Body Fat Percentage Calculator
Estimate adult body fat percentage from circumference measurements using the U.S. Navy method.
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Why Does Weight Fluctuate Day to Day?
Weight can fluctuate day to day because the scale measures everything in your body at that moment—not only body fat. Fluid, food and drink, bowel contents, menstrual changes, exercise recovery, medicines, and measurement conditions can all move the number. Compare readings taken under similar conditions, look at a longer trend, and get medical advice for sudden unexplained change or swelling.
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Circumference estimate
26.8%
This screening estimate can differ from clinical body-composition tests and should not be used to diagnose a condition.
These results are educational estimates, not a diagnosis or treatment plan. For personal medical advice, pregnancy guidance, chronic conditions, eating concerns, or medication decisions, speak with a qualified health professional.
Related guides
Read practical articles connected to this calculator.
Why Does Weight Fluctuate Day to Day?
Weight can fluctuate day to day because the scale measures everything in your body at that moment—not only body fat. Fluid, food and drink, bowel contents, menstrual changes, exercise recovery, medicines, and measurement conditions can all move the number. Compare readings taken under similar conditions, look at a longer trend, and get medical advice for sudden unexplained change or swelling.
Fitness & MovementWeighted Vest Walking: A Beginner Safety Plan Before You Add Load
A weighted vest can make a familiar walk feel harder, but the useful question is not how heavy to go. It is whether load belongs on your walk yet.
Fitness & MovementHow to Maintain Muscle While Losing Weight on GLP-1s
Successful weight loss is not only about losing pounds. Strength, function, and protein intake deserve a place in the plan.
GLP-1 & Weight ManagementGLP-1 Hair Loss: What to Track Before You Treat It
GLP-1 hair loss is reported with some weight-management medicines, but a prescription name alone cannot tell you why your hair is shedding. Record the timing, pattern, weight and appetite changes, nutrition difficulties, scalp symptoms, illnesses, and other medicines. Bring that record to your prescriber or a dermatologist before changing treatment or buying supplements.
How to use this result
Use the estimate as a starting point for learning and planning. Recheck the inputs, compare the result with how you feel day to day, and ask a qualified professional before making major changes to diet, exercise, medication, or pregnancy-related decisions.