Awesome Calculators

Software and web services for numeric, financial, engineering, health, conversion, LLM-cost, and everyday calculations. The list covers traditional, notepad, scientific, graphing, computer-algebra, command-line, and built-in calculators. Each entry lists the supported platforms, the listed price (which may vary by region or tax), the license, and a source link when code is publicly available.

Applications that pass basic hands-on checks but need more evidence for a main-list recommendation are listed in Emerging Calculators.

Contents

• Traditional Calculators
• Notepad Calculators
• Scientific, Graphing, and Computer Algebra
• Command-Line Calculators
• Specialized Calculators
  • Engineering and Construction
  • Health and Fitness
  • Developer Tools
  • LLM Cost Calculators
  • Conversion
  • Collections and Other
• Built-in, Search, and Launcher Calculators

Traditional Calculators

• CalcTape - Shows interim results on a running tape, so you can go back and correct any number or operation. Web Windows macOS Android iOS iPadOS · Price: Free on the web; free on Android with an optional US$4.49 one-time purchase; US$3.99 one-time on iPhone and iPad · License: Proprietary.
• Calzy - Combines an everyday calculator with editable memory, history, unit conversion, and configurable layouts. iOS iPadOS watchOS visionOS · Price: US$1.99 one-time · License: Proprietary.
• GNOME Calculator - Includes basic, advanced, financial, programming, and conversion modes. Linux Linux Mobile · Price: Free · License: GPL-3.0-or-later · Source: GNOME GitLab.
• Google Calculator - Provides basic and scientific calculations, history, and unit conversion in Google's stock Android interface. Android · Price: Free · License: Proprietary.
• HiPER Scientific Calculator - Scientific calculator with symbolic operations, equations, calculus, graphing, units, and RPN. Android · Price: Free with advertising; US$5.99 one-time for Pro · License: Proprietary.
• KCalc - Has scientific, statistical, logic, numeral-system, precision, history, and result-stack modes. Linux · Price: Free · License: GPL-2.0-or-later · Source: KDE Invent.
• OpenCalc - Lightweight Android calculator with a scientific mode, history, and themes. Asks for no unnecessary permissions. Android · Price: Free · License: GPL-3.0-only · Source: GitHub.
• PCalc - Scientific calculator with hexadecimal, octal, and binary calculations, an optional RPN mode, parentheses, programmable functions, and a large set of unit conversions. macOS iOS iPadOS watchOS visionOS · Price: US$9.99 one-time for Mac or iPhone, iPad, Apple Watch, and Apple Vision · License: Proprietary.
• Qalculate! - Desktop and command-line calculator with symbolic algebra, units, currencies, uncertainty propagation, and arbitrary precision. Windows macOS Linux CLI · Price: Free · License: GPL-2.0-or-later · Source: GitHub.
• RealCalc - Recreates a classic handheld scientific calculator, with RPN, fractions, statistics, constants, unit conversions, programmer bases, history, and memories. Android · Price: Free; US$3.99 one-time for Plus · License: Proprietary.
• Samsung Calculator - Provides standard, scientific, history, and unit-conversion modes on supported Samsung devices. Android · Price: Free · License: Proprietary.
• SpeedCrunch - Evaluates high-precision expressions from the keyboard with history, variables, units, constants, and custom functions. Windows macOS Linux · Price: Free · License: GPL-2.0-only · Source: Bitbucket.
• Uno Calculator - Brings Windows Calculator's standard, scientific, programmer, date, and conversion modes to native and web platforms. Web Windows macOS Linux iOS Android · Price: Free · License: MIT · Source: GitHub.

Notepad Calculators

• Calca - Puts a text editor, values, symbolic equations, references, and Markdown notes together in one calculation document. Windows macOS iOS iPadOS · Price: US$9.99 one-time per platform · License: Proprietary.
• Calculo - Evaluates plain-language mathematics with variables, units, live currencies, reusable functions, templates, and graphs in synchronized notes. macOS iOS iPadOS · Price: Free for one saved note; 7-day trial, US$4.99/month, US$29.99/year, or US$69.99 one-time for Premium · License: Proprietary.
• Numbr - Mixes contextual notes with arithmetic, currencies, variables, line references, totals, and shareable calculation documents. Web Browser extension · Price: Free · License: No license specified · Source: GitHub.
• Numi - Lets you write calculations in plain language, with currencies, units, dates, variables, reusable tokens, and plugins in an editable notepad. Windows macOS Linux CLI · Price: Free with limits; US$29.99 one-time for unlimited notes and iCloud sync · License: Proprietary.
• NumPad - Unit calculator and converter covering more than 1,600 units, with currency conversion at current exchange rates and support for physics and programming calculations. Web Windows macOS Linux · Price: Free for three documents; US$29 one-time for Pro with unlimited documents and one year of sync · License: Proprietary.
• Parsify - Supports units, currencies, dates, variables, comments, and plugins in a text calculation editor, with extensibility and privacy as design goals. Windows macOS Linux · Price: Free for five-line documents; €30 one-time for Full · License: Proprietary.
• Soulver - Calculates natural-language expressions containing quantities, dates, currencies, variables, reusable lines, and subtotals. macOS iOS iPadOS · Price: 60-day trial; US$59 one-time · License: Proprietary.

Explore emerging calculators in this category.

Scientific, Graphing, and Computer Algebra

• Cantor - A single worksheet interface for Maxima, SageMath, GNU Octave, Python, R, Julia, Qalculate!, and other mathematical engines. Linux Windows · Price: Free · License: GPL-2.0-or-later · Source: KDE Invent.
• Desmos Graphing Calculator - Creates interactive 2D graphs with sliders, tables, regressions, distributions, and statistics. Web iOS Android · Price: Free · License: Proprietary.
• FriCAS - A computer algebra system for mathematical research and algorithm development, covering calculus operations such as integration and differentiation as well as abstract algebra. Windows macOS Linux · Price: Free · License: BSD-3-Clause · Source: GitHub.
• GeoGebra Calculator Suite - Integrates graphing, geometry, computer algebra, 3D, probability, and scientific calculators. Web Windows macOS Linux iOS Android · Price: Free for non-commercial use; commercial licensing by quote · License: EUPL-1.2 source code with additional product terms · Source: GitHub.
• GNU Octave - A numerical-computing environment for linear and nonlinear mathematics, data analysis, 2D and 3D plotting, and simulation. Runs MATLAB scripts with little or no modification. Windows macOS Linux BSD CLI · Price: Free · License: GPL-3.0-or-later · Source: Mercurial.
• Graphing Calculator 3D - Plots Cartesian, polar, parametric, implicit, cylindrical, and spherical equations in two or three dimensions. Windows macOS Linux · Price: Free edition; US$199/year for Professional · License: Proprietary.
• KAlgebra - Performs numerical, logical, and symbolic calculations with 2D and 3D graphing, MathML support, and a console for evaluating expressions. Linux · Price: Free · License: GPL-2.0-or-later · Source: KDE Invent.
• Mathics3 - Implements a large subset of the Wolfram Language for symbolic mathematics in local, web, Python, and command-line interfaces. Web Windows macOS Linux Docker CLI · Price: Free · License: GPL-3.0-or-later · Source: GitHub.
• Mathway - Solves problems in basic mathematics, algebra, trigonometry, calculus, statistics, chemistry, and physics. Web iOS Android · Price: Free answers; US$9.99/month or US$39.99/year for step-by-step access · License: Proprietary.
• Maxima - Handles symbolic and numerical algebra, calculus, differential equations, matrices, arbitrary precision, and plotting. Windows macOS Linux CLI · Price: Free · License: GPL-2.0-or-later · Source: SourceForge.
• NumWorks Calculator - Solves equations and linear systems, graphs functions, computes statistics, and calculates probabilities from several distributions. Web Windows macOS Linux iOS Android · Price: Free · License: Proprietary source-available EULA.
• Photomath - Scans printed or handwritten problems and returns solutions, basic steps, and graphs, from elementary arithmetic to advanced calculus. Also includes a virtual tutor, video learning, and an advanced scientific calculator. Android iOS iPadOS · Price: Free basic tier; Plus in-app purchases from US$5.99 · License: Proprietary.
• REDUCE - Performs symbolic algebra, calculus, mathematical physics, and computations through domain-specific packages. Windows macOS Linux · Price: Free · License: BSD-2-Clause · Source: SourceForge.
• SageMath - Builds on open-source packages including NumPy, SciPy, Matplotlib, SymPy, Maxima, GAP, FLINT, and R, reachable through a common Python-based language or directly through interfaces and wrappers. Web Linux macOS Windows via WSL · Price: Free · License: GPL-2.0-or-later · Source: GitHub.
• Symbolab - Solves mathematics from algebra through calculus with graphing, practice, and optional step-by-step explanations. Web iOS Android · Price: Free core solver; US$9.95/month or US$39.95/year for Pro · License: Proprietary.
• Wolfram|Alpha - Computes answers across mathematics, science, units, and structured data from natural-language questions. Web macOS iOS Android · Price: Free basic tier; US$9.99/month or US$60/year for Pro · License: Proprietary.
• Xcas and Giac - Combines computer algebra with worksheets, spreadsheets, geometry, programming, and 2D or 3D graphing. Web Windows macOS Linux · Price: Free · License: GPL-3.0-or-later · Source: Official site.

Explore emerging calculators in this category.

Command-Line Calculators

• fend - Evaluates arbitrary-precision expressions with units, dates, currencies, complex numbers, and programmable functions. Web Windows macOS Linux CLI · Price: Free · License: MIT · Source: GitHub.
• GNU bc - An arbitrary-precision calculator with an input language similar to C. Works both as an interactive command-line tool and as a script processor. Linux macOS Unix CLI · Price: Free · License: GPL-3.0-or-later · Source: GNU archives.
• kalker - A scientific calculator that supports math-like syntax with user-defined variables, functions, differentiation, integration, and complex numbers. Web Windows macOS Linux Android CLI · Price: Free · License: MIT · Source: GitHub.
• Numbat - High-precision scientific calculator with support for physical units. Web Windows macOS Linux CLI · Price: Free · License: MIT or Apache-2.0 · Source: GitHub.

Specialized Calculators

Engineering and Construction

• BuildCalc - Calculates stairs, rafters, roofs, balusters, fences, materials, and cut lists for construction work. iOS iPadOS Android · Price: US$24.99 one-time · License: Proprietary.
• Calcpad - Combines engineering calculations, units, numerical methods, plots, reusable functions, and HTML-report generation. Web Windows Linux · Price: Free · License: MIT · Source: Codeberg.
• ClearCalcs - Provides structural-design calculations for timber, steel, concrete, masonry, loads, foundations, and frames across several standards. Web · Price: Free tier after a 14-day trial; US$1,490/year · License: Proprietary.
• Construction Master Pro - Handles feet-inch-fraction math, roofs, rafters, stairs, material quantities, areas, volumes, and job costs. iOS iPadOS Android · Price: 14-day trial; US$4.99/month or US$39.99/year · License: Proprietary.
• Pipe Flow Wizard - Calculates pressure loss, flow rate, pipe diameter, and pipe length for liquids and gases in a single length of pipe between a start and end elevation, with fittings to represent valves and bends. Windows macOS iOS iPadOS · Price: Trial; £95 one-time · License: Proprietary.
• SkyCiv Free Engineering Tools - Browser calculators for beams, trusses, frames, shafts, wind loads, foundations, base plates, inertia, and timber design. Web · Price: Free tools; optional paid platform · License: Proprietary.

Explore emerging calculators in this category.

Health and Fitness

• ACC CVD Risk Estimator Plus - Estimates ASCVD risk with Pooled Cohort and AHA PREVENT equations and explores potential therapy effects. Web US · Price: Free · License: Proprietary.
• Calculate by QxMD - Provides more than 400 evidence-based medical calculators and clinical decision-support tools. Web iOS iPadOS Android · Price: Free · License: Proprietary.
• CDC BMI Calculators - Official adult and child BMI calculators, with BMI-for-age guidance. Web US · Price: Free · License: Proprietary.
• Concept2 Training Calculators - Converts pace, watts, distance, VO₂ max, and weight adjustment for rowing, skiing, and cycling ergometers. Web · Price: Free · License: Proprietary.
• MDCalc - Collects physician-authored point-of-care equations, clinical scores, guidelines, and decision tools. Web iOS iPadOS Android · Price: Free · License: Proprietary.
• NHS BMI Calculator - Interprets adult and child BMI, with guidance that takes account of age, sex, activity level, and ethnicity where relevant. Web UK · Price: Free · License: Proprietary.
• NHS Heart Age Calculator - Compares heart age with chronological age for eligible adults and suggests ways to reduce risk. Web UK · Price: Free · License: GPL-3.0 · Source: GitHub.
• NIDDK Body Weight Planner - Models how changes in calories and physical activity affect the time needed to reach and maintain an adult weight goal. Web · Price: Free · License: Proprietary.
• PediTools - Provides pediatric growth, bilirubin, gestational-age, parenteral-nutrition, blood-pressure, and critical-care calculators. Web US · Price: Free · License: Proprietary.

Explore emerging calculators in this category.

Developer Tools

• cryptii - Chains numeral-base, character-encoding, cipher, hash, bitwise, and byte transformations in the browser. Web · Price: Free · License: MIT · Source: GitHub.
• CyberChef - Composes hundreds of encoding, compression, cryptographic, hashing, bitwise, and numeric operations client-side. Web Self-hosted · Price: Free · License: Apache-2.0 · Source: GitHub.
• DevToys - Offline base and date converters, encoders, hashes, checksums, formatters, generators, and testers in one application. Windows macOS Linux · Price: Free · License: MIT · Source: GitHub.
• Hexa - Keeps hexadecimal, decimal, octal, and binary values in sync and handles bitwise calculations, all from the menu bar. macOS · Price: Free · License: MIT · Source: GitHub.

LLM Cost Calculators

• Artificial Analysis LLM Price Calculator - Compares models using input, response, reasoning-token, and API-call volumes with token-based, word-based, and preset workloads. Web · Price: Free · License: Proprietary.
• Bifrost LLM Cost Calculator - Calculates costs for hundreds of models across chat, image generation, audio transcription, embeddings, and other billed modes. Web · Price: Free · License: Proprietary.
• DocsBot LLM API Pricing Calculator - Estimates per-request or monthly costs and compares chat, audio, and embedding models using input, output, and cached-token workloads. Web · Price: Free · License: Proprietary.
• Helicone LLM API Pricing Calculator - Compares input and output costs across more than 300 models and multiple API providers. Web · Price: Free · License: Apache-2.0 · Source: GitHub.

Explore emerging calculators in this category.

Conversion

• Convert for Windows - Converts units across many categories and supports user-defined conversions in a lightweight desktop interface. Windows · Price: Freeware · License: Proprietary.
• ConvertAll - Converts arbitrary compound units instead of limiting calculations to predefined category pairs. Web Windows Linux Android · Price: Free · License: GPL-2.0 · Source: GitHub.
• Converter NOW - Ad-free unit and currency converter with a privacy-focused design, in native and web builds. Web Windows Linux Android · Price: Free · License: GPL-3.0-only · Source: GitHub.
• GNU Units - Converts between thousands of unit systems and evaluates compound units and expressions. Windows macOS Linux CLI · Price: Free · License: GPL-3.0-or-later · Source: GNU archives.
• OANDA Currency Converter - Converts between 212 currencies using current or historical average bid and ask rates. Web iOS iPadOS · Price: Free · License: Proprietary.
• Unitto - Unit converter and calculator, with an Android application and an experimental web build. Web Android · Price: Free · License: GPL-3.0-only · Source: GitHub.

Explore emerging calculators in this category.

Collections and Other

• Calculator.net - Collects roughly 200 in-house calculators across finance, health, mathematics, statistics, construction, dates, and conversions. Web · Price: Free with advertising · License: Proprietary.
• Libre Calculator - Collects about 70 calculators for math, finance, health, cooking, and construction, each showing the steps behind its answer with a diagram and a short lesson. Web Windows macOS Linux · Price: Free · License: MIT · Source: GitHub.
• Omni Calculator - Organizes nearly 3,900 expert-reviewed calculators across science, finance, health, construction, conversion, sports, and everyday life. Web Android · Price: Free · License: Proprietary.
• PhotoPills - Plans photography with exposure, depth-of-field, field-of-view, timelapse, star-trail, spot-stars, and celestial-position calculators. iOS iPadOS Android · Price: US$10.99 one-time · License: Proprietary.
• timeanddate.com Calculators - Handles dates, durations, business days, time zones, meetings, week numbers, astronomy, and distances with documented edge cases. Web · Price: Free with advertising · License: Proprietary.

Explore emerging calculators in this category.

Built-in, Search, and Launcher Calculators

• Alfred - Evaluates basic and advanced expressions in its macOS launcher; open Alfred and type an expression, optionally prefixed with =. macOS · Price: Free calculator; optional paid Powerpack · License: Proprietary.
• Apple Calculator and Math Notes - Includes basic, scientific, conversion, variables, handwritten Math Notes, and 2D or 3D graphing modes; open Calculator and select a mode. macOS iOS iPadOS · Price: Included · License: Proprietary.
• Apple Spotlight - Evaluates expressions and converts currencies, temperatures, measurements, and times; press Command-Space and type the calculation. macOS · Price: Included · License: Proprietary.
• Bing - Answers arithmetic, polynomial, graphing, geometry, currency, and unit queries; enter an expression or search for calculator. Web · Price: Free · License: Proprietary.
• DuckDuckGo Instant Answers - Returns arithmetic and conversion results above regular search results; type the expression directly into DuckDuckGo. Web · Price: Free · License: Proprietary.
• Flow Launcher - Evaluates expressions and copies results from an extensible Windows launcher; open Flow Launcher and type the expression. Windows · Price: Free · License: MIT · Source: GitHub.
• Google Search Calculator - Evaluates arithmetic, scientific functions, constants, conversions, geometry, and graphs; type an equation into Google Search. Web · Price: Free · License: Proprietary.
• PowerToys Command Palette and Run - Provides expression, unit, date, time, hash, and value plugins; press Win-Alt-Space for Command Palette or Alt-Space and prefix an expression with = in Run. Windows · Price: Free · License: MIT · Source: GitHub.
• Raycast - Understands expressions, units, currencies, time zones, dates, percentages, ratios, and colors; open Raycast and type the calculation. macOS Windows iOS · Price: Free calculator; Pro from US$8/month billed annually · License: Proprietary.
• Windows Calculator - Includes standard, scientific, graphing, programmer, date, unit, and currency modes; search Start for Calculator. Windows · Price: Included · License: MIT · Source: GitHub.

Contributing

Read the contribution guidelines before submitting an application.

Footnotes

• Health, financial, tax, and engineering calculators are informational tools, not professional advice. Check each application's assumptions and applicable rules.
• Applications that are no longer maintained but still reachable are listed in unmaintained.md, as the Awesome guidelines require.
• An independent successor to xxczaki/awesome-calculators, with credit to the original. Its CC0 entries were re-checked rather than copied over wholesale.