Proportion Calculator

Solve proportions: if A/B = C/D, find the missing value.

Missing Value (D)

8.0000

Leave one field empty to solve for it

About Proportion Calculator

This is a free, fast, and fully client-side proportion calculator tool. All processing is done locally within your browser to ensure maximum privacy and security. No data is sent to our servers. Bookmark this page for quick access to ad-free, high-performance SEO and developer utilities.