Calculators that show you the actual numbers.
Pair the guides with simple, no-signup calculators. Punch in your real figures, see what the decisions cost — or save — over time. Nothing is sent to a server; the math runs in your browser.
Not sure which one you need? Browse by situation
Start with your paycheck
Every other tool builds on what actually lands in your bank. Three minutes to set up your numbers — the budget, emergency fund, employer match, and investing tools then offer to pull from it.
See your numbersOrder of operations
Nine questions, then the standard money sequence applied to your numbers — which step to fund next, which are done, which to skip.
Take the walkthroughKnow what comes in, where it goes.
Before investing, before paying down debt — get the floor solid.
Paycheck gross to net
See exactly where each gross dollar goes — federal + FICA + state tax, pre-tax deductions, Roth, and what actually lands in your bank account.
Tax bracket explorer
Move an income slider and watch each federal bracket light up only as your dollars reach it. See why your effective rate is always lower than your top marginal bracket.
Budget builder
Build a real monthly budget across needs, wants, and savings. Saved to your browser only — come back next month and edit what changed.
Emergency fund sizing
Find the right cushion for your life stage and see how long it'll take to build at your current monthly savings rate.
Savings rate are you on track?
Add up everything you save — contributions, employer match, more — over gross pay to get your real rate, then read a rate-by-years grid showing whether it clears a comfortable retirement.
Pay it down on a plan — and see the date.
Snowball, avalanche, extra principal. Watch the payoff date move.
Debt payoff snowball / avalanche
Compare snowball and avalanche strategies. See your debt-free date, total interest, and which debt to focus on first under each approach.
Mortgage payoff with extras
Add extra monthly principal, lump sums, and bi-weekly payments. See your new payoff date, total interest, and how much you saved versus the original schedule.
Match, compound, and choose your tax timing.
Capture free money, let it grow, and pick where you'd rather pay tax.
Employer match left on the table
See what under-contributing to your 401(k) costs you in employer match — per year, and projected over a decade.
Compound growth visualizer
Monthly contribution, time horizon, return rate — see how much of your final balance is your money vs. growth, and what waiting to start really costs.
Roth vs. Traditional
Compare after-tax outcomes for Roth and Traditional contributions across plausible future tax brackets — same out-of-pocket cost, different tax timing.
Job offer comparator
Put two offers side by side — base, 401(k) match, and bonus. See which one wins on total value over the years you'd stay once the match and bonus are invested, not just on headline salary.
Will the money last.
Stress-test withdrawals against real spending and Social Security.
Retirement withdrawal
Plug in your portfolio, retirement age, spending, and Social Security. See how long the money lasts in today's dollars — or how much remains at age 100.
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Glossary of terms
One-sentence definitions for every term used across the guides and calculators — accounts, tax timing, investing, debt, retirement.
→Subject index
The back-of-book index — every topic on the site, with its guide, calculator, and chart anchors gathered into one row.
→Every chart in one place
118 figures across the site, grouped by shape — bar, line, donut, flow. Click any card to land on the chart in context.
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