About DuffelMath

DuffelMath builds careful, free calculators for service members and families facing a PCS, retirement or survivor-benefit decision. Each tool shows its formula, the rates it uses, when those rates were checked, and links to the official source so you can confirm them.

We are independent: not part of, or endorsed by, the DoD, DFAS, the VA or any service. The site is funded by optional paid Google Sheets planners linked from the calculators. Found an outdated rate? A contact form is coming soon.

Not official. Not financial, tax or legal advice. DuffelMath is an independent site and is not affiliated with or endorsed by the Department of Defense, DFAS, the VA or any military service. Estimates only; your finance office, transportation office and DFAS decide what you are actually paid. Rates as of 2026-10-25; check the linked official sources.