What every calculator on BetterMoneyTools.com actually does.
Each tool answers one specific money question. This page explains, in plain English, what each calculator is computing, what assumptions it makes, and how to use the result to make a better decision.
The core idea
Most financial decisions come down to a small handful of formulas: compound growth, loan amortization, present value, future value, and a few flavors of inflation adjustment. The tools on BetterMoneyTools.com take those formulas, wrap them in a clean interface, and let you change one input at a time to see how the answer moves.
Everything runs in your browser. There is no server processing your numbers, no account, and nothing stored unless you explicitly save a snapshot to your own device.
Debt Payoff Calculator
The Debt Payoff Calculator applies your monthly payment across a list of debts using either the avalanche method (highest interest rate first) or the snowball method (smallest balance first). It walks the schedule month by month, applies interest, subtracts payments, and reports the date you'll be debt-free along with total interest paid. A "found money" slider lets you see how a small extra monthly payment shortens the timeline.
Mortgage Analyzer
The Mortgage Analyzer uses the standard mortgage amortization formula to compute principal, interest, taxes, and insurance (PITI). It also calculates the break-even point of a refinance — how many months until interest savings cover closing costs — and shows the impact of extra principal payments on loan term and total interest.
Net Worth Calculator
The Net Worth Calculator sums your assets, subtracts your liabilities, and produces a single number: what you'd have if you sold everything and paid everyone off today. It splits liquid from illiquid assets, projects the number forward at an assumed growth rate, and lets you save snapshots to track progress over time.
Emergency Fund Calculator
The Emergency Fund Calculator asks for your true essential monthly expenses — housing, utilities, food, insurance, minimum debt payments — and multiplies by your chosen buffer (typically 3 to 6 months). It compares the target to your current savings and tells you the gap, plus a simple risk indicator.
Retirement & FIRE Calculator
The Retirement Calculator projects your portfolio forward using compound growth on existing balances and ongoing contributions. It supports five planning modes — Lean, Regular, and Fat FIRE, plus Barista and Coast — and applies the standard 4% safe-withdrawal rule (adjustable) to translate a target annual income into a target portfolio size.
Investment Projection
The Investment Projection tool compounds a starting balance plus monthly contributions at your chosen rate of return, with optional annual contribution step-ups. It produces a year-by-year balance, total contributions versus total growth, and an inflation-adjusted view in today's dollars.
College Savings (529)
The College Savings Calculator takes today's tuition cost, applies tuition inflation forward to the year your child enrolls, and back-solves for the monthly contribution needed to fully fund the goal.
Cost of Homeownership
The Cost of Homeownership Calculator goes beyond the mortgage payment to include property taxes, insurance, HOA dues, utilities, and a CapEx maintenance reserve (typically 1–2% of home value annually) — the line item most "what can I afford?" calculators ignore.
Car True Cost
The Car True Cost Calculator bundles loan payment, insurance, fuel, maintenance, and depreciation into a single monthly cost — and a cost-per-mile figure — so you can compare vehicles on their real economic impact, not just sticker price.
Life Insurance Needs
The Life Insurance Needs Calculator uses the DIME framework (Debt, Income replacement, Mortgage, Education) to itemize coverage need, producing a recommended policy amount your family would need to maintain its standard of living.
Pay Raise Impact
The Pay Raise Impact Calculator shows what a salary increase actually means: after-tax monthly delta, change per paycheck, and — if you invested the difference — the 30-year compounded value of the raise.
How to interpret the results
Every calculator shows an answer based on the inputs you provide and a small set of clearly labeled assumptions (rate of return, inflation, tax rates). Change one input at a time to see how sensitive the answer is. If the result swings wildly when you nudge a single number, that's a sign your decision depends heavily on that assumption — which is useful information in itself.
These calculators are educational. They are not financial, tax, or legal advice. See our Terms of Use.