28 free, working calculators for BMI, calories, pregnancy, and more — every result comes with a plain-language explanation.
Tap any card — it opens straight to a working calculator.
7 categories, 28 calculators total.
Every calculator shows its formula and a worked example, not just a black-box number.
Results come with context on what they mean and how to act on them.
A clean, distraction-free design that works well on any device.
28 free tools. Filter by category or tap one to open it.
Tap a category to see and open every calculator inside it.
Common questions about Sweet Calculator and how to use it.
Every calculator uses published formulas, but results are estimates. They're meant to inform, not replace, advice from a qualified doctor or dietitian.
Yes. Every calculator on the site is free, with no account required.
Metric keeps every formula consistent and easy to verify. If you use imperial units, convert with: kg = lb ÷ 2.205, and cm = in × 2.54.
For most adults, 18.5 to 24.9 is considered healthy by the CDC and WHO. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obesity.
Formulas are checked periodically against current guidance from bodies like the CDC, WHO, NIH, and IOM.
Why we built this, and what we're trying to do differently.
Sweet Calculator was built on a simple idea: health calculators should show their work. Most calculator sites give you a number and nothing else — no formula, no explanation, no context for whether it even applies to you.
Every tool on this site pairs its calculation with a plain-language explanation and an honest discussion of its limitations. We'd rather you understand your result than just stare at it.
We are not a medical provider. Every calculator here produces an estimate for educational purposes, and nothing on this site should replace advice from a qualified doctor, dietitian, or healthcare professional.
Have a suggestion or spotted something inaccurate? Send us a review — it goes straight to our inbox.