Instant Utilities
Clinical precision, instant answers.
This free Age Calculator gives you your precise age down to the exact day, along with fun life stats, your next birthday countdown, Western and Chinese zodiac signs, and the ability to compare your age with up to 3 family members or friends. It is the most complete age calculator you will find — and it is completely free.
This free BMI Calculator gives you your Body Mass Index instantly along with your healthy weight range, resting metabolism (BMR), personalised health tips and the ability to compare your BMI with up to 3 family members or friends. Supports both Metric (kg, cm) and Imperial (lbs, ft/in) units
Privacy First — Your data stays on your device. Nothing is uploaded, nothing is stored, no servers involved. Just instant results, right in your browser.
Check Your BMI, Age & Compare with Family Instantly — Free
Knowing your body weight status and understanding your exact age are two of the most basic yet important personal health metrics. CalcTool brings you two completely free health tools on one page — a BMI Calculator and an Age Calculator — both giving instant results with no login required.
BMI Calculator
BMI stands for Body Mass Index — a simple numerical measure calculated from your height and weight that indicates whether you are in a healthy weight range for your size. Our BMI Calculator supports both Metric (kg and cm) and Imperial (lbs and ft/in) units and gives you far more than just a number.
Enter your weight, height, age and biological sex — and instantly see your BMI score, which category it falls in, your personal healthy weight range, your Basal Metabolic Rate (BMR) showing how many calories your body burns at rest, and personalised health tips based on your result.
Compare BMI with Family and Friends
One of the most useful features of our BMI Calculator is the family comparison tool. Toggle the Compare switch and add up to three more people — enter their name, relation, age, biological sex, weight and height — and see everyone's BMI, healthy weight range and BMR side by side on one screen. Each person gets their own colour-coded result card showing their BMI category and how it compares to yours.
This is perfect for families tracking health together, parents monitoring their children's weight status, couples comparing health metrics, or friends holding each other accountable on fitness goals. Because the calculator uses sex and age in the BMR formula, every result is accurate and personalised for each individual — not a generic one-size-fits-all number.
Age Calculator
Our Age Calculator tells you your exact age in years, months, days, hours, minutes and total weeks — not just your birth year. It also shows your next birthday countdown, fun life stats like total heartbeats and meals eaten, and your Western zodiac, Chinese zodiac and Vedic Rashi based on your date of birth.
Compare Age with Family and Friends
Just like the BMI tool, the Age Calculator includes a family comparison feature. Add up to three people with their names, relations and dates of birth — and instantly see each person's exact age alongside yours. The tool automatically calculates the precise age difference between each person and you in years, months and exact days. It even shows a special message when two people are born within 30 days of each other.
This feature is loved by siblings curious about their exact age gap, parents comparing their children's ages, and couples who want to know the precise difference between them down to the day.
All tools are completely free with instant results and no signup required.