What is an Age to Weight Calculator?
An age to weight calculator — also called an ideal weight by age calculator or weight calculator for age — helps you find your healthy weight range based on your height, age and gender. Unlike a simple BMI calculator, this tool uses four established formulas (Hamwi, Devine, Robinson and Miller) and shows them next to the healthy BMI weight range for your height. Your age doesn't change the formulas — but the calculator tells you if the adult formulas don't apply (under 18) or if your doctor may accept a slightly higher weight (over 65).
This free ideal weight calculator by age and height is useful for anyone wondering "what should I weigh at my age?" — whether you're 20, 35, 45 or 60. These formulas were originally created for clinical uses such as medication dosing, so treat the result as a rough target to discuss with your doctor, not a strict rule.
Ideal Weight by Height — Reference Table (Men & Women)
This height and weight chart shows the range given by the Hamwi, Devine, Robinson and Miller formulas (medium frame), next to the healthy weight range from the Indian BMI cut-off of 18.5–22.9. Use the calculator above for your exact height.
| Height | Women — formula range | Men — formula range | Healthy BMI range (all adults) |
|---|
| 150 cm | 45–53 kg | 48–56 kg | 41.6–51.5 kg |
| 155 cm | 48–54 kg | 51–58 kg | 44.4–55.0 kg |
| 160 cm | 52–57 kg | 56–60 kg | 47.4–58.6 kg |
| 165 cm | 57–60 kg | 61–63 kg | 50.4–62.3 kg |
| 170 cm | 61–63 kg | 65–67 kg | 53.5–66.2 kg |
| 175 cm | 64–66 kg | 69–72 kg | 56.7–70.1 kg |
| 180 cm | 67–70 kg | 72–78 kg | 59.9–74.2 kg |
| 185 cm | 71–75 kg | 74–83 kg | 63.3–78.4 kg |
Age does not change these formulas. Children and teenagers should use age-based growth charts instead, and adults over 65 should ask their doctor what weight suits them.
How to Use This Ideal Weight Calculator
1
Enter your height in centimetres.
2
Enter your age — the formulas are for adults, so you'll see a note if you are under 18 or over 65.
3
Select your gender — formulas differ significantly for males and females.
4
Select your body frame size — small, medium or large — for a more personalised result.
5
Optionally enter your current weight to see how far you are from the healthy BMI range.
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Frequently Asked Questions
What is an age to weight calculator?
People often search for an "age to weight calculator" when they want to know what they should weigh. For adults, healthy weight depends on height and sex, not age — the standard formulas don't change after 18. This calculator uses your age only to add a note if you're under 18 (use growth charts instead) or over 65 (your doctor may accept a slightly higher weight).
Does ideal weight change with age?
The formulas don't change with age. What changes is body composition: most adults lose muscle and gain fat as they get older, so staying active and strong matters more than a number on the scale. Some research suggests a slightly higher BMI may be fine in people over 65 — ask your doctor what's right for you.
What is the Hamwi formula for ideal weight?
Hamwi (1964): men 48 kg for the first 152.4 cm (5 feet) plus about 2.7 kg per extra inch; women 45.4 kg plus about 2.3 kg per extra inch. It's the original "106 lb + 6 lb per inch" rule for men and "100 lb + 5 lb per inch" for women.
What are the Devine, Robinson and Miller formulas?
All use the weight at 5 feet plus a set amount per extra inch. Devine (1974): men 50 kg + 2.3 kg/inch, women 45.5 kg + 2.3 kg/inch. Robinson (1983): men 52 kg + 1.9 kg/inch, women 49 kg + 1.7 kg/inch. Miller (1983): men 56.2 kg + 1.41 kg/inch, women 53.1 kg + 1.36 kg/inch.
Which ideal weight formula is most accurate?
None of them is "correct" for everyone — they were built from different data, and Devine was originally created for medication dosing. That's why the calculator shows the range across all four, plus the healthy BMI range, instead of a single number.
How do I know my frame size?
A quick check is to wrap your thumb and middle finger around your opposite wrist: if they overlap, you likely have a small frame; if they just touch, medium; if they don't meet, large. The calculator adjusts the formulas by about 10% down or up for small or large frames.
What is a healthy weight for a 40-year-old woman?
It depends on height, not age. For a 160 cm woman, the formulas give about 52–57 kg and the healthy BMI range (18.5–22.9) is about 47–59 kg — the same as at 25 or 55. Enter your own height above.
What is the ideal weight for a 23- or 24-year-old?
Age doesn't change the result for adults. A 170 cm man's formula range is about 65–67 kg (healthy BMI range 53.5–66.2 kg), and a 160 cm woman's is about 52–57 kg (47.4–58.6 kg). Enter your own height and gender above for your range.
What is the difference between ideal weight and average weight?
Average weight is simply what people of a certain height typically weigh — and in many countries that's above the healthy range. Ideal weight is a health-based target. This calculator gives health-based targets, not population averages.
Why is my ideal weight different from the BMI range?
The formulas give a narrow target, while the BMI range covers all healthy weights for your height. For short heights the formulas often sit near the top of the BMI range; for tall people they can sit lower. Anywhere within the healthy BMI range is generally considered healthy.
For Men & Women — How the Calculator Differs
Is this ideal weight calculator for men or women?
Both. Select your gender and the calculator switches to the male or female version of each formula. At the same height, men's formula results are usually a few kilograms higher than women's because men generally carry more muscle and bone mass.
Is the healthy BMI range the same for men and women?
Yes. The healthy BMI range — 18.5–22.9 under Indian guidelines, or 18.5–24.9 on the global WHO scale — is the same for adult men and women, so the "Healthy Range" result doesn't change with gender. Only the formula-based ideal weights differ.
How much should I weigh for my height?
Enter your height above. As a quick guide using the Indian healthy BMI range: at 155 cm about 44–55 kg, at 165 cm about 50–62 kg, and at 175 cm about 57–70 kg. The formula results give a narrower target within or near those ranges.
Ideal Weight by Height — Specific Answers
What is the ideal weight for a 150cm female?
For a 150 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 45.4–53.1 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 41.6–51.5 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 152cm female?
For a 152 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 45.4–53.1 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 42.7–52.9 kg. A small frame is roughly 10% lower and a large frame 10% higher. 152 cm is close to the average height of adult women in India.
What is the ideal weight for a 155cm female?
For a 155 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 47.7–54.5 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 44.4–55.0 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 158cm female?
For a 158 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 50.4–56.1 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 46.2–57.2 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 160cm female?
For a 160 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 52.2–57.2 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 47.4–58.6 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 162cm female?
For a 162 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 54.0–58.2 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 48.6–60.1 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 5'4 female?
5'4" is about 162.6 cm. For a 162.6 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 54.5–58.6 kg (about 120–129 lb). The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 48.9–60.5 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 165cm female (5'5)?
For a 165 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 56.7–59.8 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 50.4–62.3 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 168cm female?
For a 168 cm woman with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 59.3–61.5 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 52.2–64.6 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 160cm male?
For a 160 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 56.2–60.4 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 47.4–58.6 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 165cm male?
For a 165 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 61.4–63.2 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 50.4–62.3 kg. A small frame is roughly 10% lower and a large frame 10% higher. 165 cm is close to the average height of adult men in India.
What is the ideal weight for a 5'6 male?
5'6" is about 167.6 cm. For a 167.6 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 63.4–64.6 kg (about 140–143 lb). The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 52.0–64.3 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 170cm male?
For a 170 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 65.2–66.9 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 53.5–66.2 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 172cm male?
For a 172 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 66.7–69.1 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 54.7–67.7 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 5'8 male in kg?
5'8" is about 172.7 cm. For a 172.7 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 67.2–69.8 kg (about 148–154 lb). The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 55.2–68.3 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 174cm male?
For a 174 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 68.2–71.2 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 56.0–69.3 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 175cm male (5'9)?
For a 175 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 68.7–72.3 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 56.7–70.1 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 5'10 male in kg?
5'10" is about 177.8 cm. For a 177.8 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 70.3–75.3 kg (about 155–166 lb). The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 58.5–72.4 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 180cm male?
For a 180 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 71.5–77.7 kg. The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 59.9–74.2 kg. A small frame is roughly 10% lower and a large frame 10% higher.
What is the ideal weight for a 6 feet male?
6'0" is about 182.9 cm. For a 182.9 cm man with a medium frame, the four standard ideal-weight formulas (Hamwi, Devine, Robinson and Miller) give 73.1–80.8 kg (about 161–178 lb). The healthy BMI range for this height using the Indian cut-off (BMI 18.5–22.9) is 61.9–76.6 kg. A small frame is roughly 10% lower and a large frame 10% higher.
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