Answer the three everyday percentage questions in one place: what is P% of a value, N is what percent of a value, and what a value becomes after adding or subtracting a percent. Results update as you type.
Percent means "per hundred", so P% of V is simply P × V / 100. The calculator is handy for tips, discounts, taxes and exam scores — anything expressed as a part of a whole.
Frequently asked questions
How do I calculate a tip?
For a 15% tip on $80: 15% of 80 = $12, so pay $92 in total — both numbers come straight out of this page.
What is the difference between "of" and "off"?
"20% of $50" is $10; "$50 with 20% off" is $40. The first is a part, the second is a discount.
Can percentages exceed 100?
Yes — 150% of a value means 1.5× it, common when comparing growth against a baseline.
中文说明
一站式解决三种最常见的百分比问题：某数的 P% 是多少、N 占某数的百分比是多少、以及某数增加或减少一个百分比后是多少。输入即实时更新。
百分比即"每一百份中的份数"，因此 P% × V 就是 P × V ÷ 100。适用于小费、折扣、税费、考试成绩——一切"部分占整体"的计算。
常见问题
怎么算小费？
80 美元的 15% 小费 = 12 美元，共付 92 美元——两个数字都能在本页直接算出。
"百分之多少"和"打几折"有什么区别？
"50 的 20%"是 10；"50 打 8 折（减 20%）"是 40。前者是部分，后者是折扣。
百分比可以超过 100 吗？
可以——某数的 150% 就是它的 1.5 倍，在增长对比中很常见。