Calculator Land

# Guide to the percentage calculators

The percentage calculators answer the everyday percentage questions: a share of a number, the change between two values, a discount, a markup or a profit. Each one shows the formula and the steps it used, so the answer can be checked by hand.

## Percentage

### [Percentage Calculator](https://www.calculator.land/calculators/percentage-calculator/)

A percentage calculator with four tabs: a percentage of a number, what percentage one number is of another, the percentage change between two values, and the whole from a part and its percentage. A quick converter switches between fractions, decimals and percentages, and every tab shows the formula step by step.

**Quality:**

  • - Checked with real keystrokes in the browser in every language version, and passed (October 2026).
  • - The answer is calculated from the exact digits you typed, and the calculation steps show ≈ instead of = where a line is rounded.
  • - The quick converter turns a decimal or a percentage into an exact fraction from the digits you typed: 0.12345 gives 2469/20000.

### [Percentage Change Calculator](https://www.calculator.land/calculators/percentage-change/)

Works out the percentage change from an original value to a new value and labels it as an increase, a decrease or no change. It shows the formula and the steps, and has quick examples that load their values with one click.

**Quality:**

  • - Checked with real keystrokes in the browser in every language version, and passed (October 2026).
  • - The answer is calculated from the exact digits you typed, and the calculation steps show ≈ instead of = where a line is rounded.
  • - The original value must be greater than 0, and anything else gives an error message instead of a percentage.

### [Percentage Decrease Calculator](https://www.calculator.land/calculators/percentage-decrease/)

Has two modes: decrease a number by a given percentage, or find the percentage decrease from an original value to a new one. Both show the calculation step by step.

**Quality:**

  • - Checked with real keystrokes in the browser in every language version, and passed (October 2026).
  • - The answer is calculated from the exact digits you typed, and the calculation steps show ≈ instead of = where a line is rounded.
  • - Both modes require an original value greater than 0 and show an error message otherwise.

### [Percentage Difference Calculator](https://www.calculator.land/calculators/percentage-difference/)

Compares two values with the symmetric formula, which divides the absolute difference by the average of the two values rather than by either one. It also shows the absolute difference, the average and a bar comparing the two values.

**Quality:**

  • - Checked with real keystrokes in the browser in every language version, and passed (October 2026).
  • - The answer is calculated from the exact digits you typed, and the calculation steps show ≈ instead of = where a line is rounded.
  • - Both values must be greater than 0, so the average it divides by is never 0: 0 and 0 give an error message, not 0 %.

### [Percentage Increase Calculator](https://www.calculator.land/calculators/percentage-increase/)

Has two modes: the percentage increase between two numbers, or a number with a percentage added. It shows the increase and the new value step by step, and says so when the new value is lower.

**Quality:**

  • - Checked with real keystrokes in the browser in every language version, and passed (October 2026).
  • - The answer is calculated from the exact digits you typed, and the calculation steps show ≈ instead of = where a line is rounded.
  • - When the new value is lower than the original, the heading and the steps say decrease, not increase.

### [Percentage Markup Calculator](https://www.calculator.land/calculators/percentage-markup/)

Works out a selling price from a cost and a markup percentage, or the markup percentage from a cost and a selling price. It also shows the profit and the gross margin, and the page has a table that converts markup to margin.

**Quality:**

  • - Checked with real keystrokes in the browser in every language version, and passed (October 2026).
  • - The answer is calculated from the exact digits you typed, and the calculation steps show ≈ instead of = where a line is rounded.
  • - A cost or a selling price of 0 gives an error message instead of a number, because the markup or the margin would divide by zero.

### [Percentage Off Calculator](https://www.calculator.land/calculators/percentage-off/)

Takes an original price and a discount percentage and shows the amount saved and the final price. It has buttons for common discounts, a bar showing what you pay and what you save, and a reference table.

**Quality:**

  • - Checked with real keystrokes in the browser in every language version, and passed (October 2026).
  • - The answer is calculated from the exact digits you typed, and the calculation steps show ≈ instead of = where a line is rounded.
  • - A saving that is not zero is never shown as 0.00: very small amounts are shown with up to four significant digits.

### [Profit Percentage Calculator](https://www.calculator.land/calculators/profit-percentage/)

Works out the profit and the profit percentage from a cost price and a selling price, or the selling price needed for a target profit percentage. It shows the profit margin as well, and marks a loss when the selling price is below the cost.

**Quality:**

  • - Checked with real keystrokes in the browser in every language version, and passed (October 2026).
  • - The answer is calculated from the exact digits you typed, and the calculation steps show ≈ instead of = where a line is rounded.
  • - A cost price or a selling price of 0 gives an error message instead of a number, because the profit percentage or the margin would divide by zero.