We are working on building a calculator for every computation life throws at you - from the serious to the whimsical.
Compute your class attendance percentage and find how many sessions you can miss or must attend to meet a target.
Plan how many pages to read each week so your book club finishes together on time.
Identify the century and millennium for any BCE or CE year with a simple calculation.
Calculate weekly study hours needed to prepare for a professional certification exam by your target date.
Create book citations in Chicago style with author, title, city, publisher, and year.
Factor a positive-definite matrix into L and L^T using the Cholesky method.
Estimate your potential payout from a class action settlement after attorney fees using this simple calculator.
Track classroom library book loans with automatic due dates.
Generate randomized or alphabetical seating arrangements for classroom management.
Estimate total classroom supply costs per student and for the entire class.
Compute the coefficient of variation for a list of numbers to understand their relative dispersion.
Calculate Cohen's d effect size from two independent sample means and standard deviations.
A tool to visualize colors as seen by individuals with common color vision deficiencies. Includes educational material on color blindness and accessibility considerations.
Estimate how many random draws it takes to collect all coupon types in the classic probability puzzle.
Determine the cousin relationship between two relatives based on their generational distance from a common ancestor.
Break down course material into a manageable schedule. Enter modules, weeks, and available study hours to plan your curriculum pace.
Compute the digital root of any number by repeatedly summing its digits until one digit remains.
Approximate solutions to first-order differential equations using Euler's method.
Compute Fibonacci numbers and view sequences to study the famous recurrence.
Estimate total and per-student costs for school field trips.
Quickly calculate the score you need on your final exam to achieve your desired overall grade. Enter your current grade, final exam weight, and desired grade.
Calculate flag height and area from width and aspect ratio or compute the ratio from given dimensions.
Estimate how your memory of flashcards fades over time and plan optimal review intervals.
Compute a truncated Fourier series for a function on [-π, π] to study periodic behavior.
Estimate the chance a gambler reaches a target fortune before going broke using the gambler's ruin model.
Compute Gershgorin discs for a square matrix to estimate eigenvalue locations.
Curve exam scores using the classical z-score method to reach a desired average and spread.
Estimate a college graduation date using credits required, credits completed, and average term load.
Generate the Gram matrix for up to four vectors and explore inner products in linear algebra.
Perform the Gram-Schmidt process on a set of 2D or 3D vectors to obtain an orthonormal basis.
Estimate your current and future h-index using citation counts and projected citation growth.
Analyze the syllable count of each line in your haiku to ensure it follows the traditional 5-7-5 structure.
Construct a cubic Hermite interpolant through two points with specified derivatives.
Compute the discrete Hilbert transform of a sequence to build an analytic signal and study amplitude and phase.
Find the calendar date for any numbered anniversary of a past event.
Translate historical country names into their modern equivalents for clear classroom communication.
Compute the length of historical eras in years, accounting for BCE and CE transitions.
Compare two historical events to determine if and how long they overlapped in time.
Convert a span of years and a desired physical length into a classroom timeline scale and tick marks.
Estimate the total time needed for homework and breaks so you can organize evenings efficiently.
Compute the check digit for ISBN-10 or ISBN-13 numbers.
Approximate solutions of 2x2 or 3x3 linear systems using the Jacobi iterative algorithm.
Evaluate the Jacobi symbol (a/n) for odd n using an efficient recursive algorithm.
Convert dates between the Julian and Gregorian calendars. Useful for historians and anyone working with historical documents.
Cluster two-dimensional points using the k-means algorithm. Specify data and number of clusters to obtain centroids and assignments.
Create a customized safety checklist for classroom science experiments.
Estimate your current proficiency and how long it may take to reach the next level based on study hours and language difficulty.
Compute the Laplace transform of basic functions to study differential equations and control systems.
Estimate shelving requirements from book counts, average thickness, and shelf dimensions.
Estimate the largest Lyapunov exponent of the logistic map to study chaotic behavior.
Estimate how long your machine learning model will take to train based on dataset size, epochs, and time per sample.
Convert a measured distance on a map to the actual ground distance using a map scale ratio. Ideal for geography students and hikers.
Compute the stationary distribution of a small Markov chain using iterative multiplication.
Compute the matrix exponential of a 2x2 matrix using a power series.
Estimate how many items you can store in a memory palace using rooms and mental imagery. Explore tips for improving recall and organizing loci effectively.
Generate book citations in MLA format for student bibliographies.
Compute the multiplicative inverse of an integer modulo m using the extended Euclidean algorithm.
Factor a non-negative matrix into two smaller non-negative matrices using multiplicative updates and view the reconstruction error.
Compute surface area and volume of an oblate spheroid using equatorial and polar radii.
Compute the odds ratio between two groups using a 2x2 contingency table and evaluate association strength.
Estimate your likelihood of finishing an online course based on study hours and dropout probability. Plan your schedule for success.
Calculate percent increase or decrease between two values. Ideal for tracking price changes, discounts, and other comparisons.
Find the percentile rank of a value within a set of numbers to gauge its relative standing.
Calculate the probability of observing a given number of events using the Poisson distribution. Useful for physics, biology, and reliability engineering.
Rate a historical document on multiple criteria to compute an overall reliability score.
Compare the long-term costs of sending a child to public or private school. Include tuition, taxes, transportation, and opportunity cost to determine the most affordable education path.
Estimate the radius of convergence of a power series from its coefficients.
Analyze your writing with our Readability Score Calculator. Paste any text to instantly see Flesch-Kincaid scores and learn how to improve clarity for your audience.
Translate a total SAT score to an equivalent ACT composite or vice versa using concordance tables.
Track your daily scripture reading progress and estimate how long it will take to finish your chosen text.
Approximate a root of a function using the secant iteration method.
Estimate your expected improvement during an immersion program by entering study hours, weeks abroad, and starting ability.
Estimate how many hours it will take to research and write a sermon based on length and study habits.
Calculate the length of a shadow cast by an object based on its height and the sun's elevation angle.
Solve 2-variable linear programs using the simplex method.
Compute Simpson's diversity index from species counts to assess ecological diversity.
Determine required concrete slab thickness for interior wheel loads using Westergaard's equations and subgrade modulus.
Calculate the density of any small social network to see how connected members are. Useful for sociology students analyzing group cohesion.
Compute solid angle in steradians from area and radius or cone angle. Learn how solid angles describe fields of view, radiation patterns, and celestial objects.
Create an efficient study plan using spaced repetition. Enter days until your exam and topics to get a suggested review schedule.
Create randomized spelling quizzes from custom word lists.
Compute volume, surface area, and base radius of a spherical cap from sphere radius and cap height.
Convert between Cartesian and spherical coordinates for points in three dimensions.
Check whether a categorical syllogism is valid based on proposition types and figure.
Analyze any passage with a Flesch Reading Ease and Flesch–Kincaid Grade Level calculator to gauge how difficult it is to read.
Compute the volume of a triangular prism by entering base dimensions and length. Useful for aquariums, roof trusses, and packaging.
Perform a two-sample t-test to determine if two independent groups have significantly different means.
Easily convert units of length, weight, volume, and temperature with this versatile unit converter tool. Ideal for everyday tasks and quick engineering references.
Estimate student engagement in online classes using camera time, contributions, and poll participation.
Estimate vocabulary retention based on time since study and daily retention rate.
Find your overall class grade by entering scores and their percentage weights. Useful for students tracking progress throughout a semester.
Paste text to see how often each word appears and explore vocabulary distributions.
Calculate how long it will take to finish a writing project based on target word count, session output, and days per week.
Compute the z-score of a value and estimate its percentile relative to a normal distribution.