BMI calculator
Calculate your BMI online using height and weight. Get body mass index results with metric and imperial units.
Free web browser tools
Health
Use standard formulas to produce general health estimates. These tools are informational and do not replace professional medical advice.
Calorie calculator
Estimate daily calorie needs based on age, height, weight, activity level, and goals.
Due date / pregnancy calculator
Estimate a pregnancy due date from the first day of your last menstrual period and see the estimated current gestational age. Uses the standard 280-day calculation.
Health FAQs
How are tags used on ReallyUseful.Tools?
Tags group tools by shared traits such as file converter, in browser, or privacy friendly so you can filter the directory by feature.