Online Percentage Calculator - Free

Free online percentage calculator with the five everyday calculations

Percentage is the most frequent calculation in commercial and administrative routine, and also the one that produces the most errors when done mentally. Invoice discounts, sales commissions, rent adjustments, profit margins and revenue variation between two months all come down to a percentage calculation. This tool brings the five most used types together on a single screen, without requiring you to remember each formula.

The first two modes answer the basic questions: what X% of a value is, used to apply a discount or work out a commission, and what percentage one number represents of another, useful for measuring a product share of total revenue or the weight of each expense in a budget. The next modes apply the percentage directly to the value, one for an increase and another for a discount, returning the final amount instead of just the percentage.

The fifth mode calculates the percentage variation between two values and is the one most requested in management reports: comparing July revenue against August, measuring growth of the customer base or assessing the impact of a cost increase. The result appears with its sign and matching colour, green for a rise and red for a drop, which removes the classic confusion between a 20% fall and a 20% discount.

Every calculation runs inside your browser, with no data sent to servers and no sign-up. You can use it freely with confidential revenue, cost or payroll figures, knowing that no number ever leaves your computer.