Tool category
Everyday calculators
Quick, dependable answers for percentages, dates, journeys and common projects. Every live tool includes a reviewed method, example and limitations.
Percentages Calculate a percentage of a number, percentage change, or percentage difference with the formula shown. Date difference Find the signed number of days, weeks and calendar span between two dates. Convert units Convert common metric and imperial units with full precision and readable results. Journey fuel cost Estimate fuel used and journey cost from distance, consumption and fuel price. Concrete volume Calculate concrete volume for a rectangular slab and add a practical waste allowance and bag estimate.
In the workshop
These tools are planned but deliberately not published or indexed until they pass the same quality review.
Time DurationDiscount CalculatorPaint Calculator