Enter your concentrate strength and the strength you want to drink at — we'll do the dilution maths.
Cold brew is typically made at a concentrated ratio (e.g. 1:5 coffee to water) and diluted to drinking strength before serving. If your concentrate is 1 : C and you want to drink at 1 : T, you need to add (T − C) parts of water per part of concentrate. The tool converts this to millilitres for the volume of concentrate you have on hand.
1:5 to 1:8 by weight is standard. Stronger concentrates are more efficient to store; weaker ones require less dilution.
Yes — the math is the same by volume. Expect a creamier, less "coffee-forward" drink.
Bitterness often comes from over-extraction during steeping. Try a coarser grind or a shorter steep next time, then dilute as normal.
Sealed in the fridge, 7–14 days. Flavor peaks in the first week.