# Partially Amortized Loan Calculator

URL: https://speedycalculator.com/calculators/finance/partially-amortized-loan/
Last updated: 2026-10-25

> The partially amortized loan calculator works out the payment on a loan amortized over a long period but due sooner, the total paid during the payment period, and the balloon payment left at the end.

## Inputs

- Loan amount
- Interest rate (%)
- Amortization period (years)
- Payment period (term) (years)

## Results

- Monthly payment
- Paid during the payment period
- Balloon payment
- Total interest
- Total paid

## Formula

```
Payment = pmt(i, amortization months, L)
Balloon = bal(L, i, amortization months, payment months)
Total = payment × payment months + balloon
```

## Explanation

Partially amortized loans – common in commercial real estate – have payments based on (say) a 25-year schedule but mature in 5 or 10 years, leaving a balloon to refinance or repay.

### How to use the Partially Amortized Loan Calculator

- **Loan amount**
- **Interest rate**
- **Amortization period**
- **Payment period (term)**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the loan amount, interest rate, amortization period and payment period.

### Tips

- Compare loans by APR and total cost, not just the monthly payment.
- Extra payments go straight to principal and can save a lot of interest.
- Pay off the highest-rate debt first if you want to save the most money.
- Check for prepayment penalties before paying a loan off early.

### Common mistakes to avoid

- Stretching a loan term to lower the payment without seeing the extra interest.
- Paying only the minimum on credit cards.
- Forgetting fees that are rolled into the loan.

### Inputs explained

FieldWhat to enterLoan amountAmount in your currencyInterest rateIn %Amortization periodIn yearsPayment period (term)In years

### What each result means

- **Monthly payment** = pmt([Interest rate]÷1200, [Amortization period]×12, [Loan amount])
- **Paid during the payment period** = [Monthly payment]×[Payment period (term)]×12
- **Balloon payment** = max([Balloon payment]([Loan amount], [Interest rate]÷1200, [Amortization period]×12, [Payment period (term)]×12), 0)
- **Total interest** = [Paid during the payment period] + [Balloon payment] - [Loan amount]
- **Total paid** = [Paid during the payment period] + [Balloon payment]

### Example values

How the main result changes when **Loan amount** changes and everything else stays at the example values above:

Loan amountBalloon payment500,000390,385.43750,000585,578.151,000,000780,770.861,250,000975,963.581,500,0001,171,156.32,000,0001,561,541.73

## Worked example

Inputs — Loan amount: $1,000,000; Interest rate: 6.75 %; Amortization period: 25 years; Payment period (term): 10 years.

Results — Monthly payment = $6,909.12; Paid during the payment period = $829,093.83; **Balloon payment = $780,770.86**; Total interest = $609,864.69; Total paid = $1,609,864.69.

## FAQ

**What is a partially amortized loan?**
A loan whose payments don't fully repay it by maturity, leaving a balloon.

**Why are they used?**
They keep payments lower than a fully amortizing short loan.

**What's the risk?**
Having to refinance the balloon at a higher rate or lower property value.

**What formula does the Partially Amortized Loan Calculator use?**
Payment = pmt(i, amortization months, L).