The Ideal Weight Calculator is a free tool that helps you calculate ideal weight using the formula Robinson formula plus a BMI 18.5-24.9 healthy range. Enter your values above and press Calculate to get ideal weight (robinson), healthy range low, healthy range high instantly, with a full step-by-step breakdown.
What is the Ideal Weight Calculator?
The ideal weight calculator is a free online tool that helps you calculate ideal weight quickly and accurately. It applies the standard formula Robinson formula plus a BMI 18.5-24.9 healthy range to the values you enter and, when you press Calculate, displays the result together with a clear, step-by-step explanation of how the answer was reached.
Also known as: height weight calculator, height and weight calculator, ideal body weight calculator, weight according to height and age in kg, ideal body weight, ideal weight for height.
How to use the Ideal Weight Calculator
- Choose gender.
- Enter your height.
- See ideal weight and a healthy range.
Formula used
The ideal weight calculator is based on this formula:
Robinson formula plus a BMI 18.5-24.9 healthy rangeEach term in the formula corresponds to one of the inputs explained below. The calculator performs the arithmetic for you and shows every step so you can check the working by hand if you wish.
Worked example
Suppose you enter Male, 170cm. The calculator works as follows:
| Inputs | Male, 170cm |
|---|---|
| Working | Robinson + BMI range |
| Result | Ideal about 65 kg; range 53-72 kg |
Step-by-step calculation
- Apply the formula:
Robinson formula plus a BMI 18.5-24.9 healthy range - Substitute your values: Robinson + BMI range
- Read the result: Ideal about 65 kg; range 53-72 kg
Inputs explained
- Gender — the gender used in the calculation.
- Height (cm) — the height used in the calculation.
Understanding your result
- Ideal weight (Robinson) — the calculated ideal weight (robinson) in kg.
- Healthy range low — the calculated healthy range low in kg.
- Healthy range high — the calculated healthy range high in kg.
Benefits and practical uses
The ideal weight calculator saves time and removes the risk of manual errors when you need to calculate ideal weight. It is useful for students, professionals and anyone who wants a fast, dependable answer. Results update the moment you press Calculate, work on any device, and can be copied or shared in a single click — and because the maths runs in your browser, your figures stay completely private.
Tips for an accurate result
- Keep all related inputs in the same units.
- Use the worked example above to confirm you are entering values in the right places.
- Review the assumptions below so the result fits your situation.
- Press Reset to clear everything and try a different scenario.
Common mistakes to avoid
- Entering values in the wrong unit (mismatched units give wrong answers).
- Leaving a required field empty — the calculator will ask you to fill it in.
- Treating the result as a diagnosis instead of a general guide.
Assumptions and limitations
- Robinson (1983) formula.
- Adults only.
Frequently asked questions
Is there one ideal weight?
No. Formulas give estimates; a healthy range based on BMI is more realistic.
How do I use the Ideal Weight Calculator?
Enter your values in the fields, then press the Calculate button to see the result. Use Reset to clear the form and start again. Nothing is calculated until you click Calculate.
What formula does the Ideal Weight Calculator use?
It uses the standard formula: Robinson formula plus a BMI 18.5-24.9 healthy range. The full step-by-step working is shown with every result so you can verify it.
What information do I need to use the ideal weight calculator?
You need: gender, height. Sensible example values are pre-filled so you can see how it works.
Is the Ideal Weight Calculator free to use?
Yes. Every DigiToolkit calculator is completely free, with no sign-up, no login and no usage limits.
Does the Ideal Weight Calculator work on mobile phones?
Yes. The calculator is mobile-first and works on phones, tablets and computers in any modern browser.
Do I need to install an app?
No. The ideal weight calculator runs directly in your web browser — there is nothing to download or install.
Is my data private when I use this calculator?
Yes. All calculations run inside your browser. The numbers you enter are never uploaded to a server or shared with anyone.
How accurate is the Ideal Weight Calculator?
It uses the generally accepted formula for ideal weight and computes to several decimal places. Results are accurate for the assumptions listed on this page.
Can I copy or share my result?
Yes. After calculating, use the Copy button to copy the result, or Share to copy the page link.
Why is nothing showing until I press Calculate?
By design, the calculator only computes when you press Calculate, so you can finish entering all your values first. Press Reset any time to clear everything.
What units does the Ideal Weight Calculator use?
It works with cm. Keep your inputs in consistent units for an accurate result.