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Coffee Ratio Calculator.

Calculate coffee dose from water mass and an explicit water-to-coffee ratio.

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Set your values

Results update as you type.

Coffee mass: 31.25 g

Coffee mass

31.2500g
Total brew mass: 531.25 g

Total brew mass

531.2500g

Results update automatically as you type.

Use Cases

Consistent daily brewing

Use the calculator to determine the exact coffee dose for your usual water amount, ensuring every cup tastes the same.

Example: For 600g water at 15:1, you need 40g of coffee.

Scaling recipes

Easily adjust your coffee amount when brewing for a group or using a different size coffee maker.

Example: Scaling from 300g to 900g water at 16:1 changes the dose from 18.75g to 56.25g.

Frequently Asked Questions

How do I use the Coffee Ratio Calculator?
Enter the amount of water in grams and your desired water-to-coffee ratio (e.g., 16:1). The calculator will output the required coffee dose in grams. For example, with 500g water and a 16:1 ratio, you need 31.25g of coffee.
What is a standard water-to-coffee ratio?
A common starting point is 16:1 (water to coffee) for drip coffee. For a stronger brew, try 15:1; for a milder cup, use 18:1. Adjust to taste.
Why should I measure coffee in grams?
Grams provide precision. Coffee density varies with grind size, so volume measurements (tablespoons) are inconsistent. Using grams ensures you replicate your favorite brew exactly.

Tips & Common Mistakes

Tips

  • Use a digital scale for both water and coffee for the most accurate results.
  • If your coffee tastes too strong, increase the ratio (e.g., from 15:1 to 17:1). If too weak, decrease it.
  • Remember that the ratio is water-to-coffee, so a higher number means a weaker brew.
  • For pour-over methods, a ratio between 15:1 and 17:1 is often recommended.

Common Mistakes to Avoid

  • Mixing up the ratio order: a 16:1 ratio means 16 parts water to 1 part coffee, not the other way around.
  • Using volume measurements instead of weight, which can lead to inconsistent strength.
  • Forgetting to adjust the dose when changing the water amount, resulting in over- or under-extraction.

Last updated: August 13, 2026