Why CalcVane exists

CalcVane is a small, independent calculator site for everyday math and personal-finance figures. It started from a simple frustration: most calculator sites give you a number but not the reasoning behind it, and many are crowded with ads near the button you need to press.

How the calculators are built

• Every result shows its working, using the formula listed on the same page.
• Edge cases follow a stated rule, such as how a February 29 birthday is counted.
• Each page lists its sources and the date it was last reviewed.
• Calculations run in your browser. Nothing you type is sent to a server.

Corrections

If you find a mistake, please tell us. We check each report and update the page and its review date when we fix something.

CalcVane doesn’t publish testimonials or ratings, and the calculators aren’t financial, legal or medical advice.