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© 2024-2026 Debasish C Saha · qcalc.org

Calculate. Explore. Create. Share

Calculations are everywhere. Some are simple enough for a pocket calculator, while others involve formulas, units, data, charts, simulations, or specialized technical knowledge. Many useful calculations are too specific to justify building a complete application, so they end up being done repeatedly in spreadsheets, scripts, or by hand.

qCalc aims to provide a simpler way.

Use a calculator—or create your own

qCalc provides a growing collection of calculators covering business, family, engineering, finance, photography, everyday calculations, and many other areas.

But qCalc is not intended to be just a collection of predefined calculators.

With qCalc, you can create your own calculator using Python directly in your browser. Using its function to form capability, qCalc can automatically turn a Python function into a user-friendly calculator form, using the function's parameters to build the interface. You can check and validate your code, test it, and save the calculator for future use. qCalc automatically lets those calculations become building blocks for scenarios, comparisons, and simulations helping you move from calculation to decision.

You write the calculation; qCalc builds the interface— and gives you a place to explore what the calculation means.

This makes it possible to turn a calculation that might otherwise live in a spreadsheet or a small script into a reusable web-based tool.

Go beyond a single calculation

qCalc is more than a tool for producing a single result. Calculated results can become building blocks for further analysis. Use expressions to further evaluate results, compare alternatives, explore scenarios, run simulations, generate tables and charts, or combine calculations into more complex models.

qCalc lets you move from "What is the result?" to "What happens if...?"

From a calculator to a computational model

What starts as a simple calculator can become a small computational model. Process the calculated results further. Use the calculations to explore different assumptions and possibilities.

• Explore what-if scenarios
• Compare alternatives and assumptions
• Simulate uncertain outcomes
• Generate tables, charts, and projections
• Solve optimization problems
• Build more complex calculations from existing logic

qCalc is not only about calculating answers. It is about exploring, modeling, and understanding problems.

From personal calculations to shared tools

A calculator you find useful or create for yourself may also be useful to someone else.

qCalc is a platform where specialized calculators can be created, organized, used, and shared. The goal is to make it easier for people with some technical knowledge to turn their calculations into tools that others can use without needing to write code themselves.

Whether it is an engineering formula, a financial calculation, a photography tool, or a small utility for everyday work, qCalc provides a place to build it.

qCalc Philosophy

qCalc is built around a simple idea:

If a calculation is useful, it should be easy to turn it into a reusable tool.

We believe sophisticated computational capabilities should be accessible without requiring everyone to build a complete software application. AI makes it easier than ever to generate formulas, code, and answers through prompting. qCalc focuses on what comes next: turning that logic into something you can run, inspect, reuse, and explore.

A prompt can give you an answer. A qCalc calculator can give you a model you can run again, change, compare, and build upon.

qCalc is therefore designed to make calculations accessible, reusable, and practical—while providing a path for users to create tools of their own.

Free and open to everyone

qCalc is developed as a free-to-use web application, with the aim of making useful computational tools accessible to as many people as possible.

The project is continuously evolving, and the collection of calculators and capabilities will continue to grow.

Use a calculator. Create one. Make it useful to someone else.

Self-host qCalc

qCalc is also designed to be self-hosted.

Organizations and individuals can run their own qCalc installation, allowing them to create and use calculators within their own environment. This can be useful when calculators contain organization-specific formulas, procedures, standards, or other information that should remain private.

A self-hosted qCalc can provide the same calculator-building capabilities in a private environment, giving you control over your calculators, data, and deployment.

qCalc source code and self-hosting instructions are available on  Github

Contact

If you have any questions, feedback, or suggestions, please don't hesitate to reach out.

Thank you for your interest in qCalc.

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MIT License

Copyright (c) 2024-2026 Debasish C Saha

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.