Mortgage calculator
Estimate monthly mortgage payments with loan amount, interest rate, term, deposit, taxes, and fees.
Free web browser tools
Finance
Explore common personal-finance scenarios with transparent inputs and practical result breakdowns. Outputs are estimates, not financial advice.
Loan calculator
Calculate loan payments, total interest, and repayment schedules for personal loans and other borrowing.
Compound interest calculator
Calculate compound interest, investment growth, deposits, and future value with an easy online calculator.
Invoice generator
Create and download professional invoice PDFs for free. Add line items, tax, discounts, and your logo — no sign-up, saved only in your browser.
Salary / paycheck calculator
Estimate take-home pay from salary, tax, deductions, and pay frequency with an online paycheck calculator.
Sales tax / VAT calculator
Calculate sales tax or VAT online. Add tax to a price or work backwards from a tax-inclusive total.
Discount calculator
Calculate discounts, sale prices, savings, and final price after a percentage off.
Profit margin calculator
Calculate profit margin, markup, and gross profit from cost and selling price, or find the price needed to hit a target margin.
Retirement calculator
See how much you'll have at retirement, what income it can pay, and how much to save each month to hit your goal — adjusted for inflation.
401(k) calculator
Project your 401(k) balance at retirement with employer match, salary raises, and 2026 IRS contribution limits. Year-by-year growth table.
Salary to hourly calculator
Convert an annual salary to an hourly wage, plus daily, weekly, biweekly, and monthly pay. Adjust hours per week and paid weeks.
Hourly to salary calculator
Turn an hourly wage into annual salary, monthly, biweekly, and weekly pay. Includes overtime hours and unpaid time off.
Income tax calculator
Estimate 2026 US federal income tax and FICA, or UK 2026/27 income tax and National Insurance. See take-home pay and tax brackets.
Car loan calculator
Work out your monthly car payment with down payment, trade-in, sales tax, and fees. See total interest and a yearly payoff table.
House affordability calculator
How much house can I afford? Find your maximum home price from income, debts, down payment, rate, taxes, insurance, and lender ratios.
Amortization schedule calculator
Build a full loan amortization schedule by month or year. See principal vs interest, payoff date, and savings from extra payments.
Debt payoff calculator
Plan how to pay off multiple debts with the snowball or avalanche method. See your debt-free date, payoff order, and interest saved.
Credit card payoff calculator
Find how long it takes to pay off a credit card, or the monthly payment needed to be debt-free by a date. Shows total interest.
Inflation calculator
See what money from any year is worth today using official US CPI (from 1913) and UK price data (from 1800), or a custom inflation rate.
ROI calculator
Calculate return on investment, net profit, and annualized ROI (CAGR) from what you invested and what you got back.
Break-even calculator
Find the break-even point in units and revenue from fixed costs, price, and variable cost. Includes target profit and margin of safety.
Markup calculator
Calculate selling price from cost and markup, markup from cost and price, or cost from price. Shows gross margin alongside markup.
Overtime calculator
Calculate overtime pay at time and a half or any multiplier, plus double time. See total pay, overtime rate, and yearly earnings.
Currency converter
Convert currencies with daily central bank exchange rates — USD, EUR, GBP, JPY, and 25+ more. Historical rates back to 1999.
Receipt generator
Make receipts with items, tax, discounts, tips, and change. Download as an 80 mm till receipt or a Letter/A4 PDF.
Business name generator
Brainstorm business name ideas from your keywords. Pick an industry and style — modern, brandable, classic, or playful — and preview each as a logo.
Finance FAQs
How are tags used on ReallyUseful.Tools?
Tags group tools by shared traits such as file converter, in browser, or privacy friendly so you can filter the directory by feature.