"I recalculate my macros every time I adjust my training cycle. The calorie calculator uses Mifflin-St Jeor which my nutritionist confirmed is the most accurate formula. And my body stats stay on my phone — not in some fitness company's database."

Ryan O.

Amateur Powerlifter

"The 1RM calculator is spot on. I test it against my actual maxes every few weeks and it's always within 5 pounds. Quick, no ads covering the screen, and I don't need to download another fitness app that wants access to my contacts."

Amara T.

Strength Coach

"I used the pregnancy due date calculator every week during my first trimester. It was reassuring to have something simple that didn't ask me to create a profile or subscribe to weekly emails I didn't want. Just the date. That's all I needed."

Emily S.

First-Time Mom

Free health calculators for BMI, calorie needs, BAC estimation, sleep cycles, and pregnancy planning. All tools run in your browser — your health data stays on your device.

Frequently Asked Questions

What health calculators are available?

BMI calculator, calorie calculator (Mifflin-St Jeor), BAC calculator, sleep cycle calculator, calorie deficit calculator, pregnancy due date calculator, and pet age calculator.

Are these tools medically accurate?

They use validated formulas (Mifflin-St Jeor for calories, standard BAC formulas) but provide population-average estimates. They are not substitutes for medical advice.

Is my health data private?

Yes. Every calculation runs locally in your browser. Your age, weight, height, and other health inputs are never sent to a server.

Should I use these tools for medical decisions?

No — use them for general wellness awareness and planning. Always consult a licensed healthcare provider for medical decisions.