Complex Number (i) Calculator
Perform complex number arithmetic — add, subtract, multiply, divide, raise to powers via De Moivre, find modulus, argument, polar form, and conjugate.
Free General Math Calculators
17 toolsMathematical concepts, functions, and applied math calculators. Browse our free general math tools below — no sign-up required.
Galileo's Paradox of Infinity Explorer
Explore Galileo's paradox interactively — compare counting numbers with perfect squares, visualize bijections, and understand infinite set cardinality.
Hilbert's Hotel Paradox Simulator
Simulate Hilbert's Hotel thought experiment — accommodate new guests in a fully-occupied infinite hotel and explore cardinal arithmetic interactively.
Luhn Algorithm Calculator
Validate credit card numbers, IMEI codes, and other IDs using the Luhn checksum algorithm. Generate check digits with step-by-step visualization.
Mayan Numeral Calculator
Convert between decimal and Mayan vigesimal (base-20) numeral system. See dots-and-bars glyphs, Long Count notation, and place-value breakdowns.
Miracle Probability Calculator
Calculate the probability of "miraculous" events — birthday paradox, lottery odds, coincidence probability, and Littlewood's Law of Miracles.
One's Complement Calculator
Convert between decimal and one's complement binary representation. View bit flipping, sign detection, range tables, and comparison with two's complement.
Pi (π) Explorer & Calculator
Explore pi — view digits, approximate with Leibniz/Machin/Monte Carlo methods, calculate circle area, circumference, and annulus area interactively.
Polish Notation Converter & RPN Evaluator
Convert between infix, prefix (Polish), and postfix (Reverse Polish) notation. Evaluate RPN expressions with step-by-step stack traces.
Potato Paradox Calculator
Explore the Potato Paradox — see how 100 kg of 99% water potatoes become 50 kg at 98% water. Generalize with any weight and water percentage.
Prisoner's Dilemma Calculator & Strategy Simulator
Explore the Prisoner's Dilemma — payoff matrices, Nash equilibrium, iterated games with Tit-for-Tat, Grim Trigger, Pavlov, and more strategies.
RSA Encryption Demo Calculator
Explore RSA encryption with small primes — generate keys, encrypt and decrypt messages, see modular exponentiation step by step.
Scatter Plot & Regression Calculator
Plot data points, compute Pearson correlation, linear regression, R², residuals, standard error, and outlier detection interactively.
Set-Builder Notation Converter & Set Operations Calculator
Convert between set-builder and roster notation, perform union/intersection/difference, test membership, and explore set theory interactively.
Significant Figures Calculator
Count significant figures in any number, round to N sig figs, and perform arithmetic with proper significant figure rules. Digit-by-digit analysis.
Subset & Power Set Calculator
Generate all subsets (power set) of a set, count by size with C(n,k), view binary encodings, and solve subset-sum problems interactively.
Two's Complement Calculator
Convert between decimal and two's complement binary for 8, 16, 32, 64-bit widths. View hex, octal, range, overflow detection, and arithmetic operations.