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Ideal Weight Calculator

Use this ideal weight calculator to estimate a BMI-based adult weight range from US or metric height and compare it with current BMI.

Last reviewed June 6, 2026Source note includedPlanning estimateNo expert review claimed

Live calculator

Ideal weight range

BMI-based weight range129 - 174 lb

Approximate adult BMI 18.5 to 24.9 range for this height.

Range midpoint151 lb

A simple midpoint for comparison, not a medical target.

Current BMI25.8

Calculated from 70 in / 177.8 cm and current weight.

Use this as a planning estimate, not medical advice. Medical conditions, medication, pregnancy, eating disorder history, or disease-specific nutrition needs should be handled with a qualified professional.

Quick answer

Ideal Weight Calculator: what it calculates

Ideal Weight Calculator calculates BMI-based weight range from height, current weight, and unit system. The visible formula is Weight in kg = BMI x height in meters^2; US equivalent = BMI x height in inches^2 / 703.

ResultBMI-based weight range
InputsHeight, Current weight, Unit system
FormulaBMI weight range formula

Formula

BMI weight range formula

Weight in kg = BMI x height in meters^2; US equivalent = BMI x height in inches^2 / 703

This calculator supports pounds with feet/inches or kilograms with centimeters, using adult BMI 18.5 to 24.9 as a broad screening range.

How to use

Steps

  1. Choose pounds with feet/inches or kilograms with centimeters.
  2. Enter height.
  3. Optionally enter current weight for a BMI comparison.
  4. Review the BMI-based adult weight range.
  5. Use the result as a broad screening reference, not a diagnosis.

Example

Sample calculation

Height5 ft 10 in / 177.8 cm
BMI range18.5 - 24.9
Weight range129 - 174 lb / 58.5 - 78.7 kg

Calculator use

Best for

  • Use this ideal weight calculator to estimate a BMI-based adult weight range from US or metric height and compare it with current BMI.
  • Estimating body, hydration, protein, calorie, macro, or fitness planning numbers with assumptions visible.
  • Comparing rough scenarios before tracking trends or discussing the result with a qualified professional.
  • Keeping formula inputs visible so the number can be checked later instead of treated as a diagnosis.

Before relying on it

Check first

  • Treating a screening or planning estimate as medical, nutrition, eating-disorder, pregnancy, or disease-specific advice.
  • Ignoring age, sex, medication, body composition, training status, medical history, heat, illness, or measurement method.
  • Changing diet, hydration, or training aggressively from one calculator result without appropriate context.

Details

What to know before using the result

These notes make the assumptions explicit, especially where the same search query can mean slightly different things.

Adult scopeAdults 20 and older

Adult BMI ranges are not interpreted the same way for children and teens, who use age and sex percentiles.

Estimate typeBMI-based range

The result is based on height, BMI, and unit conversions only. It does not account for muscle mass, pregnancy, medical history, or body composition.

Personal targetNot one exact weight

A healthy weight is usually a range. A qualified clinician can help interpret it in context.

Source notes

References used for this calculator

Centers for Disease Control and PreventionLists adult BMI categories and states that BMI is a screening measure, not intended to diagnose disease or illness.Centers for Disease Control and PreventionExplains that BMI should serve as an initial screening measure for adults.National Institute of Standards and TechnologyPublishes common inch, centimeter, pound, and kilogram conversion factors used for unit switching.

Benchmarks

How to read the result

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions. Benchmark ranges are broad planning heuristics unless this page names a specific source for the range.

18.5 - 24.9 BMI: Adult healthy range.

Common adult screening range used for the weight estimate.

25 - 29.9 BMI: Overweight range.

BMI can be misleading when body composition is unusual.

30+ BMI: Obesity range.

Worth reviewing with health context rather than using BMI alone.

Calculator accuracy

Methodology and assumptions

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

Formula

Weight in kg = BMI x height in meters^2; US equivalent = BMI x height in inches^2 / 703

Inputs used

Height, Current weight, Unit system

Limitations

Health results are screening or planning estimates. Age, body composition, medication, medical history, pregnancy, and professional guidance can change the right interpretation.

Last reviewed

June 6, 2026

Cite this page

Toolkit Shelf. Ideal Weight Calculator. Last reviewed June 6, 2026. https://toolkitshelf.com/tools/ideal-weight-calculator

FAQ

Common questions

How is ideal weight calculated?

This calculator converts the adult BMI 18.5 to 24.9 range into a weight range for the height entered, using metric BMI math or the equivalent US formula.

Is this my exact ideal weight?

No. It is a BMI-based screening range, not a personalized target or medical diagnosis.

Why is the result a range?

BMI categories cover ranges, and healthy weight can vary with body composition, age, pregnancy, and medical context.

When should I ask a clinician?

Ask a clinician or qualified nutrition professional when pregnancy, medication, medical history, eating disorder risk, symptoms, or disease-specific guidance matters.

Why can health formulas be misleading?

Health formulas simplify age, sex, body composition, training status, measurement method, pregnancy, and medical context into a planning estimate.

Is this medical advice?

No. Health calculators are screening or planning tools and do not diagnose, treat, or replace professional medical or nutrition guidance.