Practical tools, made to explore
Free interactive utilities for calculations, everyday questions, and learning—designed to help you try ideas, see results, and understand what they mean.
Online Standard Calculator
A versatile online calculator that allows you to run multiple instances at once. Perform basic arithmetic, compare results side-by-side, and handle independent calculations with ease.
Online Scientific Calculator
A comprehensive online scientific calculator featuring trigonometric (including hyperbolic), logarithmic, exponential, and root functions. Supports degree/radian modes and scientific notation. Ideal for students, engineers, and professionals.
Fraction Calculator
Add, subtract, multiply, and divide between two fractions with detailed step-by-step solutions.
Common Denominator Calculator
Find the common denominator and convert fractions to equivalent forms.
Fraction Simplifier
Free online Fraction Simplifier. Enter numerator and denominator to instantly reduce fractions to their simplest form with step-by-step explanations.
Greatest Common Factor Calculator
Calculate the Greatest Common Factor (GCF) of two or more numbers with step-by-step solutions.
Square Root Calculator
Calculate the square root of any positive number with detailed results including perfect square detection and simplified radical forms.
Single Variable Equation Calculator
Instantly solve linear, quadratic, and cubic equations. Get solutions with exact and decimal results.
Cube Root Calculator
Calculate the cube root of any number with detailed results including perfect cube detection and support for negative numbers.
Least Common Multiple Calculator
Calculate the Least Common Multiple (LCM) of two or more numbers with step-by-step solutions.
Prime Factorization Calculator
Find the prime factorization of any positive integer with step-by-step visualization and factor tree.
System of Linear Equations Calculator
Easily solve systems of linear equations with 2 or 3 variables. Obtain both exact and decimal solutions instantly.
Pythagorean Theorem Calculator
Calculate the missing side of a right triangle using the Pythagorean theorem. Supports irrational numbers with radical and decimal display.
Polynomial Factorization Calculator
Instantly factor polynomials into irreducible components. Supports integer and rational coefficients.
Trigonometry Calculator
Instantly calculate sine, cosine, tangent, and their inverses. Switch seamlessly between degrees and radians.
Inflation Calculator
Calculate how inflation impacts your purchasing power. Estimate future value or past costs using fixed inflation rates to understand the real worth of your money.
US Inflation Calculator
Calculate inflation-adjusted values in the US using CPI data from the U.S. Bureau of Labor Statistics.
IBAN Calculator
Generate and validate IBANs for various countries. Convert bank codes and account numbers to IBANs instantly.
Lottery Number Generator
Generate lottery numbers for Powerball, EuroMillions, and more. Use custom seeds for repeatable results and share your lucky picks.
Hours Calculator
Instantly calculate the duration in hours and minutes between two times. Supports calculations across multiple days for work shifts or event tracking.
Date Calculator
Add or subtract days, weeks, or months from a date and get the resulting date (with weekday) formatted for your locale.
Time Card Calculator
Track start/end times, breaks, and weekly work hours with an optional printable PDF report.
Date Time Calculator
Add or subtract years, months, weeks, days, hours, minutes, and seconds from a date and time. Shows the resulting date (with weekday) and time formatted for your locale.
Days Between Dates Calculator
Calculate how many days are between two dates, with an option to include the end date. See the result as days, or as weeks/months/years.
Days Until Calculator
Calculate the exact number of days remaining until any target date. Create a countdown for holidays, deadlines, or events, and view the time left in days, weeks, months, and years.
Age Calculator
Calculate your precise age in years, months, weeks, and days.
Days Since Calculator
Pick a date in the past to see how many complete calendar days have elapsed. Save meaningful dates and let their counters keep running.
Week Calculator
Calculate the exact number of weeks and days between any two dates.
Countdown Timer
Create a precise countdown to any date and time. Features custom display formats, shareable links, and local history tracking.
ROI Calculator
Calculate Return on Investment (ROI) and Annualized ROI to evaluate and compare investment performance.
Profit Margin Calculator
Calculate profit margin, markup, profit, and target revenue for pricing and product comparisons.
Amortization Calculator
Calculate your loan amortization schedule, view monthly payments, interest breakdown, and compare up to three loan scenarios.
APR to APY Calculator
Convert between APR and APY across monthly, semimonthly, bi-weekly, weekly, daily, quarterly, semiannual, and continuous compounding with step-by-step formulas.
Mortgage Calculator
Calculate your monthly mortgage payment, view a detailed amortization schedule, and see how extra payments can save you interest and time.
CD Calculator
Estimate certificate of deposit growth with APY or APR, review the core formulas, and compare pre-tax versus after-tax return.
Color Mixer
Mix colors visually with measuring cups. Pick colors, adjust amounts, and see the blended result in RGB, HSL, and HEX.
Encrypt / Decrypt Text
Encrypt or decrypt text with AES-256-GCM directly in your browser. No data leaves your device.
Dice Roller
Roll virtual dice with fancy animations. Choose classical 6-sided dice with a shaking cup or customize dice with any number of sides using a slot-machine effect.
Live Clipboard
Move text between your devices through a short-lived, real-time board.
Random Number Generator
Generate one or more random integers inside your chosen range with a satisfying rolling reveal animation.
Adult BMI Calculator
Calculate your adult BMI, understand the screening category, and track changes over time.
Pace Calculator
Calculate your running pace, finish time, or distance, then see what that pace could mean on race day.
Free Fall Calculator
Calculate distance, time, and velocity for objects in free fall under gravity. Features interactive animation and step-by-step solutions.
Vertical Launch Calculator
Calculate maximum height, time to peak, and total flight time for an object launched straight up under gravity. Includes interactive animation and step-by-step solutions.
Constant Acceleration Calculator
Solve 1D constant-acceleration motion problems for final velocity, displacement, time, or acceleration with worked steps and visual graphs.
Elastic Collision Calculator
Simulate 1D elastic collisions, compute final velocities, and verify conservation of momentum and kinetic energy with step-by-step math and interactive animation.
Average Calculator
Calculate arithmetic mean, median, mode, and weighted mean with step-by-step formulas.
Z-Score Calculator
Calculate a z-score from a raw value, mean, and standard deviation, with percentile and tail probability summaries.
Z-Score Probability Calculator
Find left-tail, right-tail, between, center, and two-tail probabilities for one or two standard normal z-scores.
Z Critical Value Calculator
Find z critical values from confidence level or alpha for left-tailed, right-tailed, and two-tailed tests.
T Critical Value Calculator
Find t critical values from confidence level or alpha, with degrees of freedom for left-tailed, right-tailed, and two-tailed tests.
Confidence Interval Calculator for a Mean
Estimate a population mean from a sample mean, standard deviation, sample size, and confidence level using z-score or t-score methods.
Confidence Interval Calculator for a Proportion
Estimate a population proportion from successes and sample size or from a sample proportion and sample size, with z-score critical values and step-by-step results.
Standard Deviation Calculator
Calculate population or sample standard deviation with step-by-step LaTeX solutions. Understand variance, Bessel's correction, and standard error.