Money decisions,with the math shown.
Pick a decision. Move a slider. See what it really costs, in dollars.
Pick a decision
Mortgage
What will the house really cost?
7.40%30-year average, Oct 8, 2026Car loans
What will this car really cost?
7.47%new-car loan rate at banks, Aug 2026Interest rates
How do rates change my bills?
3.75–4.00%Fed target since Sep 17, 2026Credit & debt
Which debt should I pay first?
21.19%average card rate, Aug 2026Health insurance
Which plan costs me the least?
$12,000most a 2027 plan can charge youTaxes
Where does my paycheck go?
$16,100standard deduction, 2026Savings & retirement
Am I saving enough?
$24,500401(k) limit, 2026Glossary
Any money word, in plain English.
127terms on index cards
4 things most people miss
Every formula is checked against worked examples from the IRS, CFPB and SEC. All 51 checks pass. How we check
