Guides with calculators.
Each guide opens with a calculator that runs on your numbers, then explains the math in plain words. Nothing here is saved or sent anywhere; it all runs in your browser.
Biweekly mortgage calculator: monthly vs half-payments every payday
See what paying half your mortgage every payday saves in interest and years, using your own balance, rate and payment. And what to check before your servicer holds a half payment in suspense.
5 min read · updated Sep 2026CalculatorHow much to keep in checking when you’re paid every two weeks
A checking buffer is the balance you never plan to spend. Work out yours from your largest bill and a week of ordinary spending, and see why it comes before savings.
4 min read · updated Sep 2026CalculatorPaycheck budget: split one check into bills, buffer, and what’s left
Budget one check at a time. Enter the check, the bills due before your next payday, and your checking floor to see what this check has to cover and what is left.
5 min read · updated Sep 2026CalculatorPMI removal: check your loan-to-value and generate the letter
Find out whether you can cancel private mortgage insurance now, on the original value or today’s value, and generate the written request your servicer expects, with your numbers filled in.
5 min read · updated Sep 2026Calculator3-paycheck months in 2026 and 2027, and what to do with the extra check
Paid every two weeks, you get 26 checks a year, so two months carry three. Enter your next payday to see which months, for the next two years, and what one extra check could do for your emergency fund, your card, or your mortgage.
4 min read · updated Sep 2026CalculatorWhen to pay your credit card so it reports a low balance
Your card has a closing date and a due date, and only one of them sets your score. Enter your balance, limit and closing day to get the exact amount to pay, and by when, to report under 30% or 10%.
4 min read · updated Sep 2026