Free online calculators & tools
that just work

Mortgage and loan calculators, savings and retirement planners, BMI, unit converters, password and QR generators — fast, accurate and private.

18 free tools0 sign-ups100% in your browser

💰 Finance & Money

Mortgage, loans, savings, salary and everyday money math.

🏠Mortgage CalculatorEstimate your monthly mortgage payment including principal, interest, property tax, home…💵Loan CalculatorCalculate the monthly payment, total interest and full amortization schedule for any personal,…📈Compound Interest CalculatorSee how your savings grow with compound interest and regular monthly deposits. Includes a…🏖️Retirement CalculatorProject your retirement savings from your age, current balance, monthly contributions and…💳Credit Card Payoff CalculatorFind out how many months it takes to pay off a credit card, the total interest you will pay,…🚗Auto Loan CalculatorEstimate your monthly car payment including sales tax, down payment and trade-in value, with…💼Salary ConverterConvert pay between hourly, daily, weekly, bi-weekly, monthly and annual salary based on your…➗Percentage CalculatorThree quick percentage calculators: X% of a number, what percent one number is of another, and…🍽️Tip CalculatorQuickly calculate the tip and split the restaurant bill between any number of people, with…🏷️Discount CalculatorFind the final sale price after a percentage discount, including stacked coupons and sales tax,…

❤️ Health & Fitness

BMI and daily calorie needs based on proven formulas.

⚖️BMI CalculatorCalculate your Body Mass Index in imperial or metric units, see your weight category and the…🔥Calorie CalculatorEstimate your BMR and total daily energy expenditure with the Mifflin-St Jeor equation, plus…

🗓️ Date & Time

Exact age, days between dates and business-day counts.

🎂Age CalculatorCalculate your exact age in years, months and days, total weeks and days lived, the weekday you…📅Days Between DatesCount the number of days, weeks and business days between two dates, or add and subtract days…

🧰 Everyday Utilities

Unit conversion, secure passwords, QR codes and word counts.

📏Unit ConverterConvert between metric and US customary units for length, weight, temperature, volume, area and…🔐Password GeneratorGenerate strong random passwords in your browser with adjustable length and character sets.…🔳QR Code GeneratorCreate free QR codes for links, text or Wi-Fi networks. Customize the size and download as PNG…📝Word CounterCount words, characters, sentences and paragraphs instantly, with reading time, speaking time…

Why ToolNest?

Every calculator on ToolNest uses the same standard formulas banks, lenders and health organizations publish, and every result updates instantly as you type. Your numbers never leave your device: the math runs locally in your browser, so you can plan a mortgage, a debt payoff or a diet privately.

Each tool explains how it works, shows the formula and answers common questions, so you understand the result — not just the number.