This BMR calculator estimates the energy your body would use at rest to support essential functions such as breathing, circulation, and temperature regulation. It uses your age, sex, height, and weight to provide a practical resting-energy estimate.
BMR is not the same as maintenance calories. Daily energy needs also include movement, exercise, digestion, work, and other activity. Treat the result as an estimate for planning, not as a diagnosis or a prescription.
Basal metabolic rate is an estimate of resting energy expenditure under carefully controlled conditions. Most online calculators use a predictive equation rather than direct laboratory measurement.
Small differences between equations are normal. Weight trend, activity, body composition, health status, and measurement consistency can make a larger practical difference than a single decimal in the result.
BMR = 10 × weight + 6.25 × height − 5 × age + sex constantThe calculator combines body size and age with the selected equation constant to estimate resting daily energy expenditure.
Estimated maintenance calories = BMR × activity factorAn activity factor is a planning approximation and should be interpreted alongside real-world weight and performance trends.
Results are estimates and can vary with body composition, illness, pregnancy, medication, and the equation selected.
How is BMR estimated for an adult weighing 70 kg and measuring 175 cm?
What happens if weight changes from 70 kg to 75 kg?
Can height and weight be entered in imperial units?
Is BMR the number of calories to eat every day?
How can BMR estimates support a weight plan?
Should a medical condition be handled by this calculator?
A higher BMR estimate generally reflects greater body mass, height, or the equation inputs. It does not measure fitness, health, or the quality of a diet.
Use the value as a starting point, then compare it with observed energy, activity, and weight trends. Avoid treating a calculator estimate as an exact metabolic test.
Mixing pounds with kilograms or inches with centimetres.
Calling BMR a complete daily calorie target.
Changing several inputs without checking the units.
Ignoring body-composition, health, or medication factors.
Predictive equations can differ from measured resting metabolic rate. They also cannot fully represent muscle mass, illness, hormonal changes, pregnancy, medication, or adaptive changes.
Do not use this estimate to replace medical advice or to create an aggressive diet. Seek a qualified professional when nutrition, eating disorders, pregnancy, chronic disease, or unexplained weight change is involved.
BMR means basal metabolic rate, an estimate of energy used for essential resting functions.
No. Total daily energy expenditure includes activity and other energy costs beyond resting metabolism.
Many calculators use Mifflin-St Jeor or another published predictive equation; check the calculator notes.
Yes. Weight, body composition, age, health, and adaptation can affect an estimate.
No. They are population-based estimates and may differ from laboratory measurements.
Do not set an aggressive target from BMR alone; consider professional guidance and total needs.
Use the supported unit system and ensure every input uses matching units.
No. A calculator cannot diagnose a medical condition or replace clinical testing.
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