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 value tables, trace x-values, and adjust the graph window directly in your browser.
Equation Solver
Choose a one-variable polynomial workflow or build a coefficient system with 2–8 variables and a transparent matrix-solving method.
Polynomial Solver
Enter coefficients for a polynomial of degree 1 to 10 and calculate real or complex roots numerically.
Matrix & Vector Calculator
Build or paste flexible matrices, then calculate arithmetic, row reduction, inverse, rank, cofactors, adjugate, 2×2 eigenvalues, and A·x = b systems.
Statistics Calculator
Analyse raw data, frequency pairs, or X/Y pairs using descriptive statistics, quartiles, standard deviation, and linear regression.
SCIENTIFIC & ENGINEERING TOOLS
Scientific & engineering tools
Scientific Calculator
Calculate trigonometry, roots, logs, combinations, factorials, integer functions, scientific notation, and reusable variables in a compact workspace.
Unit Converter
Convert engineering, science, and everyday units through 17 flexible categories, with pre-filled shareable URLs for exact conversions.
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 program, inspect feasible corner points, and calculate a maximum or minimum objective value in a transparent browser workspace.
DC Circuit Analysis Lab
Use transparent ideal-circuit calculations for resistors, voltage division, RC transients, and a two-node nodal-analysis model.
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
Compare cost and selling price to calculate profit or loss amount, percentage on cost, and selling-price margin.
Simple Interest Calculator
Use principal, annual rate, and years to calculate simple interest and final amount in a clear result panel.
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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