/* Calculator AI - Single-file React App (App.jsx) How to use: 1) Create a new React app with Vite: npm create vite@latest calculator-ai -- --template react cd calculator-ai 2) Install Tailwind CSS (optional but recommended): npm install -D tailwindcss postcss autoprefixer npx tailwindcss init -p // configure tailwind per docs (add content paths and imports) 3) Replace src/App.jsx with this file's contents. Add any icons or fonts if desired. 4) npm install 5) npm run dev Notes: - This single-file app is built for clarity and extensibility. It provides a small suite of calculators (BMI, mortgage, loan, percentage), a unit converter, search, history, export, dark mode, and a mock "AI suggestion" panel to emulate Calculator.net-like features. - For production: separate components into files, add proper routing (React Router), server-side rendering if needed, and secure backend APIs. */ import React, { useEffect, useState } from 'react'; export default function App() { // Theme const [dark, setDark] = useState(() => { const saved = localStorage.getItem('calcai:theme'); return saved ? saved === 'dark' : false; }); useEffect(() => { localStorage.setItem('calcai:theme', dark ? 'dark' : 'light'); document.documentElement.classList.toggle('dark', dark); }, [dark]); // Search and available calculators const calculators = [ { id: 'bmi', title: 'BMI Calculator', tags: ['health', 'body'] }, { id: 'mortgage', title: 'Mortgage Calculator', tags: ['finance', 'loan'] }, { id: 'loan', title: 'Loan Payment Calculator', tags: ['finance'] }, { id: 'percent', title: 'Percentage Calculator', tags: ['math'] }, { id: 'unit', title: 'Unit Converter', tags: ['conversion'] }, ]; const [query, setQuery] = useState(''); const filtered = calculators.filter(c => (c.title + ' ' + c.tags.join(' ')).toLowerCase().includes(query.toLowerCase())); // Router-ish const [active, setActive] = useState('home'); // History const [history, setHistory] = useState(() => { try { return JSON.parse(localStorage.getItem('calcai:history') || '[]'); } catch (e) { return []; } }); useEffect(() => { localStorage.setItem('calcai:history', JSON.stringify(history)); }, [history]); // Simple helper to record results function record(entry) { const h = [{ time: new Date().toISOString(), ...entry }, ...history].slice(0, 200); setHistory(h); } // BMI Calculator function BMICalc({ onResult }) { const [weight, setWeight] = useState('70'); const [height, setHeight] = useState('170'); const [unit, setUnit] = useState('metric'); const calc = () => { let w = parseFloat(weight), h = parseFloat(height); if (isNaN(w) || isNaN(h) || h <= 0) return null; if (unit === 'imperial') { // weight in lb, height in inches w = w * 0.45359237; h = h * 2.54; } const bmi = w / ((h/100) * (h/100)); const category = bmi < 18.5 ? 'Underweight' : bmi < 25 ? 'Normal' : bmi < 30 ? 'Overweight' : 'Obese'; const res = { calculator: 'BMI', inputs: { weight, height, unit }, result: bmi.toFixed(2), category }; onResult && onResult(res); return res; }; const [last, setLast] = useState(null); return (
setWeight(e.target.value)} />
setHeight(e.target.value)} />
{last && (
BMI: {last.result}
Category: {last.category}
)}
); } // Mortgage function MortgageCalc({ onResult }) { const [price, setPrice] = useState('300000'); const [down, setDown] = useState('60000'); const [rate, setRate] = useState('3.5'); const [years, setYears] = useState('30'); function calc(){ const P = parseFloat(price) - parseFloat(down); const r = parseFloat(rate) / 100 / 12; const n = parseFloat(years) * 12; if (isNaN(P) || isNaN(r) || isNaN(n) || n===0) return null; const monthly = (P * r) / (1 - Math.pow(1 + r, -n)); const total = monthly * n; const res = { calculator: 'Mortgage', inputs: { price, down, rate, years }, monthly: monthly.toFixed(2), total: total.toFixed(2) }; onResult && onResult(res); return res; } const [last, setLast] = useState(null); return (
setPrice(e.target.value)} className="w-full p-2 rounded border" />
setDown(e.target.value)} className="w-full p-2 rounded border" />
setRate(e.target.value)} className="w-full p-2 rounded border" />
setYears(e.target.value)} className="w-full p-2 rounded border" />
{last && (
Monthly Payment: ${last.monthly}
Total Paid: ${last.total}
)}
); } // Percentage function PercentCalc({ onResult }){ const [a, setA] = useState('100'); const [b, setB] = useState('15'); function calc(){ const res = { calculator: 'Percentage', inputs:{a,b}, result: ((parseFloat(a) * parseFloat(b))/100).toString() }; onResult && onResult(res); return res; } const [last, setLast] = useState(null); return (
setA(e.target.value)} className="w-full p-2 rounded border" />
setB(e.target.value)} className="w-full p-2 rounded border" />
{last &&
Result: {last.result}
}
); } // Unit converter (length, weight) function UnitConverter({ onResult }){ const units = { length: { m:1, cm:0.01, mm:0.001, km:1000, in:0.0254, ft:0.3048 }, weight: { kg:1, g:0.001, lb:0.45359237, oz:0.0283495 } }; const [type, setType] = useState('length'); const [from, setFrom] = useState(Object.keys(units.length)[1] || 'cm'); const [to, setTo] = useState('m'); const [val, setVal] = useState('100'); const [res, setRes] = useState(null); useEffect(()=>{ setFrom(Object.keys(units[type])[0]); setTo(Object.keys(units[type])[1] || Object.keys(units[type])[0]; ) }, [type]); function convert(){ const v = parseFloat(val); if (isNaN(v)) return null; const result = v * units[type][from] / units[type][to]; const out = { calculator: 'UnitConverter', inputs:{type,from,to,val}, result: result.toString() }; setRes(out); onResult && onResult(out); return out; } return (
setVal(e.target.value)} className="p-2 rounded border" />
{res &&
Result: {res.result}
}
); } // Export history CSV function exportCSV(){ const rows = history.map(h => [h.time, h.calculator, JSON.stringify(h.inputs || {}), h.result || h.monthly || ''].join(',')); const csv = ['time,calculator,inputs,result', ...rows].join('\n'); const blob = new Blob([csv], { type: 'text/csv' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'calculatorai-history.csv'; a.click(); URL.revokeObjectURL(url); } // Mock AI suggestion function (imitates Calculator.net editorial suggestions) function AISuggestions({ context }){ // Simple heuristic suggestions const suggestions = []; if (!context) return null; if (context.calculator === 'BMI') suggestions.push('Consider tracking waist circumference for additional health insight.'); if (context.calculator === 'Mortgage') suggestions.push('Try a 15-year loan to reduce total interest paid; increase monthly payment accordingly.'); if (context.calculator === 'Percentage') suggestions.push('Use percentage change formula to compare two values: ((new-old)/old)*100'); if (suggestions.length === 0) suggestions.push('No suggestions available; try entering different inputs.'); return (

AI Suggestions

    {suggestions.map((s,i)=>
  • {s}
    • )}
); } // Main UI return (
{active === 'home' && (

Featured Calculators

{record(r);}} /> {record(r);}} />

More Tools

record(r)} />
record(r)} />
Placeholder for additional calculators or a calculators index page.

AI / Editorial

This area emulates short editorial content like Calculator.net: explanations, formulas, examples. You can fetch real editorial content from a CMS or write a micro-knowledgebase.

)} {active === 'about' && (

About Calculator AI

A simplified, developer-friendly clone idea inspired by Calculator.net. Built for demonstrations, it includes multiple calculators, history, CSV export, and a mock AI suggestion system. Use it as a starting point for a production site with server-side rendering, SEO, and content management.

Next steps for production

  • Separate each calculator into its own component file and add routing.
  • Add unit/internationalization and accessibility improvements.
  • Use a backend (Node/Express or serverless functions) for heavy calculations, caching, analytics, and user accounts.
  • Implement editorial CMS (Headless CMS) for articles similar to Calculator.net.
)} {calculators.some(c => c.id === active) && (

{calculators.find(c=>c.id===active)?.title}

{active === 'bmi' && record(r)} />} {active === 'mortgage' && record(r)} />} {active === 'loan' &&
Loan calculator placeholder — implement amortization schedule here.
} {active === 'percent' && record(r)} />} {active === 'unit' && record(r)} />}
)}
© {new Date().getFullYear()} Calculator AI — a demo project. Not affiliated with Calculator.net.
); }

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