# Whole bean to ground coffee calculator

**Generally speaking, you should always be measuring your coffee by weight. This calculator is for when you don't have access to scales.** Enter your required ounces, grams, or number of beans, and this calculator will do the rest.

## How much does a single coffee bean weigh?

On average a coffee bean weighs `132.5 milligrams`

— equivalent to `0.1325 grams`

or `0.0046738 ounces`

.

We took 4 random packs of whole bean coffee and counted 100 beans from each one.

Then, we weighed each group of 100 beans and calculated the average.

Bean | Bean mean weight |
---|---|

Rwandan Filter Coffee Beans | 0.14 grams |

Random Garbage Dark Roast | 0.12 grams |

Illy Arabica | 0.12 grams |

Another random dark roast | 0.15 grams |

Average of all four | 0.1325 grams |

### How many grams of coffee are in a cup?

One cup filled with ground or whole bean coffee weighs roughly `82 grams`

.

Of course, if you're looking for an answer to how much grounds are in a brewed cup of coffee, that varies too much for a clear answer.

### How many grams of coffee are in one tablespoon?

One table spoon is equal to half an ounce.

So using the calculator above, it looks like a tablespoon of ground coffee weighs `5.13 grams`

— which is about `39 beans`

.

### Ground coffee to whole bean volume ratio

Curious if whole bean took up a greater volume than ground coffee, we set about testing it.

We measured out one cup of whole bean, ground it, then measured again. **Surprisingly, ground coffee takes up almost the exact amount of space as whole bean. So the ratio is one to one.**