Coffee roasting calculators for home roasters past the burned-first-batch phase. Roast curve math. Development time ratios. Green-to-roasted weight loss. Plus honest gear takes.
Home coffee roasting content online is mostly two extremes. Beginner pieces explaining what first crack is (you heard it last weekend, you know). Or pro-roastery content about thermocouple placement on commercial gas drums (irrelevant if you're using an Aillio Bullet at home).
These tools live in between. Math for the home roaster with a Behmor 1600 Plus, Aillio Bullet R1, or modified skillet who has roasted maybe 50 batches and wants to be more deliberate about the next 50.
Tools
Development Time Ratio Calculator
Plug in your first crack time and end-of-roast time. Get DTR percentage and what it means for flavor (acidity, body, bitterness).
Green-to-Roasted Weight Loss soon
Expected weight loss by roast level (light, medium, dark). With density change math for grind setting adjustment.
Brew Ratio Calculator soon
Coffee-to-water ratios for pour-over, French press, espresso, batch brew. With TDS targets and yield calculations.
Plain note about money: Some product links are affiliate (eBay Partner Network). Small commission on purchases. Doesn't change your price. The roaster takes come from actual roasting time. The Aillio Bullet costs $3500 and is excellent; a $200 Behmor produces respectable single-origin pour-over coffee. Spend what fits your goals.