Calculators that show their work
Instant, accurate answers for exam scores, statistics and money — with the conversion tables, formulas and sources visible, so you can trust the number you get.
Exam score calculators
- SAT Score Calculator Turn your digital SAT raw scores into a 400–1600 estimate based on official practice tests. →
- AP Calculus Score Calculator Estimate your AP Calc AB or BC score (1–5) from multiple choice and FRQ points. →
- TMUA Score Calculator Convert TMUA raw marks to the 1.0–9.0 scale using published conversion tables. →
- PSAT Score & National Merit Calculator Selection Index from your PSAT scores, with state Semifinalist cutoffs. →
- SAT Superscore Calculator Combine your best section scores across test dates into one superscore. →
- ACT Score Calculator Enhanced ACT raw scores to the 1–36 scale and your composite. →
- IB Grade Calculator Total your IB Diploma points out of 45, with the official TOK/EE matrix. →
- AMC 10/12 Score Calculator AMC score from correct, blank and wrong answers — with AIME cutoffs. →
Grades
Math & statistics
- Normal Distribution Calculator Probabilities, z-scores and percentiles with an interactive bell curve. →
- Five Number Summary Calculator Min, Q1, median, Q3, max and IQR from your data — TI-84 method. →
- Outlier Calculator Find outliers with the 1.5×IQR rule, fences included. →
- Residual & Regression Calculator Least-squares line, correlation r, and every residual from your data. →
- Binomial Distribution Calculator binompdf and binomcdf — exactly, at least, at most probabilities. →
- Geometric Distribution Calculator geometpdf and geometcdf — probability the first success comes on trial k. →
- Expected Value Calculator Mean and standard deviation of any discrete probability distribution. →
Writing tools
- Words to Pages Converter How many pages your word count fills — by spacing, font and size. →
- Reading Time Calculator How long a text takes to read at slow, average and fast speeds. →
- Character & Word Counter Live character, word and sentence counts — with limits for essays and social posts. →
- Words to Minutes (Speech Time) How long your speech or presentation runs at a real speaking pace. →