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Loan & Interest Calculator

Under maintenance

Try for free

A simple and powerful tool to calculate **loan payments, interest, and schedules** with optional extra payments and compound interest.

Pricing

from $1.00 / 1,000 results

Rating

0.0

(0)

Developer

Jamshaid Arif

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Bookmarked

Total users

Monthly active users

4 days ago

Last modified

💰 Loan Calculator

A simple and powerful tool to calculate loan payments, interest, and schedules with optional extra payments and compound interest.

🚀 Features

Calculate monthly payments based on principal, interest rate, and term
Supports extra monthly payments to reduce total interest
Handles different compounding frequencies: monthly, quarterly, annually
Output includes total interest paid, total payment, and payment schedule
Optional currency symbol for results
Easy integration into APIs, scripts, or automation pipelines

📥 Input Schema

Field	Type	Required	Description
`principal`	number	✅ Yes	Principal loan amount (must be > 0)
`annualRate`	number	✅ Yes	Annual interest rate as a percentage
`termMonths`	integer	✅ Yes	Loan term in months
`extraPayment`	number	❌ No	Extra payment applied each month (default: 0)
`startDate`	string	❌ No	Start date in YYYY-MM-DD format (defaults to today)
`currency`	string	❌ No	Currency symbol for display (default: $)
`compoundFrequency`	string	❌ No	How often interest compounds: `monthly`, `quarterly`, or `annually` (default: monthly)

⚙️ How It Works

📊 Monthly Payment Formula

For standard loans without extra payments:

r = monthly interest rate = annualRate / 12 / 100
n = termMonths
payment = principal * (r * (1 + r)^n) / ((1 + r)^n - 1)

Extra monthly payments reduce total interest and shorten the loan term.
Compounding frequency adjusts how interest accrues over time.

🧮 Example

Input

{
  "principal": 10000,
  "annualRate": 5,
  "termMonths": 24,
  "extraPayment": 50,
  "currency": "$",
  "compoundFrequency": "monthly",
  "startDate": "2026-03-01"
}

Output

{
  "monthlyPayment": 438.71,
  "totalPayment": 10497.00,
  "totalInterest": 497.00,
  "schedule": [
    { "month": 1, "payment": 438.71, "principalPaid": 396.04, "interestPaid": 42.67, "balance": 9603.96 },
    ...
  ]
}

🏗️ Use Cases

Personal finance planning
Loan calculators for banks or fintech apps
Integration into web apps or dashboards
API automation for loan comparison or analysis

⚡ Notes

extraPayment is optional and can accelerate payoff
compoundFrequency affects interest calculation; monthly is standard
startDate defaults to the current date if empty

📄 License

MIT License

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