Build your Percentage Calculator with AI in under 5 minutes

Build a percentage calculator that answers the everyday questions in plain language — what is X% of Y, X is what percent of Y, percentage change, and increase or decrease by a percent — all in the browser.

工作原理

步骤 1

描述您的想法

用纯文本提示描述您想要的内容。

步骤 2

AI 为您构建

FloopFloop 即时生成生产就绪的代码。

步骤 3

部署并上线

您的项目在几分钟内托管到专属子域名。

为什么选择 AI 构建而非雇佣开发者？

FloopFloop传统开发者
上线时间5 分钟以内2 至 8 周
费用低至 $0$5,000 - $50,000+
维护已包含持续外包费用

What is a percentage calculator?

A percentage calculator handles the small bits of maths that come up constantly but are just annoying enough to want a tool for: working out a tip or a discount, checking what percent of a budget you've spent, figuring a grade, or seeing how much a price changed. The four core questions cover almost everything — what is X% of a number, what percent one number is of another, the percentage change between two values, and a number increased or decreased by a percent. It's among the most-searched calculators on the web precisely because the formulas are easy to forget and easy to get backwards. A good one states each question in plain language, fills in the answer as you type, and is careful about the edge cases — dividing by zero, negative changes, values over 100% — instead of quietly showing a wrong or broken result.

Common features

  • What is X% of a number
  • X is what percent of Y
  • Percentage change between two values (up or down)
  • Increase and decrease a value by a percent
  • Plain-language, fill-in-the-blank layout
  • Live results as you type
  • Up/down direction shown for changes
  • Safe handling of divide-by-zero (shows a dash)
  • Copy any result; everything client-side
  • Light and dark themes; inputs remembered

Real-world examples

A discount

Someone works out 25% off a $80 item by reading the 'decreased by' result — $60 — without reaching for a separate calculator.

A grade

A student types 'what percent is 46 of 60' and gets 76.6667% instantly.

A price change

A shopper checks the percentage change from $50 to $75 and sees a green ↑ 50% — and from $100 to $80, a red ↓ 20%.

Why FloopFloop fits percentage calculator projects

A percentage calculator is a tiny tool you want instant, ad-free, and yours. FloopFloop ships the calculator you want — the exact modes you use, VAT or sales-tax presets, your own wording — on your own domain, with every calculation running in the browser. The friendly 'sentence' cards that ship by default state each question in plain English with the answer right there, and the whole thing is one prompt away from being whatever fits your workflow.

试试这些提示词

复制以下任意提示词，粘贴到 FloopFloop 即可开始构建。

Build a percentage calculator with plain-language cards. Card 1: 'What is P% of N?' Card 2: 'X is what percent of Y?' Card 3: 'Percentage change from A to B?' with an up/down arrow and colour. Card 4: a value increased and decreased by P%, showing both. Inline number inputs inside the sentences, results that update live, and a copy button on each. Guard against dividing by zero (show a dash). Keep it deterministic so the first render is hydration-safe, and remember every input in localStorage. 100% client-side.

Create a percentage calculator like the popular ones: type two numbers and get the percent. Cover 'what is X% of Y', 'X is what % of Y', and percentage increase/decrease. Keep it in the browser.

Build a friendly percent calculator for everyday maths — discounts, tips, grade percentages, percentage change — with a clean card layout and a dark theme.

Build a tool to work out percentage change between two numbers, showing whether it went up or down and by how much.

常见问题

What can it calculate?
The four everyday percentage questions: what is X% of a number, what percent one number is of another, the percentage change from one value to another (up or down), and a value increased or decreased by a percent. Each is its own little calculator that updates as you type.
How do I work out a percentage of a number?
Multiply the number by the percent and divide by 100 — so 15% of 200 is 200 × 15 ÷ 100 = 30. The first card does exactly this; just fill in the two blanks.
What's the difference between percentage change and percentage points?
Percentage change is relative to the starting value — going from 50 to 75 is a 50% increase. Percentage points are an absolute difference between two percentages (e.g. 20% to 25% is 5 points). This calculator does percentage change; ask FloopFloop if you also want a points mode.
What happens if I divide by zero?
Questions like 'X is what percent of 0' have no answer, so the calculator shows a dash instead of a misleading number — it never returns Infinity or NaN.
Is anything sent to a server?
No. Every calculation runs in your browser and your last numbers are saved to localStorage only. The single outbound surface is the /api/health probe.

相关构建类别

探索更多类别

GPA Calculator

Build a GPA calculator on the 4.0 scale: add your courses with their letter grade and credit hours to get a credit-weighted grade point average, total credits, and an honours band. Runs in the browser.

Number to Words Converter

Build a number-to-words converter that spells any number in plain English and writes amounts the way you would on a check (one thousand two hundred thirty-four and 50/100). Runs in the browser.

BMI Calculator

Build a BMI calculator that works out your Body Mass Index in metric or imperial, shows your WHO category on a colour-coded gauge, and gives your healthy weight range — all in the browser.

Loan & Mortgage Calculator

Build a loan and mortgage calculator that finds the monthly payment, total interest, and full amortization schedule for any loan — adjust the amount, interest rate, and term with live sliders. Everything runs in the browser.

Tip Calculator

Build a browser-side tip calculator with preset percentages (15 / 18 / 20 / 22 / 25 + custom), people-stepper bill split, tax-aware mode, round-up toggle, and multi-currency support — wrapped in a vintage diner-receipt visual identity no other tip tool ships.

Unit Converter

Build a unit converter for length, weight, temperature, volume, area, speed, time, and digital storage — instant two-way conversion that runs entirely in the browser, generated from a single prompt.

准备好开始构建了吗？

立即开始构建您的项目——无需编写代码。

帮我生成这个