External Links Collection

General calculators

Omni Calculator Omni Calculator is a hub of more than 3,700 online calculators covering mathematics, science, finance, health and everyday topics. Its mission is to “solve real‑life problems” by making complex calculations trivial and accessible.
Calculator.net Calculator.net provides a wide variety of free calculators across finance, fitness, health and mathematics, aiming to be a “one‑stop” site for quick calculations.
Calculator Soup Calculator Soup offers professionally designed calculators for loans, mortgages, time value of money, math, algebra, trigonometry, physics and statistics, often with formulas and step‑by‑step explanations.
Gigacalculator Gigacalculator focuses on everyday and professional calculators, including statistics, finance, health and math, with clear explanations and well‑chosen defaults.

Desmos Graphing Calculator Desmos offers a powerful online graphing calculator for plotting functions, exploring algebra interactively and visualising equations, widely used by teachers and students.
GeoGebra GeoGebra is a rich platform that combines dynamic geometry, algebra, calculus and statistics tools with a large library of classroom‑ready activities.
Symbolab Symbolab is an AI‑powered math solver that provides step‑by‑step solutions for algebra, calculus and many other topics, helping learners see how an answer is derived.
Wolfram Alpha Wolfram Alpha is a computational knowledge engine that answers questions by computing results from its curated data. It covers mathematics, science, finance, health, geography and more.
Mathway Mathway lets you enter algebra, calculus, statistics and other math problems and see instant solutions, with optional step‑by‑step workings for many question types.
Microsoft Math Solver Microsoft Math Solver accepts typed or handwritten math problems and provides solutions with explanations, graphs and related practice questions, especially helpful on mobile devices.

Calculators.org – Finance & Loan Tools Calculators.org aggregates many everyday calculators, with strong coverage of personal finance and loans as well as health, math and conversion tools.
MortgageCalculator.org – Mortgage Tools MortgageCalculator.org focuses on home‑loan and amortization calculators, making it easy to compare rates, terms and payment schedules for different scenarios.
TheCalculatorSite – Finance Calculators TheCalculatorSite offers clear finance calculators for savings, loans, currency conversions and more, with detailed explanations of each formula.
Dinkytown.net Financial Calculators Dinkytown.net specialises in white‑label financial calculators for banks and credit unions, but its public demos are also useful for exploring loan terms, savings plans and retirement scenarios.

GraphPad QuickCalcs GraphPad QuickCalcs offers quick interactive calculators for biostatistics, including t‑tests, chi‑square, correlation and sample size calculations, suitable for lab and research work.
Daniel Soper’s Statistics Calculators Daniel Soper’s collection of statistics calculators covers power analysis, regression, ANOVA, non‑parametric tests and more, aimed at students and researchers who need detailed outputs.
Stat Trek – Statistics Tutorials Stat Trek combines explanations of core statistics concepts with interactive calculators, making it easier to connect formulas, interpretation and worked examples.

Time and Date – Date Calculators Timeanddate.com offers calculators for date duration, adding or subtracting days, working with weekdays, time zone conversion and planning events across regions.
Time and Date – World Clock & Time Zones The world clock section of timeanddate.com helps you compare local time across cities, check time zone details and plan meetings internationally.
World Time Buddy World Time Buddy is a visual time zone planner that lets you drag and compare times across cities, ideal for scheduling remote meetings or online classes.

Convertworld Convertworld is a long‑running unit‑conversion site covering currencies, measurements and everyday units, available in many languages and suitable for quick lookups.
UnitConverters.net UnitConverters.net focuses on precise conversions for physics, engineering and everyday units, with large lists of supported quantities and clear formulas.
Metric Conversions Metric Conversions provides quick converters between metric and imperial units for temperature, length, volume, weight and many other measurements.
XE Currency Converter XE’s currency converter lets you check live mid‑market exchange rates and convert between most world currencies, with historical rate charts for context.

Khan Academy Khan Academy is a free learning platform with structured courses, practice problems and videos for math from early grades through calculus, plus science, computing and more.
Brilliant Brilliant offers interactive courses in math, data, computer science and physics, emphasising problem‑solving and visual intuition rather than rote memorisation.
MIT OpenCourseWare – Mathematics MIT OpenCourseWare publishes free course materials from many MIT mathematics classes, including lecture notes, assignments and exam problems.
Purplemath Purplemath provides approachable explanations and practice for algebra topics, with a focus on building intuition for students returning to math or preparing for exams.
Paul’s Online Math Notes Paul’s Online Math Notes is a widely used reference for algebra, calculus and differential equations, featuring detailed notes, worked examples and problem sets.

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