# Scientific Calculator

> A free scientific calculator that works offline: fractions, trigonometry, logarithms, 102 formulas and 59 constants, a unit converter, a graph, a solver, finance, statistics, matrices and complex numbers, and a history of past calculations, exported as text or CSV. Nothing leaves your browser.

A static web app (no account, no server, no tracking): everything is calculated in the browser. Installable as an app on iOS, Android and desktop. Also available as a Chrome extension.

## Links
- [Calculator](https://raad.dev/calculator/): the app, with options and a guide to every function
- [For schools and organizations](https://raad.dev/calculator/admin): turning features of the Chrome extension off for students, from the Google Admin Console
- [Source code and documentation](https://github.com/raad-altaie/scientific-calculator): README, tests, AGPL-3.0 license

## Facts
- Precision: about 15 significant digits (IEEE 754 doubles), shown to 13.
- Angle units: degrees, radians, gradians. Fraction mode. Fix, Sci and Eng formats.
- Panels: formulas and constants; unit converter, with days between dates, dates moved on and Unix timestamps; graph (functions, sliders, roots and crossings, areas, derivatives, equations and inequalities of x and y, polar and parametric curves, recursive and explicit sequences, slope fields with their solutions, best fits); solver (roots of equations in exact form as well, inequalities, turning points, polynomials, linear systems, two curves, integrals, sums to infinity, limits, Taylor series, areas between curves, arc lengths, differential equations, time value of money (N, I/Y, PV, PMT, FV), NPV, IRR and payback, loan payment schedules, savings growth, APR and APY, bond price and yield, depreciation, break-even, inflation, percentage change and markup, normal, t, chi-squared, F, binomial, Poisson, geometric, hypergeometric, exponential and uniform distributions, confidence intervals); statistics (mean, median, quartiles, standard deviation, variance, mode, histogram and box plot; pairs with their line of best fit and correlation); numbers (matrices up to 10 × 10 with eigenvalues, powers, row reduction, null space, LU and QR, least squares, pasted from a spreadsheet or as [1 2; 3 4], an example on each card; vectors; complex numbers in polar and exponential form, polynomials of them, AC impedance of R, L and C; bases and bits up to 128 with byte order, any base from 2 to 36, text and Unicode codes, Base32, Base58, Base64 and Base85, hashes (MD5, SHA-1, SHA-256, SHA-512, CRC-32), UUIDs (version 4 and 7, and read), IPv4 and IPv6 subnets (CIDR), IEEE 754; prime factors, GCD and LCM, modular arithmetic, the Chinese remainder theorem, exact big numbers, primes, fractions and repeating decimals).
- Author: Raad Altaie. License: AGPL-3.0.