F1 Score From Precision Recall
Use this f1 score from precision recall tool when you have measured values for precision, recall. It applies a transparent mathematical relationship to those values to return an answer in %. Unlike a prediction or recommendation, this is a calculation from your inputs. Precision and recall must refer to the same classification threshold. Enter a different scenario to see how this particular quantity changes; check the assumptions before using it in a project.
How to use this calculator
- Use exact measurements and consistent units for precision, recall.
- Enter each quantity; blank, nonnumeric and out-of-range inputs are not accepted.
- Compare the reported % quantity against your own data and the limitations below.
Formula for F1 Score From Precision Recall
% = 200*precision*recall/(precision+recall). Inputs are expressed in the units shown by the labels.
- This uses a direct stats relationship and does not retrieve remote data, forecasts or individual account information.
- Precision and recall must refer to the same classification threshold.
Worked examples
Worked example — F1 Score From Precision Recall
Enter Precision = 0.78, Recall = 0.84.
Apply 200*precision*recall/(precision+recall).
Calculated value: approximately 80.88889 %.
Understanding the result
The example produces about 80.88889 %; this is a mathematical output for the example inputs, not an observed result for your project.
Precision and recall must refer to the same classification threshold.
Important notes
Precision and recall must refer to the same classification threshold.
Use values from the same measurement period or physical system. The result is in % and is not a guarantee of capacity, safety, ranking or revenue.
Frequently asked questions
What does F1 Score From Precision Recall calculate?
It converts precision, recall into a quantity measured in % using the stated formula.
Which assumption matters most?
Precision and recall must refer to the same classification threshold.
How can I check this output?
Recalculate the worked example from the input quantities, confirm units and compare with direct measurements where available. This calculator does not fetch live data.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.