About ToolPlug

What ToolPlug is

ToolPlug is a collection of free calculators, converters, and developer utilities for everyday tasks. The site is maintained as an independent web project.

Tools are grouped by topic so visitors can find a relevant calculator, enter their own values, and review the result. Some tools include a formula, worked example, or notes about their assumptions.

Accuracy and limitations

A calculator is only as useful as its inputs, formula, and assumptions. Results may be estimates and are not a substitute for professional financial, medical, legal, or engineering advice. Check the method shown on a tool and verify important decisions with an appropriate qualified professional.

We welcome specific corrections. Send the page address, the values entered, the result you expected, and a reliable reference for the correction. This makes it easier to investigate and improve the tool.

How to reach us

For tool corrections, accessibility issues, suggestions, or questions about this site, email [email protected].