Percentage Calculator

Percentage Calculator covers the six most common percentage questions in a single interface: "what is X% of Y", "X is what percent of Y", "percent increase or decrease from one value to another", and "add or subtract a percent from a base value". Pick the calculation, type the two numbers, and the answer updates instantly. The tool is browser-only. Numbers never get sent anywhere — useful for sensitive figures like salary calculations, sales targets, exam scores, and personal finance numbers you'd rather not log somewhere. Common uses include working out a tip or a tax-inclusive price, figuring out the discount on a sale ("$80 was $120 — what percent off?"), calculating a salary raise ("from $52k to $58k is what percent?"), tracking week-over-week growth in a metric, and converting a fraction of completed work into a progress percentage. The percent change formula used here is (new − old) / old × 100, which is the standard finance and statistics convention. Percent increase and percent decrease are presented as the same magnitude — the labeling makes it clear whether the change is up or down based on the inputs.