Education calculators
Free education and statistics calculators: volume of a cylinder, mixed fractions, vertex form, matrix inverse and determinant, stem and leaf plots, Punnett squares, dilution, average and standard deviation, z-scores and percentiles, class and module grades, high school GPA and final exam scores, AP score predictors, percentile rank, 30–60–90 triangles, box plots and five-number summaries, degrees of freedom, linear interpolation, graduation year and NDA age eligibility.
High School GPA Calculator: Weighted & Unweighted
Calculate high school GPA by course and credits. Compare weighted and unweighted grades, add previous credits and plan the GPA you need next.
Volume of a Cylinder Calculator
Find the volume of a cylinder from radius or diameter and height, or solve for height or radius from a volume. Includes surface area, gallons and liters.
Mixed Fraction Calculator
Add, subtract, multiply and divide mixed numbers and fractions with steps, e.g. 2/3 × 2 1/2 = 1 2/3 and 2/3 ÷ 3/4 = 8/9. Simplified answers and decimals.
Punnett Square Calculator
Build a monohybrid, dihybrid (4x4) or trihybrid Punnett square with X-linked and incomplete dominance options, plus genotype and phenotype ratios.
Dilution Calculator: Percent & Molar
C1V1 = C2V2 dilution calculator for molar, mg/mL, % w/v, v/v and w/w, plus 1:10 dilution ratios, serial dilutions and mass to weigh.
Average and Standard Deviation Calculator
Find the mean and sample or population standard deviation with step-by-step working. Frequency tables supported; adds variance, CV, standard error and a chart.
Z-Score to Percentile Calculator
Convert a z-score to a percentile, find z from a value, get left, right, between and two-tailed probabilities, go in reverse, and use a full z-table.
30-60-90 Triangle Calculator & Formula
Solve a 30-60-90 triangle from any side, area, perimeter, altitude or radius. Exact radical and decimal answers, a to-scale diagram, proofs and practice.
Percentile Rank Calculator
Find a score's percentile rank from your data by mid-rank, at-or-below, strictly-below or Excel rules, or the value at any percentile (NIST or Excel).
AP Seminar Score Calculator
Estimate your AP Seminar score from every rubric row of the IRR, TMP, IWA, presentations and exam, using College Board 2026-27 weights.
AP Statistics Score Calculator
Estimate your AP Statistics exam score using the May 2027 format. See multiple-choice and FRQ contributions, practice examples and score assumptions.
Age Calculator of NDA: NDA Age Limit & Eligibility
Check if you are eligible for NDA (I) or NDA (II) by date of birth. Shows the allowed birth-date window, your exact age and which exam cycles you can apply for.
AP US History Score Calculator (APUSH)
Estimate your AP US History score (1–5) from multiple choice, short answers, DBQ and LEQ points, weighted exactly like the College Board exam.
AP World History Score Calculator
Estimate your AP World History: Modern score from multiple choice, SAQ, DBQ and LEQ points, using the official section weights and 2026 score data.
AP Chemistry Score Calculator
Predict your AP Chemistry score from 60 multiple-choice answers and 7 free-response questions, weighted 50/50 as in the College Board exam.
AP Biology Score Calculator
Predict your AP Biology score from multiple choice and the six free-response questions, with official weights and the latest 2026 score distribution.
AP Physics 1 Score Calculator
Estimate your AP Physics 1 score from multiple choice and the four redesigned free-response questions, with 2027 format changes explained.
AP English Language Score Calculator
Estimate your AP English Language and Composition score from 45 multiple-choice answers and three essays scored 0–6, using official section weights.
Mechanical Advantage Calculator (IMA, AMA)
Calculate ideal and actual mechanical advantage and efficiency for levers, pulleys, wheel and axle, inclined planes, wedges and screws, with formulas.
Grade Calculator: Test Score, Weighted & Final
Calculate test grades, weighted module grades and credit-weighted averages. Plan unfinished assessments or the score you need on your final.
Graduation Year Calculator
What year will you graduate high school? Find the class of year from a birth date and state kindergarten cutoff or from a grade, or when a class started high school.
Linear Interpolation Calculator
Linear interpolation calculator: find y between two points, interpolate from a pasted table, extrapolate or do bilinear 2D interpolation, with formula and chart.
Box Plot Maker & Five-Number Summary Calculator
Paste data to make a box and whisker plot. Get min, Q1, median, Q3, max, IQR, 1.5×IQR fences, outliers and the mean, with three quartile methods.
Degrees of Freedom Calculator
How to calculate degrees of freedom for one-sample, paired, pooled and Welch t-tests, chi-square goodness of fit and independence, ANOVA and regression.
Stem and Leaf Plot Maker
Make a stem and leaf plot from any data set, with split stems, back-to-back plots, decimals and a key, plus median, mode, range and quartiles.
Vertex Form Calculator (Quadratic Standard ↔ Vertex)
Convert a quadratic from standard form to vertex form by completing the square, or back. Get the vertex, axis of symmetry, roots and a graph with steps.
Matrix Inverse Calculator (2×2, 3×3, 4×4)
Find the inverse of a 2×2, 3×3 or 4×4 matrix with fractions and steps, plus its determinant, transpose and adjugate. Check A × A⁻¹ = I.