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Clear numbers for life's big changes

HealthCalcPro is a set of free, private calculators for the moments that change a woman's body or budget: a divorce, a wedding, a new baby, perimenopause and retirement. Each one shows its method and its sources, and nothing you type leaves your browser.

Free calculators

Books by Nancy Whitaker

Plain-English books for women in their sixties and seventies, where every number carries its source.

How we build these calculators

  • Published rules only

    Every formula comes from a named source, such as Social Security or HUD, linked on the page.

  • Private by design

    Calculations run in your browser. We do not store or receive what you type.

  • Tested before publishing

    Every formula is covered by automated tests, including Social Security's own examples for the retirement calculator.

Built by Melike and İsmail, a wife-and-husband team. Read our story.