HIV Risk Calculator (male)

HIV prevalence among partners (%)

E.g., 10 = 10%. For street sex workers, consider 10–25%.

I use PrEP

PrEP effectiveness is fixed at ~−90% according to studies.

Condom effectiveness (~−80%) and PrEP (~−90%) are fixed (CDC, Patel et al. 2014).

Enter the number of acts without and with a condom. The risks are fixed for infection risk to the male partner.

Vaginal (male insertive)

without condom

with condom

Anal – active (male insertive)

without condom

with condom

Anal – receptive (without ejaculation into the anus)

without condom

with condom

Anal – receptive (with ejaculation into the anus)

without condom

with condom

Oral – receptive (you receive in the mouth)

without condom

with condom

Oral – insertive (you insert into partner’s mouth)

without condom

with condom

Tip: After calculation, a shareable link is generated in the URL (after #).

Probability that you are NOT infected: –

Probability that you ARE infected: –

Risk ranking (per 1 act)

Practice	Risk without protection	Risk with chosen protection

References: CDC “Estimated per-act probability…”; Patel et al., AIDS 2014 (meta-analysis).