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THE LYNARA TOOL LIBRARY

Study tools, organized around your next step.

Calculate a grade, create a citation or plan your study time. Find the right tool by task, with no account required for local calculators.

97 practical toolsClear, task-based categories

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EXPLORE BY TOPICCategories

Calculator

Final Grade Calculator Calculate the score needed on a final exam, project your course grade, and see the reachable course-grade range from a 0% to 100% final. Open tool

Calculator

GPA Calculator Calculate a college GPA from letter grades and credit hours with an editable 4.0 scale, or enter grade points manually. Open tool

Calculator

Weighted Grade Calculator Calculate a weighted course grade from category scores and weights, even when the entered weights do not add to exactly 100%. Open tool

Calculator

Test Grade Calculator Calculate a test percentage, letter-grade reference and missed-question count from either correct or wrong answers and total questions. Open tool

Calculator

SAT Score Calculator Calculate an SAT total from section scores or estimate a score range from raw correct answers using the official 2026 Practice Test #11 conversion table. Open tool

Calculator

Grade Percentage Calculator Convert points earned and points possible into a percentage, letter grade and number of missed points. Open tool

Calculator

ACT Score Calculator Calculate the current ACT Composite from English, Math and Reading section scores, with an optional legacy four-section mode. Open tool

Teacher

Teacher Grader Generate a complete grading chart for any test length, showing correct answers, missed answers, percentage and letter-grade reference. Open tool

Calculator

Class Rank Percentile Calculator Convert a class rank and class size into top percentage, two common percentile conventions, decile and students above or below you. Open tool

Citation

APA Citation Generator Generate APA 7 reference-list entries for journals, webpages, books and chapters, plus a matching parenthetical in-text citation. Open tool

Citation

MLA Citation Generator Generate MLA Handbook 9th edition Works Cited entries and matching parenthetical in-text citations for journal articles, webpages, books and book chapters. Open tool

Citation

AMA Citation Generator Generate AMA 11 references for journal articles, webpages, books and chapters, with DOI import and PubMed/NLM journal-abbreviation checks. Open tool

Citation

Chicago Citation Generator Generate Chicago Manual of Style 18th edition bibliography or author-date references for journal articles, webpages, books and chapters. Open tool

Citation

IEEE Citation Generator Generate numbered IEEE references for journal articles, webpages, books and book chapters using current IEEE reference-guide conventions. Open tool

Citation

ACS Citation Generator Generate references using the current ACS Guide to Scholarly Communication for journal articles, webpages, books and book chapters. Open tool

Citation

CSE Citation Generator Generate CSE Manual 9th edition Citation-Sequence references for scientific journal articles, webpages, books and book chapters. Open tool

Citation

ASA Citation Generator Generate American Sociological Association 7th edition references for journal articles, webpages, books and book chapters. Open tool

Citation

Harvard Citation Generator Generate Harvard references and matching author-date in-text citations for journals, websites, books and chapters using a Cite Them Right-style variant. Open tool

Citation

Turabian Citation Generator Generate Turabian 9th edition bibliography or author-date references plus a matching full note or parenthetical citation for common academic sources. Open tool

Citation

Vancouver Citation Generator Generate Vancouver / NLM references for journal articles, websites, books and chapters using ICMJE guidance, NLM formatting and PubMed journal abbreviations. Open tool

Research utility

DOI Link Generator Normalize one DOI into a canonical doi.org link or extract unique DOI strings from pasted references and research text locally. Open tool

Research utility

ISBN Checker & Converter Validate ISBN-10 or ISBN-13 check digits and convert valid ISBN-10 to ISBN-13 or 978-prefixed ISBN-13 to ISBN-10 locally. Open tool

Research utility

Bibliography Duplicate Checker Check one-reference-per-line bibliography text for exact normalized duplicates while preserving the original reference text. Open tool

Research utility

Bibliography Alphabetizer Alphabetize one-reference-per-line bibliography text locally while preserving each citation line exactly as entered. Open tool

Calculator

Mean Median Mode Calculator Calculate mean, median, mode, minimum and maximum from a list of numeric values. Open tool

Calculator

Standard Deviation Calculator Calculate population and sample variance and standard deviation from a numeric data set. Open tool

Calculator

Five Number Summary & Outlier Calculator Calculate min, Q1, median, Q3, max, IQR, 1.5×IQR fences, box-plot whiskers and flagged outliers from numeric data. Open tool

Calculator

Percentile Rank Calculator Calculate the percentile rank of a target value within a numeric data set using a stated midrank convention. Open tool

Calculator

Coefficient of Variation Calculator Calculate population and sample coefficient of variation from a numeric data set with a nonzero mean. Open tool

Calculator

Pearson Correlation & Covariance Calculator Calculate Pearson r, r squared, sample covariance and population covariance from two paired numeric data sets. Open tool

Calculator

Simple Linear Regression & Prediction Calculator Fit a least-squares line, calculate slope, intercept, Pearson r and r squared, and optionally predict Y for a chosen X value. Open tool

Calculator

Z-Score & Normal Percentile Calculator Calculate a z-score from value, mean and standard deviation, plus normal-model percentile and right-tail probability. Open tool

Calculator

Standard Error Calculator Calculate the standard error of a sample mean from standard deviation and sample size. Open tool

Calculator

Mean Confidence Interval Calculator Calculate a normal-approximation confidence interval for a mean from the mean, standard deviation, sample size and confidence level. Open tool

Calculator

Margin of Error Calculator Calculate a normal-approximation margin of error for a proportion from sample size, estimated proportion and confidence level. Open tool

Calculator

Sample Size Calculator Estimate sample size for a proportion margin-of-error target, with optional finite-population correction for a known population. Open tool

Calculator

Grade Recovery Calculator Calculate the average grade needed across all remaining course weight to reach a target final course grade. Open tool

Calculator

Assignment Grade Impact Calculator Project how an assignment changes your accounted course average or calculate the assignment score needed for a target accounted grade. Open tool

Calculator

Drop Lowest Grade Calculator Calculate an equal-weight score average before and after dropping the lowest one or more scores from a list. Open tool

Calculator

Extra Credit Grade Calculator Calculate how bonus points change a points-based grade when extra-credit points are added to points earned without increasing points possible. Open tool

Calculator

Study Time Calculator Turn a total study-hour goal and days remaining into a daily study target, with optional buffer days before the deadline. Open tool

Calculator

Revision Schedule Calculator Split exam topics across usable revision days and estimate minutes per topic from days remaining, buffer days and planned study minutes. Open tool

Calculator

Course Workload Calculator Estimate weekly academic workload from course credits, your chosen study-hours-per-credit assumption and scheduled class hours. Open tool

Calculator

Semester Credit Load Calculator Calculate the average credits needed per remaining semester from credits left in a program and semesters remaining. Open tool

Calculator

Exam Time Per Question Calculator Calculate average time available per question after reserving review time from a fixed exam duration. Open tool

Calculator

Pages Per Day Calculator Calculate how many pages you need to read per day from total pages, pages already completed, days remaining and optional buffer days. Open tool

Calculator

Pomodoro Study Calculator Calculate total focus time, break time and session length from focus minutes, short breaks and number of study cycles. Open tool

Calculator

Flashcard Study Time Calculator Estimate flashcard review time from card count, seconds per card, review rounds and optional break time between rounds. Open tool

Calculator

Degree Progress Calculator Calculate credit completion percentage and credits remaining from earned credits and the total credits required for a degree or program. Open tool

Calculator

Attendance Percentage Calculator Calculate attendance percentage from classes attended and classes held, plus missed-class count. Open tool

Calculator

Absence Limit Calculator Calculate the maximum absences allowed by a minimum attendance percentage and how many absences remain under that threshold. Open tool

Calculator

Lecture Playback Time Calculator Calculate how long a recorded lecture, class or study video takes at a selected playback speed and how much time the speed change saves. Open tool

Calculator

Essay Word Budget Calculator Split an essay word target into introduction, conclusion and equal body-section budgets using editable percentages and section count. Open tool

Calculator

Writing Time Calculator Estimate writing time from a target word count, words already written and your own writing speed in words per minute. Open tool

Calculator

Words Per Page Calculator Estimate pages from word count or words from pages using editable font, font size, line spacing and US Letter margin assumptions. Open tool

Calculator

Presentation Time Calculator Estimate speaking time from script word count and speaking speed, or calculate a target word count from a presentation time limit. Open tool

Calculator

Presentation Slide Pace Calculator Calculate average speaking time per slide after reserving opening, closing or discussion time from a presentation limit. Open tool

Calculator

Reading Level Calculator Estimate English Flesch Reading Ease and Flesch-Kincaid-style grade level from words, sentences and heuristic syllable counts. Open tool

Calculator

Word Frequency Counter Count and rank repeated words in pasted text locally, with editable minimum word length and an option to ignore common English words. Open tool

Calculator

Reading Speed Calculator Calculate reading speed in words per minute from a known word count and the time it took to read the text. Open tool

Calculator

Word & Character Counter Count words, characters, sentences and paragraphs as you type, and track an optional assignment word range — privately in your browser. Open tool

Calculator

Reading Time Calculator Estimate reading time from a text word count and an editable reading speed in words per minute. Open tool

Calculator

Class Average & Grade Distribution Calculator Calculate class mean, median, standard deviation, A–F counts and percentages, plus pass/fail rate from score percentages. Open tool

Calculator

Grade Curve Calculator Apply a transparent grade-curve method to class score percentages and compare the original mean and top score with the curved results. Open tool

Calculator

Question Point Calculator Divide a test, quiz or assignment point total evenly across a number of questions and see whether the exact points per question is a whole number. Open tool

Calculator

Rubric Score Calculator Calculate a weighted rubric score from criterion points and weights, with normalized contributions plus strongest and weakest criteria. Open tool

Calculator

Classroom Group Size Calculator Split a class into a balanced number of groups from student count and preferred group size, showing the resulting small and large group sizes. Open tool

Calculator

Random Student Picker & Group Generator Paste a class roster to pick students at random with optional no-repeat mode or create balanced random groups entirely in your browser. Open tool

Calculator

Lesson Time Planner Divide a class period into opening, closing and equal activity blocks from total lesson minutes and number of activities. Open tool

Student file tool

Assignment Photos to PDF Combine photos or scans of handwritten work into one Letter or A4 PDF locally for assignment submission. Open tool

Student file tool

Assignment Image Compressor Reduce a JPG, PNG or WebP assignment image toward an upload-size target locally while keeping the result readable. Open tool

Student file tool

PDF Notes to Images Turn PDF notes, slides or reading pages into PNG or JPEG images locally for study, presentations or sharing selected pages. Open tool

Visual

Concept Map Maker Build a visual concept map in the browser from a central topic and connected concepts, with optional AI expansion planned behind the same tool. Open tool

Calculator

Weighted GPA Calculator Calculate a weighted GPA with per-course extra weight for honors, AP, IB or other advanced-course systems. Open tool

Calculator

Cumulative GPA Calculator Project an updated cumulative GPA or calculate the GPA needed across future credits to reach a target cumulative GPA. Open tool

Calculator

Semester Grade Calculator Calculate a semester grade from term or quarter grades using equal-term or custom syllabus weights, with an optional final exam. Open tool

Teacher

Spelling Test Generator Turn a custom word list into a clean numbered spelling test and teacher answer list without any AI cost. Open tool

Calculator

Assignment Deadline Planner Plan assignment tasks by days remaining or a real start/due-date range, with optional weekend exclusion, buffer days and daily time estimates. Open tool

Research utility

ISSN Checker Validate an ISSN check digit and normalize an eight-character serial identifier into standard XXXX-XXXX form. Open tool

Research utility

ORCID iD Checker Validate an ORCID iD check digit and normalize it into the standard four-group format with a canonical orcid.org URL. Open tool

Calculator

Attendance Projection Calculator Project your attendance percentage after planned future attended and missed classes. Open tool

Calculator

GPA Credits Needed Calculator Calculate how many future credits at an expected GPA would be needed to reach a target cumulative GPA. Open tool

Calculator

Grade Replacement Impact Calculator Compare a hypothetical GPA if an old course grade is replaced with a new grade versus if the repeat is counted as an additional attempt. Open tool

Calculator

Late Penalty Calculator Calculate a hypothetical late-work score using either percentage-points-per-day or percent-of-score-per-day penalties. Open tool

Calculator

Points Needed to Reach a Target Grade Calculate how many points are needed from remaining coursework to reach a target percentage in a points-based course. Open tool

Calculator

Study Days Between Dates Calculator Count inclusive study days between two dates with an option to exclude Saturdays and Sundays. Open tool

Calculator

Semester Progress Calculator Calculate how much of a semester date range has elapsed and how many calendar days remain. Open tool

Research utility

arXiv ID Checker & Link Generator Normalize modern or legacy arXiv identifiers and generate a canonical arxiv.org abstract link locally. Open tool

Calculator

Normal Distribution Calculator Calculate normal-distribution left-tail, right-tail and between-values probabilities, density, z-scores and inverse percentiles. Open tool

Calculator

Binomial Probability Calculator Calculate exact, at-most and at-least binomial probabilities from trials, successes and a fixed success probability. Open tool

Calculator

Poisson Distribution Calculator Calculate exact, at-most and at-least Poisson probabilities from an average event rate and an observed event count. Open tool

Calculator

Permutation & Combination Calculator Calculate exact nPr permutations and nCr combinations with or without repetition, using integer arithmetic instead of rounded factorial math. Open tool

Calculator

Classroom Seating Chart Generator Paste a class roster and generate a randomized row-and-column seating chart locally in your browser without uploading student names. Open tool

Calculator

T-Test Calculator Run one-sample, Welch two-sample or paired two-tailed t tests with t statistic, degrees of freedom and p-value. Open tool

Calculator

Chi-Square Test Calculator Run chi-square independence or goodness-of-fit calculations with expected counts, degrees of freedom and upper-tail p-value. Open tool

Calculator

P-Value Calculator Convert a z, t or chi-square test statistic into the matching one- or two-tailed p-value with explicit distribution assumptions. Open tool

Calculator

One-Way ANOVA Calculator Run a one-way ANOVA across 3 to 20 numeric groups with F statistic, degrees of freedom, p-value, sums of squares and eta squared. Open tool

For education sites

Embed a grade tool on your site

Use the free grade calculator widgets to add Final Grade, College GPA or Teacher Grader to a school, tutoring or study website with copy-ready iframe code and visible Lynara attribution.