Loan Calculators and Guides
10 calculators · 12 guides
This hub collects every Calcumetrics loan calculator and the guides that explain the numbers behind them. Start with the EMI calculator for any fixed-rate instalment loan, then move to the home loan, car loan or mortgage calculators when you also need the down payment, total interest and the full repayment schedule.
Before you borrow, the affordability and debt-to-income calculators show how much a lender is likely to approve against your income. After you borrow, the amortization and prepayment calculators show how each payment splits between interest and principal, and whether a part-payment should cut your EMI or your tenure. If you only know the payment, the interest rate calculator works backwards to the rate you are really paying, and the credit card payoff calculator shows what a higher monthly payment saves.
The guides cover the decisions people get stuck on: flat versus reducing rates, fixed versus floating loans, what to do after a rate hike, and which debt to repay first. It is written for first-time borrowers, home buyers comparing offers and anyone planning to become debt-free. Every calculator runs in your browser, so the figures you enter are never sent to us.
EMI and loan repayment
EMI Calculator
Calculate monthly EMI, total interest, and repayment schedule for any loan.
GlobalHome Loan Calculator
Calculate home loan EMI, total interest paid, and year-by-year amortization schedule.
GlobalCar Loan Calculator
Calculate monthly car loan payments, total cost, and interest over the loan term.
GlobalLoan Amortization Calculator
Generate a loan amortization schedule showing principal, interest, and remaining balance.
GlobalLoan Prepayment Calculator
Calculate interest savings and revised tenure when making a partial prepayment on your loan.
GlobalInterest Rate Calculator
Solve for the implied interest rate from principal, payment, time, and repayment inputs.
Guides
- How Loan Amortization Actually Works: Why Your Early EMIs Barely Touch the PrincipalDiscover the compounding mechanics of loan amortization schedules, why early payments are mostly interest, and how early prepayments save massive interest.
- Flat vs. Reducing Interest Rate: Why a 10% Flat Loan Actually Costs 18% APRLearn the difference between flat and reducing interest rates, how to convert a flat rate into true reducing APR, and why a 10% flat loan actually costs ~18%.
- Fixed vs. Floating Interest Rate Loans: How to Decide in Changing Rate CyclesCompare fixed rate certainty against floating rate benchmark savings. Learn how rate cycles, reset spreads, and prepayment penalties dictate the best choice.
- Home Loan Prepayment vs. SIP: Which Builds More Wealth?Prepay an 8.5% home loan or invest in an equity mutual fund SIP? Compare guaranteed debt savings with compounding market returns and tax rules.
- Rate Hike: Should You Increase Your EMI or Extend the Tenure? (Which Saves More)Should you increase your EMI or extend tenure after a rate hike? Compare the ₹3.48 lakh interest difference and see why raising EMI saves far more money.
- RBI Repo Rate Hike to 5.50%: How Much Will Your Home Loan EMI Increase?The RBI repo rate hike to 5.50% increases home loan EMIs by ₹477 to ₹1,589 per month. Calculate your revised payment, extra interest, and tenure impact.
- SBI Home Loan Rate Hike, October 2026: EMI or Longer Tenure?SBI home loans start at 7.50% from 15 October 2026. Compare 20-year EMIs on ₹30 lakh and ₹50 lakh, total interest and floating-rate borrower options.
Mortgages and borrowing limits
Mortgage Calculator
Estimate mortgage payments, total interest, and repayment over the loan term.
GlobalLoan Affordability Calculator
Estimate the loan amount that may fit within a chosen repayment budget.
GlobalDebt-to-Income Ratio Calculator
Calculate debt-to-income ratio from monthly debt obligations and income.
Guides
- Debt-to-Income (DTI) Ratio: What Lenders Look for and How to Qualify for a MortgageMaster the debt-to-income ratio calculations lenders use for mortgages. Learn the 28/36 rule, front-end vs back-end DTI, and steps to lower your ratio.
- Debt-to-Income Ratio in the UK: What Lenders Actually Look At (And How to Calculate Yours)UK mortgage lenders use Loan-to-Income multiples and stress tests instead of DTI. Learn how affordability works and calculate your ratio under FCA rules.
- How Mortgage Amortization Works: Every Payment Explained (With the Exact Math)See how mortgage payments split between principal and interest, why early payments are interest-heavy, and how extra payments cut your loan payoff date.
- Mortgage Rates Hit 7.4%: Should You Buy a Home Now or Wait?With US mortgage rates hitting 7.4%, compare the $105,706 interest difference, analyze the buy vs wait debate, and run your debt-to-income affordability test.
Paying off debt
How to choose a loan calculator
Use the EMI calculator for any fixed-rate instalment loan, and the home loan or car loan calculator when you also want the down payment and total cost. US home buyers should use the mortgage calculator.
Before you borrow, the loan affordability and debt-to-income calculators show how much a lender is likely to approve against your income. Once you have a loan, the amortization calculator shows how each payment splits between interest and principal, and the prepayment calculator compares reducing the EMI with reducing the tenure.
If you know the payment and loan amount but not the rate, the interest rate calculator finds the rate you are really paying. For card balances, the credit card payoff calculator shows how long minimum payments take and what a higher payment saves.
For a vehicle quote, the car loan calculator with down-payment comparisons shows how changing your upfront payment affects both EMI and total interest.
Use the EMI calculator to compare monthly payments and total interest when choosing between repayment terms. Its worked personal-loan example makes the cost of a longer term visible.