16 ready tools

Calculators

Everyday numbers, clearly calculated.

Calculate percentages, values and percentage change.

Calculate the final price and savings.

Add a tax rate or extract it from a total.

Calculate age at a chosen Gregorian date.

Calculate an interval or add days to a date.

Compare profit, margin and markup.

Split an amount equally or by weights while preserving the total in minor currency units.

Compare prices of compatible quantities using exact fractions, with explicit US and Imperial gallons.

Estimate constant-power device consumption and cost at an explicit manual tariff.

Estimate trip fuel and cost with explicit efficiency and volume units.

Calculate mean, median and spread, with exact variance and distinct sample and population models.

Calculate time, distance or pace from the other two with explicit units.

Calculate areas, perimeters and volumes for defined shapes in one tool, rejecting invalid triangles.

Calculate exact fractional break-even and the first whole-unit volume without loss for one product, with explicit zero and negative margin outcomes.

Model an initial amount and fixed periodic deposits at a constant nominal rate while retaining exact balances between periods.

Calculate a theoretical payment and minor-unit monthly schedule with an adjusted final payment and explicit payment timing.