Does ideal weight calculation different for men and women?

Yes, the traditional Ideal Weight calculation is a rule of thumb rather than based on health research or study of population averages.

Older equations for Ideal Weight

Ideal body weight for women in kilograms = 49kg + 1.7 kg for each inch over 5 feet
Ideal body weight for men in kilograms = 52kg + 1.9kg for each inch over 5 feet
The above equations were developed for use by doctors to calculate drug dosages. Overestimate ideal Weight at shorter heights and underestimate it at taller heights. The body mass index is 21 for women and 22.5 for men, near the middle of the healthy BMI range. The healthy BMI range is the same for men and women so the results may apply to both. The healthy normal weight range is a BMI between 18.5 and 24.9. a body mass index of 22 is in the middle of that range.

Updated equations for Ideal Weight

Weight in Pounds = 5 x BMI + (BMI divided by 5) x (Height in inches minus 60)
Weight in Kilograms = 2.2 x BMI + (3.5 x BMI) x (Height in meters minus 1.5)
The differences between the older and newer equations come in the taller height range. The new equation allows a few pounds more at each height for women than the older charts.

What do you mean by Ideal weight calculator?

Ideal Weight Calculator estimates your body's ideal Weight based on age and height. This IBW was introduced to determine dosages for medical use, and some formulas are used to calculate it based on a person looking at a given weight. It will not give you an exact measurement which won't consider the percentages of body fat and muscle in a person's body.