QuickCalculator

Free Online Calculators

Fast, free, and easy-to-use calculators for health, math, measurements, and finance. No signup required.


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Get results instantly with clear formulas and explanations

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Simple, clear calculators performed in your browser

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Popular Tools

The calculators visitors use most.

BMI Calculator
Calculate your Body Mass Index from height and weight.
Calorie Calculator
Estimate daily calories to maintain, lose, or gain weight.
Loan Calculator
Estimate monthly payments and total interest on a loan.
Currency Calculator
Convert between 200+ world currencies using live exchange rates.

Health / Fitness Calculators

Fitness, BMI, calories, and more.

BMI Calculator
Calculate your Body Mass Index from height and weight.
Calorie Calculator
Estimate daily calories to maintain, lose, or gain weight.
Body Fat Calculator
Estimate your body fat percentage using US Navy or BMI methods.
Age Calculator
Calculate your exact age in years, months, and days, plus totals in weeks, days, and hours.
Pregnancy Due Date Calculator
Estimate your due date and current gestational age from your last period or conception date.

Math Calculators

Percentages, fractions, algebra.

Percentage Calculator
Find what X% of Y is, or what percent X is of Y.
Scientific Calculator
Free online scientific calculator with trig, logarithms, powers, roots, parentheses, and constants like π and e.
Fraction Calculator
Add, subtract, multiply, and divide fractions. Shows the simplified result, mixed number, decimal, and step-by-step work.
Standard Deviation Calculator
Calculate sample or population standard deviation, variance, mean, median, and other statistics from a list of numbers.
Quadratic Equation Calculator
Solve quadratic equations ax² + bx + c = 0. Get the discriminant, real or complex roots, vertex, axis of symmetry, and factored form.
Pythagorean Theorem Calculator
Solve any side of a right triangle using a² + b² = c². Get the missing side, exact radical form, angles, area, and perimeter.

Measurements Calculators

Unit and length conversions.

Chmod Calculator
Convert Linux file permissions between octal (755), symbolic (rwxr-xr-x), and chmod-style notation. Interactive checkboxes for owner, group, and others.
Encode / Decode
Encode text to UTF-8 bytes or decode hex and Base64 byte strings using common character encodings.
Count Duplicates / Compare Lists
Count duplicates in a list, or compare two lists to find A-only, B-only, and shared items. Case/spacing/leading-zero options and multiple output formats.
Text Formatter
Clean up text: remove extra spaces, blank lines, duplicate lines; trim, reverse, normalize whitespace; format or minify JSON and XML. Live stats and download.
Password Generator
Generate strong random passwords, memorable passphrases, or numeric PIN codes.
Length Converter
Convert between meters, feet, inches, miles, and more.
Date Calculator
Find the duration between two dates, or add and subtract days, weeks, months, and years from any date.
GPA Calculator
Calculate your weighted and unweighted GPA from your course grades and credit hours on the 4.0 scale.
Character Count Calculator
Count characters, words, sentences, paragraphs, and spaces in any text. Free online text counter.

Finance Calculators

Loans, interest, and savings.

IBAN Generator
Generate a structurally valid IBAN from a country code and BBAN. Uses the MOD-97 checksum algorithm. For testing and education.
IBAN Checker
Validate IBAN format, length, and checksum. Free online IBAN checker that runs entirely in your browser.
Loan Calculator
Estimate monthly payments and total interest on a loan.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and a full amortization schedule. Includes property tax, insurance, HOA, and PMI.
Compound Interest Calculator
Calculate compound interest with optional monthly, quarterly, or annual contributions. See future balance and a year-by-year growth schedule.
Tip Calculator
Calculate the tip and total for a restaurant bill, with optional tax, custom tip percentages, and per-person split.
Income Tax Calculator (US)
Estimate your federal and FICA income taxes for 2026. Includes standard deduction, filing status, and optional state tax.
Salary Calculator (US)
Convert between gross salary and take-home pay. See your net pay per paycheck for weekly, bi-weekly, semi-monthly, or monthly frequencies.
Currency Calculator
Convert between 200+ world currencies using live exchange rates.
Sales Tax Calculator
Add sales tax to a price or extract tax from a total. Get the pre-tax price, tax amount, and total.
Discount Calculator
Calculate sale prices, discount percentages, or original prices. Supports stacked discounts, sales tax, and total savings.

Frequently Asked Questions

Common questions about QuickCalculator, our calculators, and how we handle your data.

Are the calculators on QuickCalculator free to use?

Yes. Every calculator on QuickCalculator is completely free, with no sign-up, no account, and no usage limits. You can run as many calculations as you like.

How accurate are the results?

Our calculators use standard, widely accepted formulas (for example, the Mifflin-St Jeor equation for calories and the BMI formula used by health authorities). Results are estimates intended for general guidance — not a substitute for professional medical, financial, or legal advice.

Do you store or share the numbers I enter?

No. All calculations run entirely in your browser. The values you type are never sent to our servers and are never stored or shared.

Do the calculators work on mobile phones and tablets?

Yes. QuickCalculator is fully responsive and works on phones, tablets, laptops, and desktop computers. The layout adjusts automatically to fit your screen.

Which unit system do you use — metric or imperial?

Where it matters, you can choose. Health calculators like BMI and Body Fat let you switch between metric (kg, cm) and imperial (lb, ft/in). Length and other converters support both systems side by side.

Can I use QuickCalculator for professional or commercial purposes?

You can use the results as a starting point for your own work, but we recommend verifying any figure that has real-world consequences (medical dosage, loan contracts, tax filings, etc.) with a qualified professional.

How often do you add new calculators?

We add new calculators regularly, prioritising the ones most requested by users. If there is a calculator you would like to see, let us know via the contact link in the footer.

Will QuickCalculator always be free?

Yes. QuickCalculator is supported by unobtrusive advertising, which keeps the tools free for everyone. Ads never affect the results you get.