Modoo Calculator

17 everyday calculators — salary, tax, loan, mortgage & more. AI included.

💼 Modoo Calculator — Smart Everyday Calculator

Stop doing complex calculations by hand.
From salary take-home pay and payroll taxes to loan repayments, mortgage, real estate taxes, and more —
17 essential calculators in one app, updated with 2026 tax rates.

Ask Modoo AI in plain English.
"What's my take-home pay on $80,000?" or "Monthly payment for a $400,000 mortgage at 6.8% for 30 years?"
— get instant answers.

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📊 Key Features
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💰 Salary Calculator
Enter your gross salary to instantly see your net take-home pay after taxes and deductions.
Compare two salaries side by side with the Salary Comparison tab.

🏥 Payroll / Insurance Calculator
Employee and employer contributions for pension, health, and employment insurance. Freelancer rates included.

🧾 VAT / Sales Tax Calculator
Calculate VAT forward or reverse. US users get a state + local sales tax calculator.

🏦 Loan Calculator
Equal principal+interest, equal principal, or bullet repayment. Full amortization schedule included.

🏡 Mortgage Calculator
Monthly payment, total interest, PMI, and amortization schedule at a glance.

⚖️ BMI / Ideal Weight Calculator
BMI and weight category on an intuitive gauge. Supports kg/cm and lb/in.

📅 D-Day / Date Calculator
Days between two dates, business days (excl. weekends & holidays), and date N days from today.

📐 Unit Converter
Length, weight, temperature, area, volume, and speed. Includes US units (qt, fl oz).

💼 Severance Pay Calculator
Estimated severance pay based on hire date, resignation date, and monthly salary.

📋 Income Tax Calculator
Comprehensive income tax estimate with 2026 brackets and personal deductions.

⏰ Minimum Wage Calculator
Auto-converts hourly minimum wage to daily, monthly, and annual. Includes overtime rates.

🌴 Annual Leave Calculator
Statutory leave days from hire date, remaining days, and next year's estimate.

📈 Stock Return Calculator
Profit and return rate with domestic/overseas transaction taxes and brokerage fees.

🏠 Real Estate Calculator
Acquisition tax, capital gains tax, and jeonse loan limits. Tax rate auto-applied by property count.

🍽️ Calorie Calculator
BMR and TDEE via Mifflin-St Jeor. Supports lb/in and activity-based calorie goals.

💸 Discount & Tip Calculator
Final price by discount rate, amount, or reverse. Tip and per-person split included.

🧮 Basic Calculator
Standard arithmetic with percentage.

🤖 Modoo AI
Ask in plain language — "What's my take-home on $80K?", "Calculate 3-year severance on $3,500/month" —
and get instant results powered by on-device AI (Gemma 4).
Works fully offline. Your data never leaves your device.
Tap [Open Calculator] below the AI answer to jump straight to the relevant calculator.

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✨ App Highlights
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• 2026 tax rates and contribution rates built in
• Modoo AI: ask in plain language, get instant calculations
• App language follows your device setting (Korean / English)
• Calculation history: save results and restore previous inputs
• Home screen widget for quick access to favorite calculators
• Works fully offline — no internet required

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🔒 Privacy
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All data you enter is processed on your device only.
Nothing is sent to or stored on external servers.

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📬 Feedback
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Found a bug or have a suggestion? Leave a review or contact us through the app.
We're always working to make Modoo Calculator better.