FREE ONLINE CALCULATOR DIRECTORY
Find the right calculator for the problem.
Browse connected math, engineering, finance, and everyday calculators. Every tool works directly in the browser and links to useful next steps.MATH & ALGEBRA TOOLS
Math & algebra tools
Graphing Calculator
Plot and compare several functions, inspect tables and trace values, estimate x-intercepts and intersections, adjust the graph window, and use a clear online workflow for common graphing-calculator tasks.
Equation Solver
Use a clear online equation solver for one-variable equations and simultaneous linear systems. Enter coefficients, solve linear, quadratic, and cubic equations, or compare matrix methods for A·x = b systems.
Polynomial Solver
Enter polynomial coefficients from the highest power to the constant term, then calculate real and complex roots numerically with residual checks for degree 1 through 10 equations.
Matrix & Vector Calculator
Build or paste 2×2 through 10×10 matrices, then calculate arithmetic, row reduction, RREF, matrix rank, row-space clues, inverse, determinants, cofactors, adjugates, 2×2 eigenvalues, and A·x = b systems.
Statistics Calculator
Analyse raw data, frequency tables, grouped intervals, or paired X/Y values using descriptive statistics, sample and population standard deviation, variance, quartiles, IQR, outlier checks, and regression results.
SCIENTIFIC & ENGINEERING TOOLS
Scientific & engineering tools
Scientific Calculator
Evaluate trigonometry, roots, logarithms, powers, combinations, factorials, integer functions, reusable variables, constants, and normal, scientific, or engineering notation in one focused browser calculator.
Unit Converter
Convert 17 unit families with clear formulas, base-unit context, metric and imperial workflows, and shareable pre-filled conversion links for engineering, science, study, and everyday calculations.
RESEARCH & SIMULATION LABS
Research & simulation labs
Differential Equations Lab
Model first-order ODEs and two-state systems with controlled initial conditions, step sizes, solution curves, phase plots, and numerical tables.
Symbolic Algebra Lab
Simplify and differentiate expressions, evaluate a model at a chosen value, or compare two forms with a clearly labeled algebra-engine result.
Optimization Lab
Build a two-variable linear programming model, enter objective coefficients and constraints, inspect feasible corner points, and compare objective values to find a maximum or minimum result.
DC Circuit Analysis Lab
Calculate ideal DC resistor circuits with Ohm's law, resistor networks, voltage dividers, RC charge or discharge, and a two-node nodal-analysis solver that explains conductance matrices and current injections.
Advanced Statistics Lab
Use an inference-focused statistics workspace for t-tests, correlation, simple regression, and one-way ANOVA with visible assumptions.
EVERYDAY CALCULATORS
Everyday calculators
Percentage Calculator
Choose from ten percentage workflows including change, reverse calculations, selling-price markup, profit margin, and compound growth.
Distance Calculator
Find Euclidean distance and midpoint between two points, or calculate travel distance, speed, or time from the other two values.
Age Calculator
Enter a date of birth and calculate calendar age on today’s date or a selected reference date, with years, months, days, totals, and next-birthday timing.
BMI Calculator
Use adult height and weight measurements to calculate BMI as a screening measure. An optional age field confirms this adult-only tool is appropriate; it is not a diagnosis.
Profit, Loss & Margin Calculator
Enter cost price and selling price to calculate profit or loss amount, markup on cost, profit margin on revenue, and the difference between margin and markup.
Simple Interest Calculator
Use principal, annual rate, and time in years, months, or days to calculate simple interest, interest earned, final amount, and a clear formula breakdown.
Compound Interest Calculator
Project compound growth using a starting balance, annual rate, years, frequency, and optional regular contributions.
Loan Payment Calculator
Estimate an amortized payment, total repayment, and interest for a loan using a chosen payment frequency.
Discount & Tax Calculator
Calculate a discount amount, sale price, optional tax, and final price with a compact discount calculator.
21 live calculators and growing.
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