Financial Calculators

Plan a mortgage, pay off debt faster, project investment growth, or estimate your taxes — free, in your browser, no account required.

Page verified • Last updated: August 2026

NumCalcX has 55 financial calculators covering the most common money decisions — buying a home, managing debt, growing savings, planning retirement, and pricing a product. Every tool below runs entirely client-side: nothing you type is sent to a server, and there's nothing to sign up for. Click any calculator to jump straight in.

Loans & Debt

Mortgage Calculator

Estimate your monthly home payment, total interest, and full amortization schedule. Example: a $300,000 home with 20% down at 6.5% over 30 years.

Loan Payoff Calculator

See how much faster you pay off any loan — and how much interest you save — by adding extra monthly payments.

Auto Loan Calculator

Calculate your monthly car payment, total interest, and full amortization schedule, including an optional trade-in value.

Student Loan Calculator

Calculate your monthly student loan payment, total interest, and full amortization schedule for a federal or private loan.

Personal Loan Calculator

Calculate your monthly personal loan payment, total interest, and full amortization schedule for an unsecured loan.

Business Loan Calculator

Calculate your monthly business loan payment, total interest, and full amortization schedule for a fixed-rate small business loan.

Boat Loan Calculator

Calculate your monthly boat loan payment, total interest, and full amortization schedule for a fixed-rate marine loan.

FHA Loan Calculator

Calculate your FHA mortgage payment including Upfront and Annual Mortgage Insurance Premium (MIP), plus total interest.

Home Equity Loan Calculator

Calculate your home equity loan payment, available equity, and total interest owed.

HELOC Calculator

Calculate your Home Equity Line of Credit payments for both the draw period and the repayment period.

Refinance Calculator

Compare your current loan to a refinanced loan, including monthly savings and the closing-cost breakeven point.

Debt Consolidation Calculator

Compare your current separate debts against a single consolidated loan side by side.

Debt-to-Income Ratio Calculator

See your DTI percentage and how it's classified against common lender reference thresholds.

Lease Calculator

Calculate a monthly lease payment for equipment or machinery from cap cost, residual value, and money factor.

Auto Lease Calculator

Calculate your monthly car lease payment from negotiated price, residual value, money factor, and term.

Retirement & Investing

401(k) Retirement Calculator

Project your 401(k) balance at retirement, combining your own contributions, an employer match, and compound growth.

IRA Calculator

Project how a Traditional IRA balance grows over time with annual contributions and compound investment returns.

Roth IRA Calculator

Project how a Roth IRA balance grows with after-tax contributions and compound returns withdrawn completely tax-free.

RMD Calculator

Estimate your Required Minimum Distribution from a traditional IRA or 401(k) using the IRS Uniform Lifetime Table.

Pension Calculator

Estimate your defined-benefit pension payout from final average salary, years of service, and benefit multiplier.

Annuity Calculator

Project the future value of an annuity funded with equal monthly contributions at a fixed rate of return.

Annuity Payout Calculator

Find the fixed monthly payout that exactly depletes an annuity balance to zero over your chosen period.

Social Security Calculator

Get a simplified estimate of your monthly Social Security benefit at full retirement age. Not an official SSA calculation.

IRR Calculator

Calculate the Internal Rate of Return from an initial investment and a series of period cash flows.

Payback Period Calculator

Calculate how long it takes to recover an initial investment from its expected annual cash flow.

Bond Calculator

Calculate a bond's price from face value, coupon rate, market yield, and time to maturity.

CD Calculator

Calculate a Certificate of Deposit's maturity value, total interest earned, and early withdrawal payout.

Mutual Fund Calculator

Project mutual fund growth including the drag of the expense ratio, showing the real dollar cost of fees.

Investment Calculator

Model regular contributions plus growth over time — for a retirement account, brokerage account, or any recurring investment plan.

Present Value Calculator

Calculate the present value of a future lump sum using a discount rate — what a future payment is worth today.

Future Value Calculator

Calculate the future value of a lump sum, plus optional monthly contributions, at a given annual rate of return.

Taxes

Income Tax Calculator (US Federal)

Estimate your US federal income tax by bracket, filing status, and standard deduction.

Estate Tax Calculator (US Federal)

Estimate federal estate tax owed above the exemption threshold, taxable estate, and effective rate.

Marriage Tax Penalty / Bonus Calculator

Compare filing jointly vs. filing separately to see whether your combined income triggers a marriage tax penalty or bonus.

Take-Home Paycheck Calculator

Estimate net pay per paycheck after federal tax and FICA, based on salary, filing status, and pay frequency.

Sales Tax Calculator

Calculate the total price after sales tax, the tax amount, or the pre-tax price using your own local tax rate.

VAT Calculator

Add VAT to a net price or remove VAT from a gross price, using your own applicable VAT rate.

Real Estate & Housing

Rent Calculator

See how much rent you can afford using the standard 30% rule, plus a 25%-30% conservative-to-standard range.

Rent vs. Buy Calculator

Compare the total cost of renting against the net cost of buying a home over time.

House Affordability Calculator

Enter your income, debts, down payment, and mortgage terms to estimate the maximum home price you can afford.

Real Estate Investment Calculator

See a property's cap rate and cash-on-cash return from its value, rental income, expenses, and cash invested.

Rental Property ROI Calculator

See your return on investment and net annual income from a rental property's income, expenses, and total investment.

Down Payment Calculator

Figure out how much to save for a home down payment, and how long it'll take at your current savings rate.

Everyday Money

Simple Interest Calculator

Calculate simple interest earned or owed on a principal amount over time, plus the total amount at the end of the period.

Compound Interest Calculator

Project how savings or investments grow over time with compounding. Example: $10,000 at 7% annual return over 20 years.

Credit Card Payoff Calculator

Find out how long it'll take to pay off a credit card balance at your interest rate, and how extra payments speed it up.

Net Worth Calculator

Add up your assets and subtract your debts to see your total net worth at a glance.

Profit & Margin Calculator

Calculate profit margin, markup percentage, or break-even point for pricing a product or service.

Tip Calculator

Split a restaurant bill and calculate the right tip, with a per-person breakdown.

Discount Calculator

Calculate the sale price after a percentage discount, or work out what percent off you're actually getting.

APR Calculator

Calculate the effective APR of a loan once upfront fees are factored in, versus its stated nominal rate.

Salary Calculator

Convert an hourly rate to annual salary, with automatic 1.5x overtime pay for hours over 40 per week.

Budget Calculator

Track monthly income against category expenses and see leftover cash, plus a 50/30/20 rule reference.

Commission Calculator

See the commission owed and the net amount to the seller from a sale amount and commission rate.

Depreciation Calculator

Calculate asset depreciation using the straight-line or declining balance method, with a full year-by-year schedule.