₹
₹500₹1,00,00,000
₹
₹1₹1,00,00,000
1240
Rate Per Month
2.00%Byaj per ₹100 per month (sekda)
2.00%Total Repayment
₹62,000Annual Rate (simple)24.00%
Principal
Interest
Total₹62,00019% returns
All Calculators
Interest Rate Calculator
Work backwards from the amount repaid to the rate you were actually charged
What is Interest Rate Calculator?
An interest rate calculator works backwards. Instead of asking "how much byaj will I pay", it answers "what rate was I actually charged". Give it the amount borrowed, the total interest that changed hands and how long the money was out, and it returns the rate per month, the equivalent sekda figure, and the simple annual rate. This is the calculation that turns an informal arrangement — "I gave him ₹50,000 and got ₹62,000 back after a year" — into a number you can compare with anything else.
How to use VyajPay's Interest Rate Calculator?
Enter the amount borrowed, the total interest paid over the whole period, and the number of months. The calculator divides the interest across the principal and the months to give the monthly rate, then multiplies by 12 for the annual figure. Because sekda is defined as rupees per hundred per month, the monthly percentage and the sekda figure are the same number — ₹2 sekda is 2% a month.
01
Adjust the sliders or type values to match your scenario.
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Watch the donut chart update live — blue arc = your returns.
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Read the result summary below the inputs for the final numbers.
Why use VyajPay's Interest Rate Calculator?
- Reveals the real rate behind an informal loan quoted only as a repayment amount
- Converts any deal into a monthly rate, a sekda figure and an annual rate at once
- Useful for checking a quote before you agree to it, on either side of the loan
- Free and instant — no signup, no account, works on any phone
Frequently Asked Questions
Subtract the amount borrowed from the total repaid to get the interest, then enter that figure here along with the principal and the number of months. The calculator returns the monthly and annual rate.
Simple interest. It spreads the total interest evenly across the principal and the term, which is how informal lending in India is normally quoted. If the interest was compounded, the true periodic rate will be lower than the figure shown.
Sekda means rupees per ₹100 per month. Since a percentage is also "per hundred", ₹2 per ₹100 per month is 2% per month — the same number in different words.
Informal lending is commonly quoted between ₹1 and ₹3 per hundred per month, which is 12% to 36% a year. Rates above that are widespread but several states cap what a registered money lender may charge — check the Money Lenders Act in your state.
Related calculators
Simple Interest (Byaj)Calculate flat-rate interest on loans — daily, monthly, or yearlyCompound InterestInterest on interest — see how compounding grows your loan or investmentEMI CalculatorReducing balance EMI — used by banks for home, car & personal loansFlat Rate EMIFlat rate EMI calculation common in informal lending — see the true costSekda Byaj CalculatorRupees per hundred per month converted to a real annual rateMahajani Byaj CalculatorInterest-only lending — byaj every month, principal returned at the endLoan Type ComparisonFlat vs reducing balance vs interest-only — same money, three costsSIP CalculatorCalculate wealth created by monthly SIP investments with compounding returns
Byaj ka hisab, the Indian way
Ready to track your actual loans?
Use these calculators to plan, then track your real loans, EMIs and borrowers in the VyajPay app for Android and iPhone.