Apply a percentage increase or decrease to any number — markup, discount, tip or growth, in one tap.
Applying +25% to 100 gives 125 — a gain of 25.
Apply a percentage to any starting value to get the new value. Use it for product markups, sale discounts, tip calculations, salary raises or projected growth. Enter a starting value, type or tap a percentage and see the resulting amount and absolute change — instant, no signup.
End value = Start × (1 + Percentage / 100). For a discount, the percentage is negative — e.g. 80 × (1 − 0.25) = 60. For a markup, it's positive — e.g. 80 × (1 + 0.25) = 100.
Yes. Enter the original price as the start value and the discount as a negative percentage (e.g. −20% for ‘20% off’). The end value is what the customer pays and the breakdown shows the savings.
For a markup (e.g. cost × 1.4 = retail), enter the cost and a positive percentage (+40%). For margin-from-cost calculations, this isn't the same as gross margin — margin is the profit divided by retail price, not by cost.
There's no upper limit. +900% on 100 gives 1,000 (a 10× multiplier). Negative percentages are clamped at −100% in spirit (anything below wipes the value past zero into negative territory, which is still mathematically valid).
Percentages below −100% take the value past zero. Most real-world discounts cap at −100% (you can't give more than 100% off). The calculator doesn't enforce that cap so you can still model academic or accounting scenarios where negative totals make sense.
Find the percentage increase or decrease between two values — instantly.
See your new salary after a raise — or the hike % you need to hit a target.
See exactly how your money grows — with daily, monthly, or annual compounding.
Plan monthly investments or a one-time lump sum and see the power of compounding over time.