Percentages
Percentages
Calculators & Tools
Percentage Increase Calculator
Calculates percentage increase in three modes: find the new value after a percentage rise, find what percentage one value increased relative to another, or reverse-engineer the original value before a known percentage increase. Includes step-by-step working and edge-case warnings for zero and negative inputs.
Percentage Calculator
This percentage calculator covers all five core percentage problems: finding a percentage of a number, what percent one number is of another, reverse percentage to find the original value, percentage change between two values, and percentage difference. Each result shows step-by-step working so you can verify your answer or learn the method.
Percentage Decrease Calculator
Calculates percentage decrease in three modes: find the new value after a percentage reduction, find what percentage one value fell relative to another, or reverse-engineer the original value before a known percentage decrease. Includes step-by-step working and edge-case warnings for zero, 100%, and negative inputs.
Percentage Change Calculator
The Percentage Change Calculator measures how much a value has increased or decreased between two points, expressed as a percentage of the original value. It works in three modes: finding the % change between two numbers, applying a known % change to find a new value, and reversing a % change to recover the original. Negative starting values and sign-crossing changes are flagged with explanatory notes.