What is HIV risk calculator? and references

 This is the second version 2.0 of HIV transmission risk estimator tool after sexual exposure. It is based on several medical guidelines that are mentioned below. It was developed initially by Dr.Almunther Alhasawi, a consultant in infectious diseases and genitourinary urinary medicine and later it became widely available and translated to many languages. Want to read more?

This calculator include the following data:  HIV risk per exposure based on meta-analysis, protective efficacy of condom and PREP (Truvada) , STD increasing risk of HIV range by folds, HIV status, anti-retroviral therapy intake and HIV viral load

All rights reserved© for The calculator should not considered a substitute of in-person doctor visit. You agree that the information and calculations presented by this tool are for educational purposes, thereby, we do not assume any responsibility for the consistency of this information with the opinion or diagnosis of health providers.


 1- BASHH and BHIVA, UK Guideline for the use of HIV Post-Exposure Prophylaxis 2021,

2- CDC, HIV Risk Behaviors,

3- Patel P. Et al. Estimating per-act HIV transmission risk: a systematic review. AIDS. 2014.

4- Ward H, Rönn M. Contribution of sexually transmitted infections to the sexual transmission of HIV. Curr Opin HIV AIDS. 2010;5(4):305-310.

5- Underhill, K. Et al (2016). Explaining the Efficacy of Pre-exposure Prophylaxis (PrEP) for HIV Prevention: A Qualitative Study of Message Framing and Messaging Preferences Among US Men Who have Sex with Men. AIDS and behavior, 20(7) 

.Last update was on October 2021

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