Math & statistics tools
Calculators, statistics, unit conversion and number crunching — instant results, no spreadsheet needed.
Adjacency Matrix Converter
Convert a graph between edge list, adjacency matrix, and incidence matrix — directed or undirected, weighted or not. Free, private, runs in your browser.
Age Calculator
Calculate your exact age from your date of birth — years, months and days, next birthday countdown and total days lived. Free, private, in-browser.
Normalize Audio Loudness
Level any audio file to a standard loudness (LUFS) right in your browser — -14 for Spotify/YouTube, -16 for podcasts. Runs locally, nothing is uploaded, free.
Bitwise Calculator
Bitwise calculator: AND, OR, XOR, NOT, shifts, rotates and popcount on 8–64-bit integers in binary, hex, octal or decimal. Free, private, in your browser.
Bollinger Bands calculator
Compute Bollinger Bands (SMA plus/minus standard deviations) for a price series, plus %B and bandwidth, in your browser. Free, private, no upload.
Free Online Calculator
Evaluate any arithmetic expression instantly in your browser. Supports +, −, ×, ÷, parentheses and functions. No sign-up, runs offline.
Cartesian Product Generator
Generate every combination across 2-4 lists (sizes x colors x materials) — or just count them. Paste spreadsheet cells, pick any separator, output lines, CSV, JSON.
Chi-square test
Run Pearson's chi-square test online: goodness-of-fit or contingency-table independence with statistic, df, p-value and Cramér's V. Free, in-browser, no upload.
CIDR Calculator
CIDR calculator: get network address, broadcast, netmask, wildcard, usable host range and host count for any IPv4 or IPv6 prefix. Free, private, in-browser.
Column Math
Element-wise math on two columns of numbers — add, subtract, multiply, or divide two lists row by row in your browser. Free, private, no sign-up.
CSV stats
Compute per-column count, distinct, min, max, mean and sum for a CSV, in your browser. Free, private, no upload.
Cumulative Sum Calculator
Get the running total (prefix sum) of a list of numbers in your browser, with optional running average, min, and max at each step. Free, private, no sign-up.
Descriptive statistics
Compute mean, median, mode, variance, standard deviation, quartiles, min and max for a list of numbers, in your browser. Free, private, no upload.
Frequency distribution
Build a character, byte, or n-gram frequency table from text or hex, with counts and percentages, ranked most to least frequent — in your browser. Nothing is uploaded.
Geometry Calculator
Geometry calculator for area, perimeter, surface area and volume — squares, triangles, circles, spheres, cylinders, cones and more. Free, private, in-browser.
Graph Algorithms
Run graph algorithms on your own edge list — BFS, DFS, Dijkstra shortest path, topological sort, and cycle detection. Free, private, in your browser.
MACD Calculator
Compute the MACD indicator from any price series — MACD line, signal line and histogram, with configurable 12/26/9 EMA periods. Free, private, in-browser.
Moving Average Calculator
Calculate simple, exponential and weighted moving averages (SMA, EMA, WMA) over any number series with your chosen window. Free, private, in-browser.
Outlier detector
Find outliers in a list of numbers using the z-score, modified z-score (MAD) and IQR (Tukey's fences) methods, in your browser. Free, private, no upload.
Percentage Calculator
Free percentage calculator: what is P% of X, what percent X is of Y, percent increase or decrease, and share of a total. Private, runs in your browser.
RSI calculator
Calculate Wilder's Relative Strength Index (RSI) from pasted closing prices with configurable period and overbought/oversold thresholds. Runs locally in your browser.
Unit Converter
Convert between units of length, mass, temperature, volume, area, speed, data size, and time — instantly in your browser. Names and symbols accepted. Nothing is uploaded.
Z-Score Normalize
Standardize a list of numbers with z-score, min-max, max-abs, or robust median/IQR scaling. Population or sample standard deviation, private and browser-local.