Installment Payment Calculator — Free
Subtract a down payment from cash price and calculate equal installments on the fixed-rate balance. The worksheet compares purchase financing structure rather than reproducing a retailer’s actual card bill.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
How to use this tool
Enter price, down payment, annual rate and payment months. The financed remainder must be positive; the displayed payment total covers the installment portion separately from the upfront amount.
Results and examples
For a USD 1200 price with USD 200 down and ten interest-free payments, each installment is USD 100. Add the USD 200 upfront to the USD 1000 payment total to obtain total purchase cash outflow.
Limitations
- Merchant fees, late charges and issuer-specific installment-fee methods are excluded.
- Deferred interest and post-promotion changes can differ from this constant-rate model.
Fields
| Field | Guidance and constraints |
|---|---|
| Cash price | Accepted range: 1–10000000 · Input step: 1 |
| Down payment | Accepted range: 0–10000000 · Input step: 1 |
| Annual interest rate | Accepted range: 0–50 · Input step: 0.01 |
| Number of payments | Accepted range: 1–120 · Input step: 1 |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
How does a down payment affect principal?
For a USD 1200 price with USD 200 down and ten interest-free payments, each installment is USD 100. Add the USD 200 upfront to the USD 1000 payment total to obtain total purchase cash outflow.
Is the payment total the entire purchase outflow?
Merchant fees, late charges and issuer-specific installment-fee methods are excluded. Deferred interest and post-promotion changes can differ from this constant-rate model.
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