How do you calculate a percent value?
Multiply the base value by the percentage and divide by 100. Example: 150 × 20 ÷ 100 = 30.
Percentage Calculator
With the percentage calculator you can solve typical percentage tasks quickly and easily. Calculate percent values, percentages, base values, percent change as well as increases and reductions.
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Calculate percentages – basics and usage
Percentage calculations are among the most common tasks in everyday life, school and work. Whether discounts, VAT, growth or shares – percentages appear everywhere. ToolkitOne's percentage calculator solves the most common problems step by step and shows the formula transparently.
You can choose between six calculation types: percent value, percentage, base value, percent change, percent increase and percent decrease. This helps you find the right formula quickly without rearranging equations manually.
Base value
The base value is the full starting amount and equals 100 percent. If you know that 30 euros is 20 percent of an amount, the base value is the total – in this case 150 euros.
Percent value
The percent value is the share of the base value that corresponds to a given percentage. Example: 20 percent of 150 is 30. You often need this for discounts, interest or share calculations.
Percentage
The percentage describes how large a share is relative to the base value. If 30 of 150 equals 20 percent, the percentage expresses the ratio between part and whole.
Free and no storage
The percentage calculator is free, requires no sign-up and does not store inputs. Calculation runs on the server; you can enter decimals with comma or dot and receive clearly formatted results with formula and steps.
Frequently asked questions about the percentage calculator
How do you calculate what percentage one value is of another?
Divide the percent value by the base value and multiply by 100. Example: 30 ÷ 150 × 100 = 20%.
How do you calculate the base value?
Multiply the percent value by 100 and divide by the percentage. Example: 30 × 100 ÷ 20 = 150.
How do you calculate a percentage increase?
Multiply the original value by (1 + percentage ÷ 100). Example: 100 × 1.2 = 120 for a 20% increase.
How do you calculate a percentage discount?
Multiply the original value by (1 − percentage ÷ 100). Example: 100 × 0.8 = 80 for a 20% reduction.
How do you calculate the percent change between two values?
Subtract the original value from the new value, divide by the original value and multiply by 100. Example: (120 − 100) ÷ 100 × 100 = 20%.
What is the difference between percent and percentage points?
A change from 20% to 25% is an increase of 5 percentage points, but a relative increase of 25% (5 ÷ 20 × 100). Percentage points are absolute differences; percent describes the relative ratio.