# Unit Sizes

Some configuration directives in [Fluent Bit](http://fluentbit.io) refer to unit sizes such as when defining the size of a buffer or specific limits. Plugins like [Tail Input](https://docs.fluentbit.io/manual/4.1/data-pipeline/inputs/tail), [Forward Input](https://docs.fluentbit.io/manual/4.1/data-pipeline/inputs/forward), or generic properties like [`Mem_Buf_Limit`](https://docs.fluentbit.io/manual/4.1/administration/backpressure) use unit sizes.

Fluent Bit v0.11.10 standardized unit sizes across the core and plugins. The following table describes the options that can be used and what they mean:

| Suffix               | Description                                                                           | Example                                          |
| -------------------- | ------------------------------------------------------------------------------------- | ------------------------------------------------ |
|                      | When a suffix isn't specified, assume that the value given is a bytes representation. | Specifying a value of `32000` means 32000 bytes. |
| `k`, `K`, `KB`, `kb` | Kilobyte: a unit of memory equal to 1,000 bytes.                                      | `32k` means 32000 bytes.                         |
| `m`, `M`, `MB`, `mb` | Megabyte: a unit of memory equal to 1,000,000 bytes.                                  | `1M` means 1000000 bytes.                        |
| `g`, `G`, `GB`, `gb` | Gigabyte: a unit of memory equal to 1,000,000,000 bytes.                              | `1G` means 1000000000 bytes.                     |