Calculators that show their working

Quick answers,
clearly explained.

CalcVane gives you the number and the steps behind it. Every calculation runs in your browser, so nothing you type is sent anywhere.

Calculators

Monthly principal and interest, with taxes, insurance, PMI and HOA, plus a year-by-year amortization summary.

Monthly payments on a personal, auto or other fixed loan, with optional extra payments.

Future value of a starting amount with regular contributions, at the compounding schedule you choose.

Percent of a number, percent change, percent difference and price after a discount.

Convert either way, with unpaid weeks, paid days off and the rate per hour actually worked.

Exact age in years, months and days, days between dates, and the weekday you were born.

Each result lists the formula with your numbers filled in, so you can check it.

There are no accounts and no uploads. Your inputs stay on your device.

Edge cases, such as a 0% rate or a leap-day birthday, follow a rule stated on the page.