Debt Cost
Calculate total debt cost using simple interest. Enter your principal, annual rate, and time to see total interest payable and full repayment with charts.
About This Calculator
The Total Debt Cost Calculator helps you compute the true cost of borrowing using the simple interest formula. By entering the principal amount, annual interest rate, and time period in years, you get an instant breakdown of total interest payable and the full repayment amount. This is useful for evaluating personal loans, education loans, car loans, and other debt instruments where simple interest applies.
This calculator uses the standard simple interest formula: Total Interest = Principal x Rate x Time / 100. The total repayment is the sum of the principal and the calculated interest. Unlike compound interest which charges interest on accumulated interest, simple interest is calculated only on the original principal, making costs predictable and linear over time.
Regional Notes
India (IN): Indian banks and NBFCs use simple interest for many personal and education loans. The RBI mandates standardized APR disclosure. For loans above ₹5 lakh, always verify whether the lender uses simple or reducing-balance (compound) interest.
United States (US): The Truth in Lending Act (TILA) requires US lenders to disclose APR. Simple interest is common for personal loans, auto loans, and some student loans. Mortgage loans typically use compound interest with monthly compounding.
United Kingdom (UK): The FCA requires clear APR disclosure for all regulated loans. Simple interest is used for many personal loans and some car finance agreements. Mortgage loans in the UK typically use compound interest with monthly or annual rest.
For debt payoff strategies, debt consolidation, or debt-to-income ratio analysis, see our specialized calculators in the Loan Tools category.
Frequently Asked Questions
What is the simple interest formula for calculating debt cost?
Simple interest is calculated using the formula: Total Interest = Principal x Rate x Time / 100. For example, a debt of ₹1,00,000 at 10% annual interest for 5 years costs ₹50,000 in interest, making the total repayment ₹1,50,000.
How does simple interest differ from compound interest on debt?
Simple interest is calculated only on the original principal, so interest costs grow linearly over time. Compound interest is calculated on the principal plus accumulated interest, causing costs to grow exponentially. Most credit cards and mortgages use compound interest, while some personal loans and bonds use simple interest.
Is this debt cost calculator free to use?
Yes, this calculator is completely free to use. There are no registration requirements, hidden fees, or usage limits. You can calculate as many scenarios as you need and share results via the automatically generated URL.
What is the difference between total debt cost and EMI?
Total debt cost is the sum of principal and all interest paid over the entire loan period. EMI (equated monthly installment) divides this total cost into fixed monthly payments. This calculator shows the total cost at maturity, while EMI calculators break costs into monthly payments.
How do I calculate the total cost of debt in India?
In India, the total cost of debt includes the principal amount borrowed plus total simple interest. For a ₹5,00,000 loan at 12% per annum for 3 years, the interest is ₹1,80,000, making the total repayment ₹6,80,000. Indian banks typically disclose this as the Annual Percentage Rate (APR) or Annual Percentage Yield (APY).
How do I calculate debt cost for US loans?
In the US, loan costs are disclosed under the Truth in Lending Act (TILA) as the APR. For a $10,000 personal loan at 7% simple interest for 5 years, the total interest is $3,500, making the total repayment $13,500. Note that most US mortgages use compound interest, so actual costs may differ.
How is debt cost calculated in the UK?
In the UK, lenders must display the Annual Percentage Rate (APR) under FCA regulations. For a £8,000 loan at 6% simple interest over 5 years, the total interest is £2,400, making total repayment £10,400. UK loans may use either simple or compound interest depending on the lender and loan type.
Can I use this calculator for comparing different loan offers?
Yes, this calculator helps compare multiple loan offers by showing the total interest cost and total repayment amount for each. Enter the principal, rate, and tenure for each offer separately to see which one costs least. However, always check if the loan uses simple or compound interest for an accurate comparison.