Fun fact
On 11 November 1842, the feast of St. Martin, the citizens of Plzeň in Bohemia tasted a beer nobody had ever drunk before. The city's new brewery had hired Joseph Groll, a Bavarian brewer, to make a bottom-fermented lager using the town's remarkably soft water — and he spiced it with fine, delicate Saaz hops (Žatecký poloraný červeňák), grown nearby for centuries. The result was the world's first pale lager, golden and brilliantly clear, today sold as Pilsner Urquell. The style was copied so widely that “pilsner” became a generic name for beer far beyond Bohemia. Saaz remains one of the original “noble” hops, prized for its spicy, herbal aroma rather than raw bitterness — proof that in brewing, terroir matters as much as technique.
Tool usage guide
- Pick a mode. Use the IBU Calculator for one addition, or the Multi-Addition Builder for a full hop bill with several timings.
- Enter your batch. Type in hop amount, alpha-acid percentage, batch volume, original gravity and boil time.
- Check the estimate. The Tinseth formula returns your IBU instantly; compare it with the target range for your style.
- Plan the aroma. Switch to the Dry Hopping tab, enter the rate in g/L, contact time and temperature.
- Brew with confidence. Write the numbers into your recipe and repeat after every tweak until the bitterness fits.