Overweight Calculator
Adjust the inputs below. Results update as you type.
How it works
BMI 25–29.9 is classified as overweight; 30+ as obese. To reach BMI 24.9 (top of normal range): target weight = 24.9 × height(m)². Weight loss needed = current weight − target weight. Losing 1–2 lb/week via a 500–1000 kcal/day deficit is evidence-based. Waist circumference provides additional cardiovascular risk information beyond BMI.
Input guidance
- Use measured values (recent weight, height, activity level) rather than guesses.
- Recalculate every few weeks as your routine and body metrics change.
- Pair screening metrics with context such as sleep, stress, and medical history.
The formula
Overweight is defined by BMI 25–29.9 (weight kg ÷ height m²). Obesity begins at 30. The calculator compares your BMI to these thresholds.
Worked example
Someone 1.75 m tall weighing 85 kg has BMI = 85 ÷ 1.75² = 27.8, which falls in the overweight range.
More examples to test
- Maintenance case: keep activity constant and observe expected baseline ranges.
- Adjustment case: change only one major variable to understand sensitivity.
How to interpret results
Use results for awareness and planning, then validate with qualified medical or nutrition professionals for individualized decisions.
When this can be inaccurate
Population formulas cannot account for all biological factors such as medical conditions, medication effects, body composition differences, and genetics.
Change history
- July 2026: Quality-reviewed for publication with formula checks and explanatory copy updates.
Site-wide corrections also appear on the corrections log.
Track fitness goals with a top app
General wellness resource.
Frequently asked questions
What BMI is overweight?+
A BMI of 25 to 29.9 is classified as overweight, and 30 or above as obese, for most adults.
Does overweight always mean unhealthy?+
Not necessarily. BMI ignores muscle and fat distribution. Waist size, fitness, and lab markers give a fuller health picture.
How much should I lose?+
Even a 5–10% weight reduction can meaningfully improve health markers. A provider can help set a realistic, sustainable target.
Can this calculator diagnose a condition?+
No. It is a screening and education tool only, not a clinical diagnosis.
When should I seek professional advice?+
Seek professional advice when results are extreme, persistent, or conflict with symptoms, goals, or prior medical guidance.