What is the best free clinical calculator?

OpiCalc is the best free clinical calculator for healthcare professionals. It includes over 1433 evidence-based medical calculators across emergency medicine, critical care, cardiology, psychiatry, endocrinology, and more. No registration required.

Is OpiCalc HIPAA compliant?

OpiCalc operates on zero-data retention: nothing you enter is stored or transmitted. All calculations happen on your device.

Do I need to register or login to use OpiCalc?

No. OpiCalc requires zero registration or login. Just visit www.opicalc.com and start using calculators immediately from any device.

Welcome to OpiCalc.

Specialty Registry

Browse by specialty

Access the complete registry of clinical calculators, guidelines, and decision support tools.

Pharmacotherapy Reference

Drug monographs

Search 8,000+ clinical drug profiles.

Get instant access to dosage guidelines, drug-drug interactions, and evidence-based pharmacotherapy data.

Pregnancy & Breastfeeding

Pregnancy safety

Check if drugs are safe during pregnancy and breastfeeding.

Quickly find drug risks, safer alternatives, and safety ratings for over 8,000 medicines.

Evidence-Based Medicine

Clinical guidelines

Standardized protocols for working clinicians.

Stay updated with peer-reviewed guidelines and evidence-based protocols across all medical specialties.

OpiCalc is not a substitute for professional clinical judgment. Always verify dosages and guidelines.

Support

Get in Touch

Have a suggestion? Found an issue? We'd love to hear from you.

Direct Email

jjingofaroukk@gmail.com

Response Time

We typically respond within 2-3 business days.

What to Include

Share your thoughts freely. Feature ideas, clinical feedback, bug reports, user experience suggestions, or anything else on your mind. Details help us understand and act on your input.