Cold Brew Calculator
Pick concentrate or ready-to-drink mode, set your ratio, and get the right amounts instantly.
Cold brew coffee calculator
Enter either value; the other updates automatically.
Dilution
Total volume
servings (250 ml)
Concentrate vs. Ready to Drink
Cold brew concentrate uses a high coffee-to-water ratio (around 1:5) to produce a strong base that you dilute before drinking. This is the most popular approach for batch brewing because a single jar of concentrate can last you all week. Mix it with water, milk, or pour it over ice.
Ready-to-drink cold brew uses a weaker ratio (around 1:12) so you can drink it straight from the fridge. It takes more water upfront and produces a lighter body, but there's no extra step before you can enjoy it.
Neither method is better. Concentrate is more flexible and space-efficient. Ready-to-drink is grab-and-go convenient. Try both and see what fits your routine.
Quick Reference
| Batch size | Concentrate (1:5) | Ready to drink (1:12) |
|---|---|---|
| 500 ml | 100 g coffee | 42 g coffee |
| 1 L | 200 g coffee | 83 g coffee |
| 2 L | 400 g coffee | 167 g coffee |
FAQ
How long should cold brew steep?
12 to 18 hours in the fridge is the sweet spot for concentrate. Ready-to-drink batches can go up to 24 hours since the ratio is more forgiving. Going past 24 hours tends to pull out harsher flavors, so set a reminder.
What grind size for cold brew?
Coarse grind, similar to raw sugar or sea salt. Too fine and your brew will over-extract and taste bitter. If you're using a blade grinder, pulse in short bursts and aim for chunky, even pieces.
How long does cold brew last in the fridge?
Concentrate keeps well for up to two weeks in a sealed container. Ready-to-drink batches are best within 5 to 7 days. You'll notice the flavor dulling after that, so brew in amounts you'll actually finish.
Can I use regular ground coffee for cold brew?
You can, but pre-ground coffee is usually medium-fine, which is too small for cold brew. It'll over-extract and be harder to filter. If coarse grinding at home isn't an option, ask your local shop to grind beans on a coarse setting.