pace from a recent result, create splits and then save the actual session in the log. After several attempts, the comparison includes both time and notes about conditions.
Common mistake
Treating a prediction or arithmetic plan as a guarantee. Calculators organise numbers but cannot diagnose fatigue, injury or physical readiness.
Next step
Choose the right tool and review the methodology before making a training decision.