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Coverage Estimator

The testers marked below account for an approximate coverage of of the genome of

Next tester suggestion

This tool lets you estimate the proportion of an ancestor's DNA accounted for by their DNA-tested descendants as marked in a tree.

Estimated coverage will appear here once you enter the subject's name below and mark people in the tree who have tested.

You can also import a GEDCOM file or a file from WATO via the Load menu.

To indicate that someone is deceased and unable to test, hover over them in the tree, click Add/Edit Details and enter a death year.

See an example tree

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This is an example tree. Create a new tree by clicking here

You are viewing this coverage tree in read-only mode. If you would like to make edits, please click Save and make a copy in your DNA Painter account first.


To import a GEDCOM (family tree) file into the Coverage tool, click 'Import GEDCOM' below and select your file. You can then select a person from the tree and the site will extract all their descendants.

Please select a valid file
(only text files downloaded from this tool will work!)

Or: browse for a tree data file saved from this tool

This is a text file; only a file downloaded from this tool or from WATO will work


This tree is being saved locally on your computer and will appear on this page unless you reset your browser. If you'd like to save this tree to your DNA Painter account, please sign in or register (free).

Note - if you empty your browser cache, this tree will be deleted.

Experimental: you can save an image of this tree. The results may vary according to your browser. For the best results, try to maximize the size of the window before clicking this button. This feature works best in the Chrome, Firefox and Safari browsers.

You can also download the data for this tree locally and load it back into the tool later (or send it to someone else so they can load it in).

To do this, click the button below.


If you'd like to share a link to this tree you need to save it first.

Please click 'Save' and then 'Save tree' and try again.


You can delete this tree. This action cannot be undone


Testing database for those marked as tested

Tree orientation

Background colour of saved images

Hover over a person for options. Scroll to the right to see children.

Click to add notes

About this tool

This tool was adapted from the What are the Odds? codebase. It was developed by Jonny Perl and conceived with Paul Woodbury and Leah Larkin.

© DNA Painter 2022


  • The coverage percentages generated by this tool are based on regular inheritance patterns (for example, you might expect to inherit about 25% of a grandparent's DNA). In practice, the actual amount inherited may be higher or lower than this, so the output from this tool is a guide only and is not absolute.
  • If one or more testers are related more than once to the person for whom you're estimating coverage, they should be entered into the tree and marked as testers multiple times.

More information


Paul and Leah came up with the calculations and Jonny implemented them in JavaScript and made the tool.

The static tree layout was adapted from an example by Peiwen Lu.