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Financial Calculators and Reference Tools
Fin Loom's calculators turn the formulas behind our articles into tools you can test with your own numbers. Each one runs in your browser, shows its formula and assumptions, and explains the result in plain language.
They are educational estimates, not predictions or advice.
16 calculators
Money and Banking
- Inflation CalculatorCompare a dollar amount across years using official BLS CPI-U data from 1913 to 2026.
- Credit Card Debt Payoff CalculatorSee how long a card balance could take to clear and how much an extra payment could save.
- Mortgage Payoff CalculatorEstimate how much sooner extra payments could pay off a mortgage and the interest they could save.
- Daily Compound Interest CalculatorSee how a balance grows over a set number of days, and compare daily, monthly, and annual compounding.
- APY CalculatorConvert an interest rate and compounding schedule into annual percentage yield.
- Savings Interest CalculatorEstimate savings growth from a starting balance, APY, and monthly deposits.
Investing
- Investment Growth CalculatorProject a portfolio from a starting amount, monthly contributions, and an assumed return, with an inflation-adjusted view.
- Dividend Reinvestment Plan CalculatorModel how reinvested dividends change share count and income over time.
- Dividend Total Return CalculatorSplit a holding's total return into price gain and dividend income, with an annualized rate.
- Investment Withdrawal CalculatorEstimate how long a portfolio could last at a given withdrawal, or how much it could support.
Tax
- Capital Gains Tax CalculatorEstimate 2026 federal tax on a short-term or long-term gain using IRS brackets.
- 401(k) Withdrawal Tax CalculatorEstimate federal tax, the 10% early-withdrawal additional tax, and the 20% withholding on a 401(k) withdrawal.
- Self-Employment Tax CalculatorWork out 2026 Social Security and Medicare tax on net self-employment earnings.
- 1099 Tax CalculatorEstimate how much of 1099 income to set aside for federal self-employment and income tax.
Markets and Stocks
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How These Calculators Work
Every calculator follows the same pattern. Inputs sit on the left, the main answer and key figures on the right, and a chart, a detailed table, the assumptions, and a disclaimer follow below. Results update as you type or drag a slider, and an invalid entry is flagged next to the field without clearing the last valid result.
The calculators use fixed assumptions to keep the math transparent. Real returns, rates, prices, and taxes vary, so treat each result as a starting point for understanding, not a forecast.
Want a quick answer before you calculate? The FAQ hubs cover money and banking, investing, and payments in plain language.