Flat vs Reducing Interest Calculator
Compare flat rate and reducing balance interest online for free, on the same loan amount, rate and tenure, to see which actually costs less. Runs entirely in your browser — nothing you enter is uploaded.
Compares the same rate applied as a flat rate (interest on the full original principal throughout) versus a reducing balance (interest only on what's still owed) — the reducing-balance method is what almost all standard EMI loans actually use, and is always cheaper.
How to use flat vs reducing interest calculator
- Enter the loan amount, rate and tenure
The same three numbers work for both methods, so you can compare them directly.
- Calculate
See the EMI and total interest under a flat rate versus a reducing balance at the same nominal rate.
Features
Every rate and percentage is an input you can change, not a hidden constant — so the estimate matches your real numbers.
Calculates locally with no sign-up or server request.
Your salary and financial details are never uploaded.
Supported formats and limitations
Text and structured input supported by this tool.
Use cases include personal workflows, content preparation, and quick checks. Review output before relying on it for legal, financial, accessibility, or production decisions.
Frequently asked questions
Why is flat-rate interest so much higher for the same rate?
A flat rate charges interest on the full original principal for the entire tenure, even as you pay it down — a reducing balance only charges interest on what's still outstanding, which shrinks every month.
Which one do most loans actually use?
Nearly all standard personal, home and auto loan EMIs in India use the reducing-balance method. Flat-rate pricing shows up more in some gold loans, vehicle loans from smaller NBFCs, or scheme-specific offers — always check which one your loan agreement actually uses.