Financial calculators
Eight tools that actually compute — EMI, SIP, compound and simple interest, fixed and recurring deposits, loan eligibility, and a credit-score guide. Each shows its formula, a worked example and the split behind the headline. Everything runs inside your browser; nothing is uploaded, nothing is stored.
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EMI & amortisation
Monthly instalment, total interest, and a month-by-month repayment schedule.
OpenSIP projection
Project a monthly mutual-fund investment at an assumed rate, with a growth chart.
OpenCompound & lumpsum
Grow a one-time amount at a chosen compounding frequency.
OpenSimple interest
Flat interest on a principal for informal loans and back-of-envelope checks.
OpenFD maturity
Fixed-deposit maturity with quarterly compounding, the bank standard.
OpenRD maturity
Recurring deposit: a fixed monthly saving grown to maturity.
OpenLoan eligibility
The FOIR arithmetic a credit officer runs, before you fill in a form.
OpenCredit score guide
What each band means, and a checklist to move your number up.
OpenEMI calculator with amortisation schedule
Your Equated Monthly Instalment stays constant, but its split shifts: early instalments are mostly interest, later ones mostly principal. Drag the sliders to see both the instalment and the full repayment split.
Equated Monthly Instalment
From ₹1 lakh to ₹2 crore.
Home loans currently start at 8.35% p.a. for a strong salaried profile.
A longer tenure lowers the EMI and raises the total interest you pay.
Indicative only. Processing fees, insurance and statutory charges are not included, and floating rates reset over the tenure. Final rates are set by the lender after credit assessment.
How the EMI is worked out
The instalment is a level annuity that clears the principal and its interest across the tenure:
EMI = P · i · (1 + i)n ÷ ((1 + i)n − 1)
- P — principal (loan amount)
- i — monthly rate = annual rate ÷ 12 ÷ 100
- n — number of months = tenure × 12
₹25,00,000 at 8.5% for 20 years
With i = 0.7083% a month over 240 months, the instalment works out to ₹21,696.
Across the full tenure you repay ₹52,06,939 — the ₹25,00,000 you borrowed plus ₹27,06,939 of interest. Interest is larger than the principal, which is why tenure matters as much as rate.
Amortisation schedule — a worked ₹1,20,000 loan at 12% over 1 year
A short loan makes the mechanics visible. Watch the interest column shrink and the principal column grow while the instalment stays level. The closing balance reaches exactly ₹0 on the final row; the last instalment adjusts by a rupee or two to clear it.
| Month | Opening balance | Instalment | Interest | Principal | Closing balance |
|---|---|---|---|---|---|
| 1 | ₹1,20,000 | ₹10,662 | ₹1,200 | ₹9,462 | ₹1,10,538 |
| 2 | ₹1,10,538 | ₹10,662 | ₹1,105 | ₹9,557 | ₹1,00,981 |
| 3 | ₹1,00,981 | ₹10,662 | ₹1,010 | ₹9,652 | ₹91,329 |
| 4 | ₹91,329 | ₹10,662 | ₹913 | ₹9,749 | ₹81,580 |
| 5 | ₹81,580 | ₹10,662 | ₹816 | ₹9,846 | ₹71,734 |
| 6 | ₹71,734 | ₹10,662 | ₹717 | ₹9,945 | ₹61,789 |
| 7 | ₹61,789 | ₹10,662 | ₹618 | ₹10,044 | ₹51,745 |
| 8 | ₹51,745 | ₹10,662 | ₹517 | ₹10,145 | ₹41,600 |
| 9 | ₹41,600 | ₹10,662 | ₹416 | ₹10,246 | ₹31,354 |
| 10 | ₹31,354 | ₹10,662 | ₹314 | ₹10,348 | ₹21,006 |
| 11 | ₹21,006 | ₹10,662 | ₹210 | ₹10,452 | ₹10,554 |
| 12 | ₹10,554 | ₹10,660 | ₹106 | ₹10,554 | ₹0 |
| Total | ₹1,27,942 | ₹7,942 | ₹1,20,000 | ₹0 |
On every row, interest plus principal equals the instalment, and each month's closing balance carries into the next month's opening balance. Total principal repaid equals the ₹1,20,000 borrowed. A real lender's schedule may round differently and will add fees; ask the lender for its own amortisation statement before you sign.
SIP calculator with growth chart
A Systematic Investment Plan invests a fixed sum each month. The projection below assumes a constant rate of return — real markets never move in a straight line, so read the output as an illustration, not a promise.
Systematic investment plan projection
From ₹500 to ₹2,00,000 a month.
Indian equity index funds have historically delivered 11–13% over long periods. Past performance does not indicate future returns.
Time in the market does most of the work through compounding.
Mutual fund investments are subject to market risk. Read all scheme-related documents carefully. Projections assume a constant rate of return, which markets never deliver. YouBankingBuddy does not provide investment advice or recommend any scheme.
Invested vs projected value over 15 years
The straight navy line is money you put in (rising to ₹18,00,000). The gold curve is the projected value (₹50,45,760). The gap between them is compounding. Illustrative only.
Future value of a monthly SIP
Each instalment is invested at the start of its month — a growing annuity-due:
FV = M · ((1 + i)n − 1) ÷ i · (1 + i)
- M — monthly investment
- i — monthly return = annual ÷ 12 ÷ 100
- n — number of instalments = years × 12
Worked example: ₹10,000 a month for 15 years (180 instalments) at an assumed 12% projects to ₹50,45,760, of which ₹18,00,000 is invested and ₹32,45,760 is projected growth.
Compound & lumpsum interest calculator
Grow a single amount at a chosen compounding frequency. The more often interest compounds, the more it earns — annually, half-yearly, quarterly or monthly.
Compound interest on a lumpsum
An estimate only. It assumes a constant rate with no withdrawals, additions or tax. Interest actually earned on a deposit is taxable as income and TDS may apply. Verify the applicable rate with the institution.
Compound interest
A = P · (1 + r / f)f · t
- P — principal, A — maturity amount
- r — annual rate as a decimal
- f — compounds per year (1, 2, 4 or 12)
- t — years
₹1,00,000 at 12%, compounded annually, 10 years
The amount grows to ₹3,10,585 — ₹2,10,585 of interest on the original ₹1,00,000.
Simple interest over the same period would give only ₹1,20,000. The extra ₹90,585 is interest earning its own interest.
Simple interest calculator
Simple interest is charged only on the original principal — it never compounds. It is common in short informal loans, some vehicle loans and gold loans. The calculator also shows what compound interest would have been, so you can see the difference.
Simple interest
An estimate only, before any fees or tax. The compound comparison assumes quarterly compounding. Always confirm whether a lender charges simple or reducing-balance interest — the difference on a long loan is large.
Simple interest
SI = P · r · t
- P — principal
- r — annual rate as a decimal
- t — years
₹2,00,000 at 8% for 3 years
Interest is ₹2,00,000 × 0.08 × 3 = ₹48,000, so you repay ₹2,48,000 in all.
Had it compounded quarterly, interest would have been ₹53,648 — ₹5,648 more. Simple interest favours the borrower; compound favours the saver.
Fixed deposit maturity calculator
Indian banks compound FD interest quarterly by convention. Enter your deposit, rate and tenure to see the maturity value. Senior citizens usually earn about 0.50% more than the rate shown.
FD maturity value
1-year FDs currently reach up to 7.25% p.a. across our listed banks.
Figures are pre-tax and indicative. Interest on bank deposits is taxable as income; TDS applies above ₹40,000 of interest in a financial year (₹50,000 for senior citizens). Premature withdrawal usually attracts a penalty. Deposits are insured by the DICGC up to ₹5 lakh per bank per depositor.
Recurring deposit maturity calculator
A recurring deposit puts a fixed sum away every month at a fixed rate — disciplined saving without market risk. This tool projects the maturity value assuming monthly compounding; banks that compound quarterly will show a slightly different figure, so treat the result as indicative.
RD maturity value
Indicative and pre-tax; this tool assumes monthly compounding, while many banks compound RD interest quarterly. Interest is taxable and TDS may apply. Missing an instalment usually attracts a small penalty. Confirm the exact maturity value with your bank.
₹5,000 a month for 5 years at 7%
You deposit ₹5,000 × 60 = ₹3,00,000 in total. At an assumed 7% with monthly compounding, it matures at about ₹3,60,053 — roughly ₹60,053 of interest. Because each instalment compounds for a different length of time, an RD earns less than a lumpsum FD of the same total, but it is far easier to fund from a monthly salary.
Loan eligibility calculator (FOIR)
Lenders cap the share of your income that may go to EMIs — the Fixed Obligation to Income Ratio, or FOIR. Most use 50%; some stretch to 65% for higher incomes. This runs the same arithmetic a credit officer does, on your device, with no credit pull.
Indicative loan eligibility
Most lenders apply 50%. Incomes above ₹1 lakh a month are often assessed at 60–65%.
This is an estimate, not an offer, a sanction or a pre-approval. Lenders also weigh your credit score, employment stability, property value, age and internal policy. Nothing here guarantees approval, and approval is at the lender's sole discretion.
₹80,000 income, ₹12,000 of existing EMIs
At a 50% FOIR the lender allows ₹40,000 of total EMIs. Subtract your existing ₹12,000 and ₹28,000 is free for a new EMI. Run the EMI formula backwards at 8.75% over 20 years and that supports a loan of about ₹31,68,458 — roughly 35% of income going to the new EMI. Raise the tenure or lower the rate and the eligibility rises; add another EMI and it falls.
Credit score guide & improvement checklist
Your credit score decides your interest rate as much as your income does. The gap between a 690 and a 780 score on a ₹50 lakh home loan is roughly ₹9.4 lakh in extra interest over twenty years. Here is what each band means, and how to move up.
What moves it up
- Pay every EMI and card bill in full, on or before the due date
- Keep credit utilisation under 30% of your total limit
- Hold older accounts open — length of history carries weight
- Keep a healthy mix of secured and unsecured credit
- Check your report yearly and dispute any error with the bureau
What drags it down
- Paying only the minimum due, month after month
- Applying to five lenders in a fortnight — each is a hard enquiry
- Settling a loan rather than closing it fully
- Running cards close to their limit every cycle
- A cheque bounce or an EMI dishonoured for want of funds
What does not affect it
- Checking your own score — that is a soft enquiry
- Your salary, savings balance or investment portfolio
- Using a debit card or UPI, however heavily
- Income tax paid, or your employer's reputation
- Declining a pre-approved offer you did not want
Bureau scores are produced by credit information companies registered under the Credit Information Companies (Regulation) Act, 2005, such as CIBIL and Experian. Scoring models differ, so your number varies slightly between bureaus. Checking your own score is a soft enquiry and never lowers it. YouBankingBuddy does not retrieve your credit report and running these calculators has no effect on your score.
Run the numbers, then talk it through — free
A calculator gives you a figure; a buddy helps you read it. We will happily tell you to wait, to shorten a tenure, or not to borrow at all. No sales pitch, no charge, ever.
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