ToolForage is a free library of online tools. It has 271 calculators and unit converters for finance, loans, investing, business, health, education, dates and times, maths, geometry, statistics, construction, gardening, energy, and print and media, plus 14 text tools and 17 developer tools.
Methods and examples
Each tool page shows the formula or method it uses, a worked example you can check against, and the assumptions that affect the result.
Privacy
Calculator inputs are processed in the browser and are not included in page URLs. See the privacy page for hosting and data details.
Limits
Results depend on the values entered and the stated assumptions. Financial scenarios are not forecasts, and material estimates are not structural designs.