Calcumber is a simple but powerful calculator. Perform everyday calculations with ease, or use variables and units for engineering and scientific calculations. Copy complete calculations to apps like Word, Writer, Excel, PowerPoint or Outlook, with an editable link.

Calcumber includes an interface to CoolProp for calculating the thermodynamic properties of water, air, and many refrigerants at specified conditions.

Calculating the weight of a US Letter page using Calcumber.

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Features

🌿 Naturally type expressions ➔ get immediate results

🔗 Copy and share ➔ keep calculations editable with a link

🧩 Variables and constants ➔ pi, e, G, mu0

📏 Real-world units ➔ 50 mph to km/h

🧪 Scientific functions ➔ sin, acos, log, round, and more

♨️ Thermodynamic fluid properties ➔ refrigeration, heat pumps, steam and air

💡 Installation optional ➔ run directly in your browser

The Calcumber Mascot

Calcumber mascot

Math is not dry stuff. It is juicy and crunchy, like a cucumber.

Cucumeris calculens — also known as the Calcumber — is the first known plant species to evolve a taste for numbers, variables, and units. Intelligent as Homo sapiens, but much friendlier and more peaceful, as long as you keep feeding it calculations.

Math Journal

Calcumber Math Journal is an Add-In for Microsoft Word: Type your expressions directly in your document and get the result immediately. Perfect for keeping problem, explanation, and solution together in one place.

Screenshot of Calcumber Math Journal

Calculation tool tightly integrated into Word, no app switching.

Math Journal is currently based on the MathJS math engine - it will be based on the Calcumber engine in the future.

More on Math Journal | Microsoft Marketplace

Alternatively, use Calcumber web app and paste the calculation into Word or any other app and keep it editable with a link — less integrated, but more responsive.

Last updated: 2026-05-19