What is HIV Risk Report?

HIV Risk Report is a private HIV risk calculator and educational report tool. It estimates the statistical risk of HIV transmission from a single sexual encounter using published epidemiological data, including sources such as the CDC, UNAIDS and peer-reviewed HIV transmission studies. The calculator translates exposure details into one clear probability, shown as both a percentage and a “1 in X” figure. This report does not diagnose HIV or predict individual outcomes, but it helps replace vague anxiety with realistic context, testing-window guidance and next steps.

How does the HIV risk calculator work?

You answer confidential questions about your encounter, location, sex type, condom use, PrEP or PEP use, partner HIV status and other risk factors. The calculator maps your answers to an epidemiological framework using country-level HIV prevalence, treatment coverage and act-specific transmission probabilities. It then produces a six-page PDF report with your calculated estimate, the logic behind it and clear next steps.

Why should I trust the results from HIV Risk Report?

The model is built from peer-reviewed HIV transmission research, UNAIDS and CDC data and calibrated against global prevalence figures. The report explains how each input changes the final probability so you can see the logic rather than a black-box number. It is a decision-support tool that turns anxiety and guesswork into a structured, evidence-based estimate.

How fast will I receive my HIV risk report?

After you complete the assessment, you receive your personalised six-page PDF report in under thirty minutes. The report is delivered in an encrypted format for privacy.

Is my information private when I use the HIV Risk Report tool?

Yes. The assessment is designed to be private and anonymous. You enter information about your encounter and location so the calculator can estimate risk. The goal is to give you clarity and peace of mind without exposing your identity.

Is HIV Risk Report a replacement for a doctor or HIV test?

No. HIV Risk Report is an educational tool that helps you understand probability based on your encounter and current research. It does not diagnose HIV or replace medical advice, testing or treatment. You should speak with a healthcare professional and follow local testing guidelines if you are concerned about HIV.

HIV Risk Report

~PROPRIETARY BAYESIAN RISK MODELING ENGINE~

🕓 Model last updated: 12 August 2026

RISK_ENGINE_v6.7 - SYSTEM ONLINE

HIV Risk Report takes a different approach from conventional HIV risk calculators. Unlike basic calculators that output a generic "low/medium/high" label, our proprietary Bayesian risk modeling engine processes your encounter details through a multi-layered statistical framework, incorporating exposure-specific transmission probabilities, country-level epidemiological data, partner characteristics and biological modifiers, to produce a personalized numerical estimate expressed as both a percentage and a "1 in X" figure, delivered inside a comprehensive 6-page PDF analysis with a full calculation breakdown showing how your number was derived.

Start Your 6-Page Personalized
HIV Risk Assessment

Proprietary Bayesian analysis using encounter-specific data. Not a generic questionnaire.

WHY THIS ISN'T JUST ANOTHER HIV CALCULATOR

Most HIV risk tools ask a few questions and return a vague label. HIV Risk Report is fundamentally different. You don't just get a number. You get a 6-page personalized analysis that walks you through the entire calculation, explains what drove your result and gives you clear next steps.

Behind the report is our proprietary engine, which uses Bayesian probability modeling. Bayesian methods are widely used across medical and epidemiological research. Our engine applies this framework to calculate a personalized transmission probability for your scenario.

The model is regularly reviewed and updated as relevant new evidence becomes available. Model assumptions, epidemiological datasets and risk modifiers are regularly reviewed against the relevant published evidence. This isn't a static lookup table. It's a living statistical system.

Our methodology sits at the intersection of established HIV science and emerging AI-assisted health analysis, allowing evidence to be applied with greater context and specificity.

Bayesian Probability Framework Proprietary Logic Regularly Updated Peer-Reviewed Data Sources Multi-Factor Modeling Country-Level Epidemiology AI-Assisted Analysis

How the Engine Processes Your Data

Your inputs flow through a multi-stage Bayesian pipeline. Each stage updates the probability based on a new piece of evidence.

Step 1 Your Encounter Details Exposure type, role, location, partner context

Step 2 Bayesian Engine Processes Prior probability, evidence updates, multi-factor modeling

Step 3 6-Page Analysis Delivered Percentage, 1-in-X, full breakdown, next steps

Partner Probability x Per-Act Rate x ART Cascade x Modifiers = Your Estimate

Inside the Bayesian Risk Engine

The system processes your encounter through multiple statistical layers. Each factor is a node in the calculation pipeline.

Exposure Type

Anal, vaginal and oral exposure each carry different baseline transmission probabilities, further split by insertive vs. receptive role.

Partner Probability

Country-level prevalence, partner demographics and risk indicators construct the Bayesian prior for the encounter.

ART Cascade

Treatment coverage and viral suppression rates are modeled using country-specific data to filter transmission probability.

Protective Measures

Condom use and PrEP are applied as risk-reducing multipliers derived from clinical trial data.

Biological Modifiers

Ejaculation, mucosal integrity, circumcision status and inflammation, each calibrated against peer-reviewed evidence.

Country Epidemiology

Country-specific HIV prevalence and treatment data contextualize your estimate within the relevant epidemic profile.

Why Trust the Results?

Built on rigorous statistical methodology and peer-reviewed data.

Bayesian Statistical Framework

The same class of probabilistic reasoning used in clinical diagnostics, applied to HIV transmission modeling with encounter-specific detail.

Regularly Updated Model

Risk multipliers and data sources are regularly cross-referenced against new peer-reviewed publications. This is a living system, not a static tool.

Full Calculation Transparency

See how your number was derived. Every factor, every multiplier, every step. View our Risk Engine methodology.

Encounter-Specific Detail

No two estimates are the same. Your result reflects the unique combination of factors present in your specific scenario.

Standard HIV Calculators vs. HIV Risk Report

HIV Risk Report takes a different approach from conventional HIV risk calculators. Here's the difference between a basic questionnaire and a state-of-the-art Bayesian modeling system.

Standard Calculators

Return vague labels: "low", "medium", "high"
Use static lookup tables with no nuance
Ignore country-level epidemiological context
Don't account for partner treatment status
No calculation transparency, just black box output
One-size-fits-all approach

HIV Risk Report (Bayesian Engine)

Returns a personalized percentage and 1-in-X estimate
Proprietary Bayesian model with multi-factor analysis
Full 6-page PDF report, not just a single number
Incorporates country-specific prevalence and treatment data
Accounts for ART, viral suppression and partner risk factors
Full step-by-step calculation breakdown in your report
Regularly reviewed and updated against peer-reviewed literature
Every estimate is unique to your specific encounter

Calculate Your Personalized
HIV Risk

Proprietary Bayesian analysis. 6-page personalized report. Full calculation transparency.

HIV Risk Calculator Resources

Learn more about how our Bayesian engine works, what factors influence HIV transmission probability and how to interpret your results.

HIV Risk Calculator GuideThe complete guide to HIV exposure risk, transmission probability and how our Bayesian estimates should be interpreted. Risk Engine MethodologySee how the proprietary Bayesian framework constructs prior probabilities, applies encounter-specific modifiers and derives the final estimate. FAQAnswers to common questions about the Bayesian model, what your results mean, testing timelines and what to do next.

Latest Risk Engine Update

The Bayesian model is regularly reviewed and refined as new evidence, methodology improvements and report functionality evolve.

VERSION 6.7

Evidence Audit of Risk Multipliers: All risk multipliers in the Bayesian framework were cross-referenced against the supporting peer-reviewed evidence used by the model.
Wound and Inflammation Adjustment: The applicable modifier was fine-tuned to better reflect published meta-analytic evidence.
Circumcision Factor Update: Circumcision logic was harmonized across relevant exposure pathways where the same biological mechanism applies.
On-Demand PrEP Calibration: The protection assumption for on-demand PrEP was adjusted to more closely reflect the IPERGAY evidence used by the model.
Multiple Partner Factor: The applicable partner-risk modifier was recalibrated against supporting epidemiological literature.
Intravenous Drug Use Logic: Partner-risk handling was reorganized within the formula to improve mathematical clarity and transparency.
Expanded Source Citations: Additional peer-reviewed sources were added directly to the report reference section.

View the full Risk Engine methodology and calculation logic

Start Your Personalized HIV Risk Assessment

WHAT ARE YOUR ESTIMATED HIV ODDS?