26 free tools · no sign-up

Free online calculators and tools

Fast, no sign-up, and explained step by step. Your data never leaves your browser.

Most popular

Paycheck Calculator 2026

Estimate your take-home pay after federal income tax, Social Security, Medicare, state tax and 401(k).

Mortgage Calculator

Estimate your monthly mortgage payment including property tax, home insurance and PMI.

Mortgage Payoff Calculator

See how much time and interest you save by making extra monthly payments on your mortgage.

Auto Loan Calculator

Estimate your monthly car payment with down payment, trade-in and sales tax.

Salary to Hourly Calculator

Convert an annual salary into hourly, weekly, biweekly and monthly pay.

Calorie Calculator

Find out how many calories you need per day to maintain, lose or gain weight.

Why use ToolsLabOnline

No sign-up

Open a tool and use it. No accounts, downloads or limits.

Your data stays yours

Calculations run in your browser. What you type is never uploaded or stored.

Math you can check

Every tool shows its formula, a worked example and the limits of the result.

Built for the US

Dollars, sales tax, PMI, overtime and US units. The Spanish version is adapted to Spain.

All tools

Finance

Compound Interest Calculator See how your savings grow with compound interest and monthly contributions. Loan Calculator Calculate the monthly payment, total interest and total cost of a loan. Mortgage Calculator Estimate your monthly mortgage payment including property tax, home insurance and PMI. Auto Loan Calculator Estimate your monthly car payment with down payment, trade-in and sales tax. Savings Goal Calculator Find out how much you need to save each month to reach your goal on time. Mortgage Payoff Calculator See how much time and interest you save by making extra monthly payments on your mortgage. 401(k) Calculator Project your 401(k) balance at retirement with your contributions, employer match and 2026 contribution limits. Credit Card Payoff Calculator See how long it takes to pay off your credit card and how much interest you pay, or the payment you need to be debt-free by a date. 50/30/20 Budget Calculator Split your take-home pay between needs, wants and savings with the 50/30/20 rule or another ratio.

Work & pay

Time Card Calculator Add up hours worked per day and week, minus breaks, with overtime pay over 40 hours. Salary to Hourly Calculator Convert an annual salary into hourly, weekly, biweekly and monthly pay. Paycheck Calculator 2026 Estimate your take-home pay after federal income tax, Social Security, Medicare, state tax and 401(k).

Percentages & prices

Percentage Calculator Find a percentage of a number, what percent one number is of another, or the percent change. Discount Calculator Work out the sale price after a discount and how much you save. Sales Tax Calculator Add sales tax to a price or work backwards from a total to find the pre-tax amount. Tip Calculator Calculate the tip and split the bill between any number of people. Proportion Calculator Solve proportions and find the missing value in A/B = C/X, direct or inverse.

Health

BMI Calculator Calculate your body mass index (BMI) and the healthy weight range for your height. Calorie Calculator Find out how many calories you need per day to maintain, lose or gain weight. Due Date Calculator Estimate your due date and how far along you are from the first day of your last period.

Dates

Age Calculator Calculate your exact age in years, months and days, plus the countdown to your next birthday. Days Between Dates Calculator Count the days, weeks and business days between two dates.

Text

Word Counter Count words, characters, sentences and paragraphs and estimate reading time.

Utilities

QR Code Generator Create a free QR code for a link or text and download it as a PNG. It never expires. Password Generator Generate strong random passwords in your browser. Nothing is stored or sent anywhere. Unit Converter Convert between miles and kilometers, pounds and kilograms, Fahrenheit and Celsius, gallons and liters, and more.

Latest guides

How Much Should You Put in Your 401(k)?

2026 401(k) contribution limits, why the employer match comes first, and how much different savings rates could grow to by retirement.

How to Pay Off Credit Card Debt Faster

What minimum payments really cost, the avalanche and snowball methods, and when a balance transfer or consolidation loan makes sense.

How to Estimate Your Take-Home Pay in 2026

What comes out of a US paycheck, how federal income tax and FICA are calculated with 2026 figures, and worked examples.

See all guides →