Flat to Reducing Rate Conversion: Table, Formula and Calculator
Dealers, consumer-durable finance desks and informal lenders often quote a flat rate, because a small number sells better. To compare that quote against a bank or NBFC offer you have to convert it to a reducing-balance rate first. This page gives you the formula, a ready-made table and a live converter.
Flat vs Reducing Rate Calculator
Live comparisonEnter the rate a lender quoted you. We show the EMI both ways, and the reducing rate that flat quote really equals.
The conversion formula
Reducing rate ≈ flat rate × (2N ÷ (N + 1)), where N is the number of monthly instalments. For a 12-month loan the multiplier is about 1.85; for 24 months about 1.92; for 36 months about 1.95. The multiplier never quite reaches 2.
Flat to reducing rate conversion table
| Flat rate quoted | 12-month loan | 24-month loan | 36-month loan |
|---|---|---|---|
| 6% flat | ~11.1% reducing | ~11.5% reducing | ~11.7% reducing |
| 8% flat | ~14.8% reducing | ~15.4% reducing | ~15.6% reducing |
| 10% flat | ~18.5% reducing | ~19.2% reducing | ~19.5% reducing |
| 12% flat | ~22.2% reducing | ~23.0% reducing | ~23.4% reducing |
| 14% flat | ~25.8% reducing | ~26.9% reducing | ~27.3% reducing |
| 15% flat | ~27.7% reducing | ~28.8% reducing | ~29.2% reducing |
| 18% flat | ~33.2% reducing | ~34.6% reducing | ~35.0% reducing |
| 24% flat | ~44.3% reducing | ~46.1% reducing | ~46.7% reducing |
Indicative equivalents using the 2N ÷ (N + 1) approximation. Use the converter above for an exact figure on your own quote.
Converting in the other direction
To go from reducing to flat, divide instead of multiplying: flat ≈ reducing rate × (N + 1) ÷ 2N. A 28% reducing-rate loan over 24 months is roughly a 14.6% flat quote — useful when a lender insists on comparing like with like on their terms.
A real comparison
A dealer offers ₹60,000 over 24 months at 9% flat: interest is ₹10,800 and the EMI ₹2,950. A bank offers the same amount at 16% reducing: interest is about ₹8,500 and the EMI ₹2,854. The 16% offer looks nearly twice as expensive and is in fact more than ₹2,000 cheaper.
How Privena prices its loans
Privena quotes only reducing-balance rates, with the APR — interest plus processing fee, annualised — printed in your Key Fact Statement before you accept. There is no flat-rate product and no conversion for you to do.
Frequently asked questions
- How do you convert a flat rate to a reducing rate?
- A quick approximation is reducing rate ≈ flat rate × (2N ÷ (N + 1)), where N is the number of EMIs. For a 24-month loan that is about 1.92 times the flat rate. For an exact figure, use the converter, which solves for the reducing rate that produces the same monthly outflow.
- Is a 10% flat rate the same as 10% reducing?
- No. Over 24 months a 10% flat rate is worth roughly 19% on a reducing basis, because the flat structure keeps charging interest on principal you have already repaid.
- Why does the conversion factor change with tenure?
- The longer the tenure, the more principal you have repaid by the time later interest is charged, so the gap between the flat and reducing structures widens. The factor rises from about 1.85 over 12 months towards 2 over long tenures.
- Which rate should I compare between lenders?
- Neither in isolation. Compare the APR in each Key Fact Statement, which annualises the reducing-balance interest together with the processing fee and other mandatory charges.
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