Free Online Calculators & Utilities – Age, Date, BMI, Calories, Body Shape

Free, instant calculators that run in your browser — nothing you enter is stored or sent anywhere. Dates and ages, body measurements and daily calories: the numbers models, casting teams and everyone else reach for most often.

Age CalculatorExact age in years, months and days — today or on any date.Date CalculatorDays between two dates, or add and subtract days, weeks, months and years.Date of Birth CalculatorFind a date of birth from an age on a given date.BMI CalculatorBody mass index with WHO and Indian categories and a healthy weight range.BMR CalculatorBasal metabolic rate by Mifflin-St Jeor, Harris-Benedict and Katch-McArdle.Calorie CalculatorDaily calories to maintain, lose or gain weight from your BMR and activity.Height Weight CalculatorIdeal weight for your height by four formulas plus the healthy BMI range.Body Shape CalculatorHourglass, pear, apple, rectangle or inverted triangle from bust, waist and hips.Bra Size CalculatorBand and cup size in UK, US and EU sizing from two measurements, with sister sizes.

Dates and ages

The age calculator gives exact age in years, months and days on any date; the date of birth calculator works the other way, from an age back to a birthday; and the date calculator counts days between dates or adds and subtracts days, weeks, months and years — useful for shoot dates, usage periods and deadlines.

Body and measurements

The BMI calculator and height weight calculator show where a weight sits for a height under both WHO and Indian guidelines. The body shape calculator reads hourglass, pear, apple, rectangle or inverted triangle from bust-waist-hip figures, and the bra size calculator converts two measurements into UK, US and EU sizes.

Energy and nutrition

The BMR calculator estimates the calories your body burns at rest with three standard formulas; the calorie calculator turns that into daily targets to maintain, lose or gain weight at a safe pace.

Health calculators here give general information from population formulas and are not medical advice. More utilities are added over time — if there is one you need, tell the desk.

Frequently asked questions

Are the ZJELL Models utilities free?

Yes. Every calculator is free, needs no sign-up and runs entirely in your browser.

Is my data stored?

No. Nothing you type into a calculator is sent to ZJELL Models or any third party.

Which units can I use?

Metric is the default (cm, kg, DD-MM-YYYY dates). The body and health calculators also accept feet, inches and pounds.

Why does a model portfolio site have calculators?

Models, casting teams and clients use these numbers daily — age on a shoot date, bust-waist-hip, BMI and ideal weight ranges. Publishing accurate tools in one place saves everyone time.

Can I suggest a calculator?

Yes — message the desk through the contact page with what you need and how you would use it.

Are you a model? Create your free portfolio on ZJELL Models. Looking for models for a shoot? Browse portfolios or send a booking request.