An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

OECD Maximum Residue Limit Calculator

With the goal of harmonizing the calculation of maximum residue limits (MRLs) across the Organisation for Economic Cooperation and Development, the OECD has developed an MRL Calculator. View the OECD MRL calculatorExit

It is made up of an Excel spreadsheet simple to use without requiring the user to have extensive statistical knowledge. 

Canada and the United States, along with other OECD member countries, use the OECD MRL Calculator to calculate pesticide tolerances or MRLs. The OECD MRL Calculator replaces and supersedes the NAFTA MRL Calculator.

Top of Page