I'm pretty sure it doesn't say on the packaging. I checked it thoroughly myself! Probably 20-25 that's what most of them are.....I think! I myself found Discover to be better than Confirm, and I am a POAS addict! Still testing twice a week, just to check that everything is ticking along. Fortel Ultra is good for early testing, but I found I only ever got a faint line, even after af was due. GL, sing out if you need any more info!