Solve inverse-proportion problems instantly. Enter three values and find the missing fourth.
Handles cases where quantities move in opposite directions
Step-by-step display of the formula and arithmetic
Choose 0 – 10 decimal places for the result
Optional labels (hours, workers, km/h) for clarity
If 5 people take 8 days, how long will 10 people need?
Doubling your speed halves the journey time — confirm the exact figure
When a gas is compressed its pressure rises inversely
Food, fuel, or materials lasting fewer days when consumption increases
Calculator
Basic calculator for mathematical operations
Average Calculator
Calculate the average of a set of numbers
Area Calculator
Calculate area and perimeter for 9 shapes — rectangle, circle, triangle, trapezoid, ellipse & more
GST Calculator
Calculate GST, add or remove tax from prices
Unit Converter
Convert between different units of measurement
Percentage Calculator
Calculate percentages and percentage changes