Enter the overlap percentage, overlap area, and total area into the calculator to determine the missing variable.

Overlap Percentage Calculator

Enter any 2 values to solve the missing one. This is the main version most visitors are likely expecting from an overlap percentage calculator.

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Overlap Area
Reference Area
Overlap Percentage
Formula: Overlap Percentage = (Overlap Area ÷ Reference Area) × 100

Use this secondary tab to compare two lists or sets and measure how much they overlap.

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This tab returns shared count, unique counts, overlap relative to each list, and Jaccard similarity.
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Overlap Percentage Formula

The following formula is used to calculate the overlap percentage for a given overlap area and total area.

O = (A_o / A_t) * 100

Variables:

  • O is the overlap percentage
  • A_o is the overlap area
  • A_t is the total area

To calculate the overlap percentage, divide the overlap area by the total area and multiply the result by 100 to get the percentage.

What is Overlap Percentage?

Overlap percentage is a measure of how much one area overlaps with another area, expressed as a percentage of the total area. This metric is commonly used in various fields such as geography, biology, and computer science to quantify the degree of overlap between two regions or datasets. For example, in image processing, overlap percentage can be used to determine how much of one image overlaps with another, which can be useful for tasks like image registration and object detection.

How to Calculate Overlap Percentage?

The following steps outline how to calculate the Overlap Percentage.

  1. First, determine the overlap area (A_o).
  2. Next, determine the total area (A_t).
  3. Next, calculate the overlap percentage using the formula O = (A_o / A_t) * 100.
  4. Finally, calculate the Overlap Percentage.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Overlap area (A_o) = 50

Total area (A_t) = 200