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, and your inputs aren’t sent to a server unless you share a link.
Calculators
Mortgage calculator
Monthly principal and interest, taxes, insurance, PMI, HOA and start-date balance tracking.
Open calculator →Car loan calculator
Auto payments or vehicle budget with down payment, trade-in, payoff, sales tax and fees.
Open calculator →Loan calculator
Monthly payments on a personal or fixed installment loan, synced to your start date with optional extras.
Open calculator →Compound interest
Future value of a starting amount with regular contributions, at the compounding schedule you choose.
Open calculator →Percentage calculator
Percent of a number, percent change, percent difference and price after a discount.
Open calculator →Salary to hourly
Convert either way, with unpaid weeks, paid days off and the rate per hour actually worked.
Open calculator →Age and date difference
Exact age in years, months and days, days between dates, and the weekday you were born.
Open calculator →How CalcVane works
Working shown
Each result lists the formula with your numbers filled in, so you can check it.
Private by design
There are no accounts and no uploads. Your inputs stay on your device.
Plain rules
Edge cases, such as a 0% rate or a leap-day birthday, follow a rule stated on the page.