Always (100% of the time)
Most of the time
Sometimes
Rarely
Never
Known Negative (Recent Test)
Monogamous (Status Unknown)
Casual / Multiple Partners
Known Positive / High Risk Group
No active symptoms
Yes (Discharge, bumps, pain, etc.)
Recommended Actions:
Medical Disclaimer: This tool is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. The results are estimates based on general behavioral factors. Always consult a healthcare professional for accurate testing and medical advice.
Understanding STD Risk Factors
Sexually Transmitted Diseases (STDs) and Sexually Transmitted Infections (STIs) are extremely common, yet many individuals remain unaware of their status due to a lack of symptoms. This calculator helps estimate your relative risk based on behavioral patterns, protection usage, and partner history.
Key Determinants of Sexual Health Risk
Several primary factors influence the likelihood of contracting an STI. Understanding these variables is the first step toward proactive sexual health management:
Number of Partners: Statistically, the more sexual partners an individual has, the higher the probability of encountering a partner with an infection. Limiting partners or practicing serial monogamy can reduce exposure.
Barrier Protection: Consistent and correct use of condoms or dental dams significantly reduces the transmission of fluids and skin-to-skin contact, though it does not eliminate risk entirely (e.g., for Herpes or HPV).
Partner History: Engaging in sexual activity with partners whose status is unknown or who engage in high-risk behaviors increases your own risk profile significantly.
Common Symptoms to Watch For
If you selected "Yes" for symptoms in the calculator, you should seek medical attention immediately. Common indicators include:
Unusual discharge from the genitals.
Burning sensation during urination.
Bumps, blisters, or sores in the genital or anal area.
Pelvic pain or pain during intercourse.
The Importance of Regular Testing
Many STDs, such as Chlamydia and Gonorrhea, are often asymptomatic, meaning you can have them and transmit them without knowing. Regular screening is the only way to be certain of your status. The CDC recommends annual screening for sexually active adults, and more frequent testing (every 3-6 months) for those with multiple partners or higher risk factors.
Note: Early detection is key. Most bacterial STIs can be cured with antibiotics, while viral infections can be managed effectively with proper medical care.
function calculateSTDRisk() {
// Get input values
var partnersInput = document.getElementById('sexualPartners');
var protectionSelect = document.getElementById('protectionUsage');
var partnerSelect = document.getElementById('partnerRisk');
var symptomsSelect = document.getElementById('currentSymptoms');
var resultBox = document.getElementById('resultBox');
var riskLevelOutput = document.getElementById('riskLevelOutput');
var riskDescription = document.getElementById('riskDescription');
var actionList = document.getElementById('actionList');
var partners = parseFloat(partnersInput.value);
var protectionFactor = parseFloat(protectionSelect.value);
var partnerFactor = parseFloat(partnerSelect.value);
var hasSymptoms = symptomsSelect.value === 'yes';
// Validation
if (isNaN(partners) || partners < 0) {
alert("Please enter a valid number of sexual partners.");
return;
}
// Calculation Logic
// Base score starts at 0
// Each partner adds points, weighted by protection and partner risk profile
var riskScore = 0;
// If 0 partners in last 12 months, risk is generally minimal unless past dormancy
if (partners === 0) {
riskScore = 1; // Very low baseline
} else {
// Formula: (Partners * 10) * Protection Multiplier * Partner Risk Multiplier
// Example: 1 partner * 10 * 0.1 (Always condoms) * 0.5 (Known Neg) = 0.5 (Very Low)
// Example: 3 partners * 10 * 1.5 (Never condoms) * 2.0 (Casual) = 90 (High)
riskScore = (partners * 10) * protectionFactor * partnerFactor;
}
// Symptom Override
if (hasSymptoms) {
riskScore = 999; // Automatic highest urgency
}
// Determine Category
var riskCategory = "";
var riskClass = "";
var description = "";
var actions = [];
if (riskScore = 10 && riskScore < 50) {
riskCategory = "Moderate Risk";
riskClass = "risk-moderate";
description = "Your behaviors suggest a moderate exposure to potential infections. Precautionary measures are advised.";
actions = [
"Consider increasing condom usage frequency.",
"Schedule an STD screening within the next month.",
"Discuss testing history with all partners before intimacy."
];
} else {
riskCategory = "High Risk";
riskClass = "risk-high";
description = "Your inputs indicate significant exposure factors or symptoms that warrant immediate attention.";
actions = [
"Schedule a full STD panel immediately.",
"Abstain from sexual activity until results are received.",
"Notify recent partners if you test positive.",
"Consult a healthcare provider about PrEP (if applicable)."
];
}
if (hasSymptoms) {
riskCategory = "URGENT ATTENTION NEEDED";
description = "Because you indicated the presence of symptoms, you should see a doctor immediately regardless of behavioral history.";
}
// Display Results
resultBox.style.display = "block";
riskLevelOutput.innerText = riskCategory;
// Reset classes
riskLevelOutput.className = "risk-level " + riskClass;
riskDescription.innerText = description;
// Populate Action List
actionList.innerHTML = "";
for (var i = 0; i < actions.length; i++) {
var li = document.createElement("li");
li.innerText = actions[i];
actionList.appendChild(li);
}
}