Cold Brew Concentrate vs Ready-to-Drink: What's the Difference?
Concentrate is brewed at a high coffee-to-water ratio (1:4 to 1:8) and diluted before drinking. Ready-to-drink is brewed at drinking strength (1:12 to 1:15) and consumed as-is.
⚡ Quick Answer
Cold brew concentrate is brewed with a high coffee-to-water ratio (typically 1:4 to 1:8) and must be diluted 1:1 or 1:2 with water or milk before drinking. Ready-to-drink cold brew is brewed at drinking strength (1:12–1:15) and consumed straight. Concentrate has a longer fridge shelf life (2–3 weeks) vs RTD (1–2 weeks) because lower water activity slows oxidation.
🎯 Key Takeaway: Concentrate = brew strong, dilute to taste, lasts longer. RTD = brew at drinking strength, serve immediately or within 1–2 weeks. Most home brewers use concentrate for flexibility.
⚙️ Ratio Guide
Concentrate (1:4 to 1:8)
Brew with a high coffee dose relative to water. Example: 100g coffee to 500ml water (1:5). The result is very strong — not drinkable straight for most people.
- • Dilution: Mix 1 part concentrate with 1–2 parts water or milk
- • Over ice: Pour over ice which dilutes it naturally to drinking strength
- • Shelf life: 2–3 weeks refrigerated in sealed container
- • Best for: Flexibility — adjust strength per serving
Ready-to-Drink (1:12 to 1:15)
Brew at drinking strength. Example: 100g coffee to 1,400ml water (1:14). The result is similar strength to hot drip coffee.
- • Dilution: None needed — drink straight or over ice
- • Over ice: Will dilute further as ice melts — account for this
- • Shelf life: 1–2 weeks refrigerated
- • Best for: Convenience — no measuring at serving time
✅ Which Should You Make?
Make concentrate if:
You want flexibility to adjust strength per drink, you're making cold brew lattes (dilute with milk), or you want maximum shelf life. Most home brewers prefer this approach.
Make RTD if:
You want grab-and-go convenience, you're brewing for guests, or you want to replicate the strength of iced drip coffee without dilution math.