# Logs formulas

You can combine log metrics over facets or labels into formulas, to get additional insights. For example, compare the activity on pinot to the activity on to the overall count, to determine error percentage.

Here, we start with the side-by-side metric display of `aws_logs_call_count` and `aws_logs_error_count` demonstrated in [Add query](https://docs.kloudfuse.com/platform/3.2.5/metrics-queries/#query-add) and [Separate queries](https://docs.kloudfuse.com/platform/3.2.5/metrics-queries/#separate) sections.

## Add formula

You can combine metrics over facets or labels into formulas, to get additional insights.

1. To add a formula, click  (Add Formula).

2. The empty formula option appears in interface as line  (1), under the query lines.

3. Type the formula in the text box next to label  (1).

Here, use a formula to determine when the count of log events for profile server exceeds the count of pinot profiler events, and by how much. Simply subtract query  from .

4. The interface displays graphs for both queries and the new formula.

## Remove a formula

1. To remove a formula, click  (Delete) icon that corresponds to the formula you plan to remove.

2. The formula is no longer in the interface.