Free calculators

General calculators

Percentages, ratios, dates, time and everyday maths.

Guides for running the business

15 calculators

Percentage Calculator

Works percentages, where the base and the wording decide the answer..

Percentage Increase Calculator

Works a percentage increase, where the base is the original value..

Percentage Decrease Calculator

Works a percentage decrease, where reversing it needs a different percentage..

Ratio Calculator

Works ratios, where the parts and the whole are different questions..

Fraction Calculator

Works fraction arithmetic, where the operation decides whether denominators matter..

Average Calculator

Works averages, where the mean and the median tell different stories..

Age Calculator

Works an age, where whole units rather than elapsed time is the convention..

Days Between Dates

Counts days between dates, where inclusive and exclusive differ by one..

Date Calculator

Adds or subtracts from a date, where month arithmetic is ambiguous..

Hours Calculator

Totals hours, where decimal hours and hours and minutes are different formats..

Time Calculator

Adds and subtracts times, where the base is sixty rather than ten..

Speed Calculator

Works speed, where the units have to be consistent before dividing..

Distance Calculator

Works distance from speed and time, where the speed has to be the average..

Pace Calculator

Works pace, which is the reciprocal of speed and moves the opposite way..

Fuel Cost Calculator

Works fuel cost for a journey, where real consumption differs from the rating..

Beyond the numbers

Tools that produce something you can send

Invoice Generator

Build a clean, itemised invoice and print it to PDF.

Open tool

Estimate Generator

Turn a scope of work into a priced estimate the customer can approve.

Open tool

Work Order Generator

Write the job down before the technician leaves: what, where, who, and what they need to take with them..

Open tool

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