Free Online Tools — Private & Secure
A collection of free, browser-based utilities. Everything runs in your browser — share any calculation via a unique link, or embed any tool directly on your website.
Runs entirely in your browserShareable calculation linksEmbeddable on any website
Volume Converters
Finance Tools
Mortgage Calculator
Calculate your monthly mortgage payment and total cost. Everything runs in your browser — your data never leaves your device.
Loan Calculator
Enter your loan amount, annual interest rate, and term to instantly calculate your monthly payment and total cost.
Car Loan Calculator
Enter vehicle price, down payment, trade-in value, interest rate, and loan term to calculate your monthly payment.
Compound Interest Calculator
Calculate how your investment grows with compound interest.
Paycheck Calculator
Enter your gross pay and tax rates to calculate your net take-home pay and annual deductions.
Tip Calculator
Enter your bill, choose a tip percentage, and split the total among your group.
Inflation Calculator
Enter an amount, annual inflation rate, and number of years to see how inflation erodes purchasing power.
Investment Calculator
Enter your investment details to see how your money grows over time.
Tax Calculator
Enter your gross income, any deductions, and your tax rate to estimate your tax liability.
Retirement Calculator
Enter your age, savings, monthly contribution, and expected return to project your retirement nest egg.
Amortization Calculator
Enter your loan amount, interest rate, and term to see monthly payments and a full payment-by-payment breakdown.
Mortgage Payment Calculator
Calculate your monthly mortgage payment including principal, interest, taxes, insurance, and PMI.
401k Calculator
Project your 401k balance at retirement based on your salary, contributions, employer match, and investment returns.
Sales Tax Calculator
Calculate the tax amount and total price from a pre-tax price, or find the pre-tax price from a total using reverse mode.
Salary to Hourly Calculator
Enter your annual salary, hours per week, and working weeks per year to see your equivalent hourly, daily, weekly, and monthly rates.
Health Tools
BMI Calculator
Calculate your Body Mass Index in metric or imperial units. Everything runs in your browser — your data never leaves your device.
TDEE Calculator
Find your Total Daily Energy Expenditure — the number of calories you burn each day based on your body and activity level.
Pace Calculator
Enter your distance and finish time to calculate your pace per km, pace per mile, and running speed.
Text Tools
Word Counter
Paste or type your text below to instantly count words, characters, sentences, paragraphs, and estimate reading time.
Morse Code Translator
Switch between encoding text to Morse code and decoding Morse code back to text. Words are separated by slashes (/).
Character Counter
Paste or type your text below to see live statistics.
Generators
Random Number Generator
Set a range and how many numbers to generate, then click the button. All results are generated locally in your browser.
QR Code Generator
Type any URL or text below to instantly generate a QR code. Everything runs in your browser — nothing is uploaded.
Random Word Generator
Generate random words for creative writing, vocabulary building, and brainstorming.
Barcode Generator
Type any text or number to instantly generate a Code 128 barcode. Everything runs in your browser — nothing is uploaded. Download as PNG.
Education Tools
Grade Calculator
Enter your grades and optional weights to calculate your weighted average. Leave weights blank for a simple average.
GPA Calculator
Add your courses with credit hours and letter grades to calculate your cumulative GPA on the 4.0 scale.
Final Grade Calculator
Find out what score you need on your final exam to reach your target grade.
Network Tools
Math Tools
Percentage Calculator
Three common percentage calculations in one place.
Concrete Calculator
Enter your slab dimensions to calculate the volume of concrete needed.
Derivative Calculator
Enter a polynomial expression to compute its derivative using the power rule. Supports sums and differences of terms like 3x^2 + 2x - 5.
Standard Deviation Calculator
Enter a list of numbers to instantly compute mean, standard deviation (population and sample), variance, min, max, range, sum, and count.
Quadratic Formula Calculator
Solve ax² + bx + c = 0. Enter the coefficients to find the roots instantly.
Slope Calculator
Enter two points to calculate the slope (rise over run), y-intercept, line equation, and distance between the points.
Triangle Calculator
Enter all three side lengths to calculate area, perimeter, angles, and triangle type.
Square Root Calculator
Enter a number to calculate its square root, cube root, square, and cube.
Factor Calculator
Enter a whole number to find all its factors and its prime factorization.
Percentage Increase Calculator
Enter the original and new values to calculate the percentage change, absolute difference, and multiplication factor.
Z-Score Calculator
Enter a value, the population mean, and standard deviation to calculate the z-score and percentile rank.
Long Division Calculator
Enter a dividend and divisor to see the full step-by-step long division with quotient and remainder.
Right Triangle Calculator
Enter any two sides to calculate the third side, all angles, area, and perimeter of a right triangle.
Square Footage Calculator
Enter the length and width in feet to calculate the area in square feet, square meters, square yards, and square inches.
Percent Change Calculator
Enter the original value and the new value to calculate the percentage change.
Pythagorean Theorem Calculator
Enter any two sides of a right triangle to solve for the third using a² + b² = c².
Temperature Converters
Length Converters
Meters to Feet
Enter a length in meters to convert it to feet and inches.
Inches to Feet
Enter a value in inches to convert it to feet and inches.
Centimeters to Inches
Convert between centimeters and inches. 1 inch = 2.54 cm exactly.
Feet to Meters
Convert between feet and meters. 1 foot = 0.3048 meters exactly.
Kilometers to Miles
Convert between kilometers and miles instantly. 1 km = 0.621371 miles.
Feet to Inches
Convert between feet and inches instantly. 1 foot = 12 inches.
Millimeters to Inches
Convert between millimeters and inches instantly. 1 inch = 25.4 mm.
Time Tools
Time Calculator
Add or subtract two time durations in hours, minutes, and seconds.
Age Calculator
Enter your date of birth to calculate your exact age.
Date Calculator
Find the difference between two dates in years, months, and days, or calculate a future/past date by adding or subtracting days.
Time Card Calculator
Enter your clock-in and clock-out times for each shift. The total hours worked is calculated automatically.
Time Clock Calculator
Enter your clock-in and clock-out times to calculate total hours worked, overtime, and gross pay.
Time Zone Converter
Select a date, time, and source time zone to instantly see the equivalent time in any other time zone.
Security Tools
Lookup Tools
Weight Converters
Grams to Ounces
Convert between grams and ounces instantly. 1 ounce = 28.3495 grams.
Kilograms to Pounds
Convert between kilograms and pounds instantly. 1 kg = 2.20462 lbs.
Ounces to Pounds
Convert between ounces and pounds instantly. 1 pound = 16 ounces.
Ounces to Grams
Convert between ounces and grams. 1 ounce = 28.3495 grams.
Productivity Tools
Games
Developer Tools
JSON Formatter
Paste your JSON to format (prettify) or minify it. Errors are highlighted instantly.
Binary to Decimal Converter
Enter a binary number to convert to decimal, hexadecimal, and octal — or enter a decimal number to convert to binary.
Hex to Decimal Converter
Enter a hex number to convert to decimal, binary, and octal — or enter a decimal to convert back to hex.