Mite Count Log & Efficacy Calculator
Calculate your varroa treatment efficacy by entering pre-treatment and post-treatment mite counts. This calculator computes the percentage reduction and assigns an A/B/C/D grade so you can objectively evaluate what treatments are working in your yards. The efficacy formula is (pre - post) / max(pre, 1).
Enter Your Mite Counts
Mites per 300 bees (before treatment)
Mites per 300 bees (after treatment)
Use This Inside VarroaVault
Get the full protocol-driven experience: automated scheduling, outcome tracking, efficacy scoring, and yard-level reports.
Frequently Asked Questions
Efficacy is calculated as (pre-treatment count minus post-treatment count) divided by the pre-treatment count. For example, if your pre-count was 10 mites per 300 bees and your post-count was 2, the efficacy would be (10-2)/10 = 80%. This gives you the percentage reduction in mite load.
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Disclaimer: This tool provides informational planning support only. It is not veterinary or professional pest management advice. Always follow product label directions. Consult with your local beekeeping extension, apiary inspector, or veterinarian for treatment decisions. Mite thresholds and treatment efficacy vary by region, season, and colony condition.