Coffee is one of the most precisely tuneable beverages in the world. The same bag of beans can produce a watery disappointment or a complex, balanced cup depending on your grind size, water temperature, brew ratio, and technique. This calculator takes the guesswork out by applying the science of extraction and caffeine metabolism to your specific inputs.
The Science of Coffee Extraction
Caffeine summary and chart use the same instant-dose exponential estimate: remaining = dose × 0.5^(elapsed hours / selected adjusted half-life). Doses contribute only at or after ingestion; the timeline continues into the next day. The 0–100 caffeine exposure score is an unvalidated heuristic, not measured or predicted clinical sleep efficiency. A residual-mg threshold or cutoff cannot guarantee undisturbed sleep. Espresso ratios describe finished beverage mass: 28.349523125 g coffee at 1:2 targets 56.69904625 g beverage, with no grounds-retention subtraction. Optional volume assumes 1 g/mL and caffeine uses the disclosed serving size. Home cost includes beans, electricity, a $0.06 paper filter for pour-over/Chemex/drip, and any milk; monthly cost uses 30.4368 days.
Brew Ratios: Finding Your Balance
Caffeine summary and chart use the same instant-dose exponential estimate: remaining = dose × 0.5^(elapsed hours / selected adjusted half-life). Doses contribute only at or after ingestion; the timeline continues into the next day. The 0–100 caffeine exposure score is an unvalidated heuristic, not measured or predicted clinical sleep efficiency. A residual-mg threshold or cutoff cannot guarantee undisturbed sleep. Espresso ratios describe finished beverage mass: 28.349523125 g coffee at 1:2 targets 56.69904625 g beverage, with no grounds-retention subtraction. Optional volume assumes 1 g/mL and caffeine uses the disclosed serving size. Home cost includes beans, electricity, a $0.06 paper filter for pour-over/Chemex/drip, and any milk; monthly cost uses 30.4368 days.
Caffeine Pharmacology: How Your Body Processes Coffee
Caffeine summary and chart use the same instant-dose exponential estimate: remaining = dose × 0.5^(elapsed hours / selected adjusted half-life). Doses contribute only at or after ingestion; the timeline continues into the next day. The 0–100 caffeine exposure score is an unvalidated heuristic, not measured or predicted clinical sleep efficiency. A residual-mg threshold or cutoff cannot guarantee undisturbed sleep. Espresso ratios describe finished beverage mass: 28.349523125 g coffee at 1:2 targets 56.69904625 g beverage, with no grounds-retention subtraction. Optional volume assumes 1 g/mL and caffeine uses the disclosed serving size. Home cost includes beans, electricity, a $0.06 paper filter for pour-over/Chemex/drip, and any milk; monthly cost uses 30.4368 days.
The Economics of Home Brewing
The financial case for brewing at home is compelling. Specialty whole-bean coffee from a quality roaster typically costs $15–$25 per 12-ounce bag, which yields about 17–20 cups at a standard brew ratio — roughly $0.75 to $1.50 per cup. A café latte or cappuccino in a major city averages $5–$7. If you buy two coffees per day, switching to home brewing saves $2,600 to $4,700 per year. Even accounting for equipment — a decent burr grinder runs $100–$200 and a pour-over or French press costs $20–$50 — the payback period is measured in weeks, not years. Automatic drip machines with built-in grinders start around $150 and last a decade. Pod-based machines look convenient and inexpensive upfront, but the per-cup cost of pods ($0.50 to $1.50 each) approaches café prices and the cups are far less customizable. For anyone drinking coffee daily, a scale, a burr grinder, and a simple manual brewer is the highest-return kitchen investment you can make.
Dialing In Your Personal Workflow
Caffeine summary and chart use the same instant-dose exponential estimate: remaining = dose × 0.5^(elapsed hours / selected adjusted half-life). Doses contribute only at or after ingestion; the timeline continues into the next day. The 0–100 caffeine exposure score is an unvalidated heuristic, not measured or predicted clinical sleep efficiency. A residual-mg threshold or cutoff cannot guarantee undisturbed sleep. Espresso ratios describe finished beverage mass: 28.349523125 g coffee at 1:2 targets 56.69904625 g beverage, with no grounds-retention subtraction. Optional volume assumes 1 g/mL and caffeine uses the disclosed serving size. Home cost includes beans, electricity, a $0.06 paper filter for pour-over/Chemex/drip, and any milk; monthly cost uses 30.4368 days.