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Percentage Calculator

x% of y / Increase / Decrease
Base (y)
Percent (x%)
x% of y
0
Increase y by x%
0
Decrease y by x%
0
Discount
Original
Discount %
Amount off
0
Final price
0
Markup / Margin
Cost
Price
Markup %
Margin %
Fill in any two items (such as Cost+Price or Cost+Markup), and the rest will be calculated automatically.
Cost
0
Price
0
Markup %
Margin %
Percentage Change
Old
New
Rate % (optional)
Delta (New − Old)
0
Old increased by Rate %
0
Old decreased by Rate %
0
Given New (after increase), find Old
0
Reverse Percentage
Part (A)
Whole (B)
Percent (P%)
Given B and P%, Part
0
Tax (Add / Remove)
Rate %
Net (excl.)
Gross (incl.)
From Net + Rate
Gross: 0Tax: 0
From Gross − Rate
Net: 0Tax: 0
Options
Display
Only affects display (not internal math).

About Percentage Calculator

One place for common percentage math: “x% of y”, discounts, markup vs margin, percent change, reverse percentage, and tax add/remove. All results update instantly as you type.

  • Markup is over cost; Margin is over price. 25% markup ≠ 25% margin.
  • Reverse: fill any two fields to solve the third.