Running Pace Math: How to Convert Pace, Speed and Finish Time
Minutes per mile, miles per hour, finish time: they are all the same math. Here is how to switch between them quickly.
Health Metrics
How to Use a Sleep Calculator to Pick Your Bedtime
Waking up in the middle of a deep sleep cycle feels awful. A sleep calculator helps you time bedtime so you wake between cycles.
How to Measure Your Ring Size at Home Before Ordering a Smart Ring
Smart rings run thicker than regular rings, so sizing matters even more. Here is how to get a reliable measurement at home.
How Many Steps Are in a Mile? Turning Your Step Count into Distance
A mile is roughly 2,000 steps for many walkers, but your height and pace change that a lot. Here is how to find your own number.
What Is Your Max Heart Rate? Three Simple Formulas Compared
Your heart rate zones all hang on one number: your max heart rate. Here are three common formulas, how they differ and when to trust your watch instead.
Smart Ring Size Calculator: Find Your Size Before You Buy
A smart ring that is too loose gives poor sensor readings, and one that is...
Body Fat Calculator: Estimate Body Fat Percentage with a Tape Measure
Body fat percentage tells you more than weight or BMI alone, because it separates fat...
BMI Calculator: Check Your Body Mass Index and Healthy Weight
Body mass index, or BMI, is a quick screening number that compares your weight with...
TDEE Calculator: How Many Calories You Burn Per Day
Your total daily energy expenditure, or TDEE, is the number of calories you burn in...
Running Pace Calculator: Pace, Speed, and Race Time Predictions
Whether you just finished a parkrun or you are planning your first half marathon, pace...