About DynastyMath
DynastyMath is an independent project owned and run by Matt, a person, not a company or news organization. It is a free, no-signup tool site: Win the week. Win the trade. Build the dynasty.
Purpose
I built DynastyMath to help people work out start/sit and dynasty trade decisions in fantasy football with real numbers instead of guesses. The calculators run in your browser, show their formulas, and let you change every assumption. The guides explain the numbers behind the tools in plain language.
Data sources
Player data, injuries, projections, ADP and trending adds come from the Sleeper public API. Dynasty trade values come from DynastyProcess open data (GPL-3.0), combined with Sleeper and Fantasy Football Calculator dynasty ADP and nflverse production into a composite value. The page "How our values work" explains the weights, and the data refreshes daily.
How we keep it accurate
The math is covered by automated tests with hand-computed answers, figures show their source and update date where possible, and the site was last updated October 14, 2026. If you spot an error, please tell me and I will fix it.
Disclaimers
For entertainment. No outcome is guaranteed. 21+ for paid contests; play responsibly, 1-800-GAMBLER. Not affiliated with the NFL, Sleeper, DynastyProcess, Fantasy Football Calculator or nflverse. Dynasty values © DynastyProcess, GPL-3.0. See the terms of use and privacy policy.
Contact and feedback
Email matt63sorensen@yahoo.com, use the Feedback button on any page, or open an issue on GitHub. More on the contact page.