Education & learning tools
Grade math, memory science and practice drills — calculators for students, printables for teachers, and simulators for anyone curious how learning actually works.
Most popular
Final Grade Calculator
What do you need on the final exam to reach your target grade? Instant answer for any weight.
popular
GPA Calculator
Compute your GPA from course grades and credits — or ask what term GPA you need to hit a cumulative goal.
popular
Math Worksheet Generator
Printable worksheets: arithmetic, fractions, algebra, order of ops, decimals, mixed numbers and percents.
popular
Spaced Repetition Simulator
SM-2, FSRS, HLR, Leitner and Pimsleur side by side — workload, retention and knowledge per study hour.
Grades & Exams
Final Grade Calculator
What do you need on the final exam to reach your target grade? Instant answer for any weight.
popular
GPA Calculator
Compute your GPA from course grades and credits — or ask what term GPA you need to hit a cumulative goal.
Exam Pass Probability Calculator
How likely are you to pass a multiple-choice exam by guessing the rest? Supports ruling out options and per-section pass rules.
Grade Curve Calculator
Curve a class of scores, assign letter grades, compare methods side by side, and print or export a gradebook.
Memory & Learning Science
Spaced Repetition Simulator
SM-2, FSRS, HLR, Leitner and Pimsleur side by side — workload, retention and knowledge per study hour.
Flashcard Workload Planner
How many daily reviews will your Anki deck really cost — vacation strategies, easy days, exam pacing, SM-2 vs FSRS.
Forgetting Curve Visualizer
Ebbinghaus curve with a sweet-spot band — drag reviews early, on time, or late and watch the decay flatten.
Knowledge Tracing Simulator
Bayesian Knowledge Tracing live — each right / wrong answer shows the Bayes math in plain numbers.
Trainers & Quizzes
Geography Quiz
Flags, capitals and map click — world regions or a US states & territories pack.
Morse Code Trainer
Koch Morse by ear — weak-letter drill, pitch & noise, eyes-closed speak-back, session WAV download.
Periodic Table Quiz
Click the table, drag tiles, type-race the blank grid, or MC — with filters and a fact card after each answer.
Speed Reading Trainer (RSVP)
RSVP at 100–1000 WPM with live speed, rewind, real WPM history and dyslexia-friendly options.
Teacher Printables
About these tools
Everything here runs instantly and free: work out what you need on the final, compute your GPA, curve a class fairly, or estimate your odds on a multiple-choice exam. The learning-science simulators show the actual algorithms behind Anki, Duolingo and mastery-learning tutors, the trainers drill Morse code, the periodic table, flags and capitals with real game mechanics, and the printable generators produce fresh math worksheets and flashcards with answer keys — no signup, nothing stored.