Tools
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How to Use a Random Number Generator
Simple ways to use random numbers for selections, games, testing and demonstrations, plus an important security warning.
Read the guide →Useful answers, not just buttons
Our guides explain the ideas behind the tools in plain language, with examples you can actually follow. Use them when you want to understand the answer rather than simply get one.
How we approach these guides: they are written to help with the actual task in front of you. We use examples, point out common mistakes and explain where a simple calculator has limits. If you spot an error or something that needs clarification, please let us know through the Contact page.
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Calculations
Percentages, age, pricing and break-even planning.
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Digital tools
QR codes, barcodes, Base64 and file transfers.
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Everyday business
Invoices, margins, pricing and practical workflows.
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