Rekenmachines voor studenten

Bereken studie kaart beoordeling sessies.

Bereken cursus video playback uren.

Bereken klaslokaal hand-out pagina's.

Bereken studie wekelijks goal percentage.

Bereken klaslokaal transition extra gegevens.

Bereken student laboratorium werkbank behoefte.

Bereken klaslokaal aanwezigheid capaciteit.

Bereken lezen pagina's per studie sessie.

Bereken training module voltooiing.

Bereken les plan bereiding uren.

Bereken frequentie table relatief aantal.

Bereken conditional waarschijnlijkheid given gebeurtenis.

Bereken regelmatig icosagon binnen hoek.

Bereken regelmatig veelhoek buiten hoek.

Bereken circular annulus oppervlakte difference.

Bereken parabola concentratie afstand.

Bereken ellips latus rectum lengte.

Bereken cirkel external tangent lengte.

Bereken interkwartiel bereik uit quartiles.

Bereken coëfficiënt van bereik statistic.

Bereken poisson zero gebeurtenissen waarschijnlijkheid.

Bereken triangle centroid mediaan afstand.

Bereken klaslokaal zitplaats vulling percentage.

Bereken onderwijs contact uur verhouding.

Heron Triangle Area Calculator uses triangle side a and triangle side b to calculate unit². All three sides must obey the triangle inequality.

Triangle Circumradius from Sides Calculator uses side a and side b to calculate length units. A degenerate triangle has no finite circumcircle radius.

Parabola Vertex X Coordinate Calculator uses quadratic coefficient a and linear coefficient b to calculate x units. Requires nonzero a; the x coordinate alone does not give the vertex height.

Regular Octagon Area Calculator uses octagon side length to calculate unit². Only applies to a regular eight-sided polygon.

Rectangular Prism Diagonal Calculator uses prism length and prism width to calculate length units. Inputs must be measured along mutually perpendicular edges.

Isosceles Triangle Height Calculator uses equal side length and base length to calculate length units. The base must be shorter than twice either equal side.

Triangular Prism Surface Area Calculator uses base side a and base side b to calculate unit². Assumes a right prism with congruent triangular ends; exclude material thickness.

Hollow Sphere Volume Calculator uses outer sphere radius and inner cavity radius to calculate unit³. Uses concentric inner and outer spherical boundaries.

Circular Segment Sagitta Calculator uses circle radius and chord length to calculate length units. Sagitta is the minor segment height; it is not an arc length.

3D Scalar Triple Product Calculator uses vector a x and vector a y to calculate unit³. The signed value is determinant A dot (B cross C); absolute value gives parallelepiped volume.

2×2 Odds Ratio Calculator uses exposed with outcome and exposed without outcome to calculate odds ratio. Zero-cell corrections and confidence intervals require additional modeling.

Positive Likelihood Ratio Calculator uses sensitivity percent and specificity percent to calculate ratio. Derived from sensitivity and specificity; not an individual prediction.

Storyboard Panel Workload Calculator estimates hours using storyboard panels, minutes per panel. Revision, approval, and final illustration are not included unless added to time per panel.

Label Roll Production Time Calculator estimates hours using required labels, printing rate (labels/min). Machine interruptions, roll changes and rejected labels add time.

Editorial Approval Queue Hours Calculator estimates hours using pending pieces, average reviewer minutes per piece. Revisions and cross-team bottlenecks may substantially increase elapsed turnaround.

Social Post Batch Workload Calculator estimates hours using posts to prepare, production minutes per post. Research, rights clearance, editing and analytics should be included in average time.

Video Publishing Backlog Days Calculator estimates days using ready-to-publish videos, videos published each day. A variable publishing schedule or rejected videos changes this planning estimate.

Transcript Typing Workload Calculator estimates hours using transcript word count, verified typing speed (words/min). Listening pauses, corrections and speaker attribution significantly increase real time.

Exam Question Time Budget Calculator estimates minutes/question using total answering time (minutes), questions to answer. Difficulty, marking weight and review time may justify unequal allocation.

Workshop Station Rotation Calculator estimates minutes/station using available workshop minutes, activity stations. Transition, setup and facilitator explanation time are excluded.

Conference Room Seat Demand Calculator estimates seats/room using expected attendees, concurrent rooms. Attendance may not split evenly; fire and venue occupancy rules must be respected.

Event Badge Printing Time Calculator estimates hours using badges to print, badges per minute. Artwork alignment, jams, supplies and reprints increase the schedule.

Flashcard Daily Review Target Calculator estimates cards/day using cards requiring review, days available. Spaced repetition requires reviewing previous material, not just new cards.

Presentation Slide Rehearsal Time Calculator estimates hours using presentation slides, practice run-throughs, seconds per slide. Questions, transitions and pauses add time to actual event delivery.

Classroom Worksheet Print Count Calculator estimates pages using students, pages per worksheet, sets per student. Duplex printing changes sheets used, but not the number of printed page faces.

Event Check-In Time Calculator estimates minutes using expected arrivals, average check-in seconds, check-in stations. Queues and arrivals in bursts can require extra staff beyond the mean estimate.

Weekly Lesson Preparation Hours Calculator estimates hours using lessons to prepare, preparation minutes per lesson. New material, differentiated instruction and feedback may increase average preparation time.

Plan the minimum pages to read each day to complete a book by a chosen number of reading days.

Estimate weeks to complete a course based on the number of lessons and weekly learning time.

Plan the number of study topics to review each day before a fixed deadline.

Estimate total reading hours from the number of textbook pages and realistic minutes spent per page.

Calculate how many listening days are required to finish remaining audiobook minutes with a daily listening target.

Estimate revision workload from lecture note page count and an observed review pace.

Calculate the break minutes in a study plan with a fixed number of work blocks and a break after each except the last.

Estimate total between-session changeover time for an event with several consecutive sessions.

Calculate the volunteer-hours needed to staff a given number of service stations over an event duration.

Estimate the number of full study sessions possible from a planned weekly time budget and session length.

Find how long a video or training lesson will take to play at a different speed.

Estimate the elapsed batch processing time when images are processed in parallel worker slots.

Find the nth term and finite sum of an arithmetic sequence with a constant difference.

Calculate a term and finite sum in a mathematical geometric sequence with a constant ratio.

Calculate a real integer-degree root, with domain checks for negative values and even roots.

Calculate the real cube root of positive, zero, or negative numbers.

Find the normalized remainder from division for cycle, modular arithmetic, and number theory problems.

Calculate the geometric mean of positive values and compare it with their arithmetic mean.

Calculate the harmonic mean of positive numerical values for suitable rate and ratio problems.

Calculate a trimmed mean by removing a chosen percentage of observations from both tails.

Flag possible low and high outliers using Tukey fences based on the interquartile range.

Estimate a normal-approximation confidence interval around a sample mean from its spread and sample size.

Calculate an ellipse area from its semi-major and semi-minor axes, with a perimeter approximation.

Calculate rhombus area from the lengths of its two diagonals.

Calculate the area of a standard kite from its perpendicular diagonal lengths.

Calculate area, perimeter, and apothem for a convex regular polygon from side count and side length.

Calculate prism volume from base area and perpendicular height.

Find a requested nearest-rank percentile from a list of numeric observations.

Calculate the population coefficient of variation from a numeric data set with a positive mean.

Estimate a simple proportion margin of error from sample size, assumed proportion, and a critical z value.

Calculate the driven-to-driver gear ratio and ideal output speed from tooth counts and input RPM.

Convert a repeating signal frequency to its period, or a period to frequency, using reciprocal relationships.

Bereken hoeveel een percentage van een bedrag of hoeveelheid is.

Bereken de procentuele stijging of daling tussen een oude en een nieuwe waarde.

Calculate the percentage-point difference between two percentages and the relative percentage change.

Calculate the first quartile, third quartile, and interquartile range of a numeric data set.

Bereken het gemiddelde, de mediaan, de modus, de spreiding, de som en het aantal van een reeks getallen.

Add, subtract, multiply, and divide fractions with step-by-step simplification.

Simplify ratios, scale ratios, and solve ratio proportions.

Calculate your Grade Point Average from course grades and credit hours.

Calculate your final grade from weighted assignments, exams, and projects.

Calculate percentage error and absolute error between observed and reference values.

Calculate population or sample standard deviation, variance, mean, sum, and count.

Calculate simple event probability from favorable outcomes and total outcomes.

Calculate the z-score of a value using its mean and standard deviation.

Full scientific calculator with trigonometry, logarithms, exponents, and more.

Convert a number to normalized scientific notation.

Solve a quadratic equation and calculate its discriminant and real roots.

Find the hypotenuse of a right triangle from the two perpendicular sides.

Calculate triangle perimeter and area from three side lengths.

Calculate the area of a rectangle, circle, or triangle.

Calculate the volume of a rectangular box, cylinder, or sphere.

Calculate the slope between two points on a line.

Calculate straight-line distance between two points on a coordinate plane.

Round a number to a selected number of decimal places.

Find the positive factors of a positive integer.

Check if a number is prime, and find all prime numbers up to any limit.

Calculate population or sample variance from a list of numeric observations and inspect the mean used.

Estimate the standard error of a sample mean from sample standard deviation and sample size.

Measure the average absolute distance of data values from their arithmetic mean.

Work out the score required on a final assessment to reach a target overall grade, given the current grade and final weight.

Estimate reading time from a word count and a chosen reading pace, useful for articles, study notes, and drafts.

Calculate wave speed from frequency and wavelength for basic physics and classroom problems.

Calculate molar concentration from the amount of solute in moles and total solution volume in litres.

Update a prior probability with new evidence using Bayes’ theorem and supplied conditional probabilities.

Find the union, intersection and differences of two comma-separated sets, with duplicate values removed.

Add, subtract and multiply 2×2 matrices and calculate each determinant with transparent row and column inputs.

Add, subtract, multiply and divide complex numbers, and calculate their magnitudes from real and imaginary parts.

Estimate a y-value between two known points using linear interpolation and identify when the result is extrapolated.

Calculate the dot product, vector magnitudes and angle between two three-dimensional vectors.

Calculate the three-dimensional cross product vector and its magnitude using the right-hand-rule convention.

Estimate probability below, between or above two values for a normal distribution with a chosen mean and spread.

Find the midpoint and straight-line distance between two points on a Cartesian plane.

Calculate slope, y-intercept and the equation of the straight line through two distinct coordinate points.

Solve a triangle side from two side lengths and their included angle using the law of cosines.

Calculate the projection vector and scalar projection of one three-dimensional vector onto another.

Find the smaller angle between two non-zero three-dimensional vectors from their components.

Calculate population and sample covariance from two equally sized paired data series.

Calculate raw median absolute deviation and mean absolute deviation from the data median.

Compare observed category counts with expected counts and estimate the chi-square statistic, degrees of freedom and upper-tail p-value.

Compare two independent success proportions using a pooled z statistic and a two-sided normal approximation.

Calculate the probability of an exact number of successes when drawing from a finite population without replacement.

Estimate the sample size needed to estimate a population mean for a stated standard deviation, margin of error and confidence z-score.

Calculate a Wilson score confidence interval for a proportion from observed successes and total observations.

Calculate the finite population correction factor for simple random sampling without replacement.

Compare observed and predicted numeric sequences using root mean square error, mean squared error and count of observations.

Calculate mean absolute percentage error from aligned observed and predicted values.

Calculate focal length and optical power from positive object and real-image distances using the thin-lens relation.

Calculate centripetal acceleration and force for a body moving along a circular path at a stated speed.

Calculate a paired-samples t statistic, degrees of freedom and two-sided p-value from sample summary statistics.

Compare two independent sample means with Welch’s t-test without assuming equal population variances.

Calculate Pearson’s chi-square statistic and an asymptotic p-value for a 2 by 2 contingency table.

Estimate standardized mean difference using the pooled sample standard deviation of two independent groups.

Calculate Spearman’s rank correlation from two matched numeric series, including average ranks for tied values.

Square a Pearson correlation coefficient to calculate R-squared for a simple linear relationship with an intercept.

Calculate adjusted Fisher–Pearson sample skewness from a list of numeric observations.

Calculate adjusted sample excess kurtosis to describe tail weight relative to a normal distribution.

Calculate sensitivity, specificity, predictive values and total sample count from confusion-matrix counts.

Calculate precision, recall and F1 score from true-positive, false-positive and false-negative counts.

Estimate chance-corrected agreement between two raters from a 2 by 2 agreement table.

Calculate each interior angle and the angle sum of a regular polygon from its number of sides.

Estimate ellipse circumference using Ramanujan’s approximation from the semi-major and semi-minor axes.

Plan a realistic daily study workload from total study hours, available days and a preparation buffer.

Estimate the standard error of a sample mean from sample standard deviation and sample size.

Calculate the first quartile, third quartile and interquartile range from an entered numeric sample.

Calculate the exact probability of a specified number of successes in a fixed number of independent trials with constant success probability.

Calculate what percentage of a defined population is represented by a sample, and see the remaining population count.

Estimate per-variant sample size for a two-sided conversion-rate A/B test using a normal approximation, baseline rate and relative minimum detectable lift.

Calculate median, p95 and p99 latency estimates from a list of measured request durations in milliseconds.

Score one option against three criteria using explicit weights and show the weighted score and each criterion contribution.

Calculate gross and net words per minute and an accuracy estimate from a timed typing test.

Calculate current attendance and how many remaining sessions you need to attend to meet a target rate.

Calculate the angular magnification of a simple telescope from objective and eyepiece focal lengths.

Estimate the exit-pupil diameter from telescope aperture and magnification.

Convert a lens’s actual focal length into a 35 mm equivalent using the camera crop factor.

Calculate heat transferred from mass, specific heat capacity and temperature change.

Estimate a material’s specific heat capacity from supplied heat energy, mass and temperature change.

Estimate the continuity-corrected McNemar chi-square statistic and approximate p-value from discordant pairs in paired binary observations.

Calculate a Mann–Whitney U statistic and an approximate two-sided normal p-value from sample sizes and the rank sum for sample one.

Find the exact probability of a specified count and the cumulative probability up to that count under a Poisson model.

Compare an observed sample proportion with a user-specified null proportion using a normal-approximation z test.

Calculate Kendall tau-a from concordant and discordant pair counts to summarize monotonic rank association.

Estimate a predictor’s variance inflation factor from its R-squared when regressed on other predictors.

Estimate a prediction interval for one future observation from a mean, sample standard deviation, sample size and supplied critical t multiplier.

Estimate internal consistency from item count and average inter-item correlation, with assumptions made explicit.

Estimate a simple variance-components intraclass correlation from between-subject and within-subject variance.

Combine two sample standard deviations using degrees-of-freedom weighting.

Estimate the standard error of the difference between two independent sample means.

Compare an outcome risk between exposed and unexposed groups using a four-cell table.

Calculate the risk difference between two groups from event and non-event counts.

Calculate a standard-normal critical z value for a central confidence level.

Calculate Shannon entropy and effective category count from up to five nonnegative category weights.

Estimate the finite-sample Simpson diversity index from category counts.

Calculate an expected cell frequency under independence from its row, column and grand totals.

Calculate one Benjamini–Hochberg rank threshold from the number of tests, target FDR and p-value rank.