Loan Calculator

Loan basics

How a loan works

A loan lets you borrow money now and repay it over an agreed period. In most standard instalment loans, each regular payment contains two parts: principal, which reduces the amount you owe, and interest, which is the lender's charge for providing the money.

The amount you borrow, the interest rate and the repayment term work together. A lower rate generally reduces the cost of borrowing. A longer term usually lowers the required monthly payment, but it can also increase the total interest paid because the balance remains outstanding for longer.

MaryGee's calculator is designed for ordinary amortising loans with regular monthly payments. Personal loans, vehicle loans and many fixed-term consumer loans often use this structure. Some products use different methods, fees or interest rules, so always check the lender's actual agreement.

The numbers

How your monthly loan payment is calculated

For a standard fixed-rate amortising loan, the payment is calculated so the balance reaches zero at the end of the chosen term. Early in the loan, interest is calculated on a larger outstanding balance, so a greater share of the payment goes to interest. As the balance falls, the interest portion normally declines and more of each payment reduces principal.

The calculator uses the loan amount, annual interest rate and number of monthly payments to estimate that scheduled payment. If the interest rate is zero, the calculation becomes much simpler: the loan amount is divided evenly across the term.

The result is a planning estimate. Actual lenders may round differently, charge daily interest, collect fees separately, add insurance or use a different first-payment date.

Trade-offs

Interest rate versus loan term

People often focus on the monthly payment because that is the amount they need to fit into their budget. But the payment alone does not tell you whether a loan is inexpensive. A long loan at a lower monthly payment can still cost considerably more in interest than a shorter loan.

When comparing loans, look at both affordability and total cost. A shorter term can reduce total interest, but only if the higher required payment leaves enough room for your other priorities and unexpected expenses. A longer term may provide useful breathing room, but it is important to understand what that flexibility costs over time.

Beyond the rate

Don't ignore loan fees

Some lenders charge origination, establishment, application, documentation or other upfront fees. A loan with a slightly lower interest rate can become less attractive once significant fees are included.

MaryGee lets you enter an upfront loan fee separately so you can keep it visible rather than hiding it inside the payment. When comparing offers, also check whether fees are paid from your own cash or added to the amount borrowed. If a fee is financed, you may end up paying interest on the fee as well.

Paying faster

How extra repayments can reduce interest

When your loan permits additional repayments without penalty, paying more than the scheduled amount can reduce the balance faster. Because future interest is calculated on a smaller balance, this can shorten the loan and lower the total interest paid.

The effect is often strongest when extra repayments begin early, but the right decision depends on your wider finances. Paying down a loan quickly may be valuable, but not if it leaves you without emergency savings or causes you to miss more important obligations.

Always check whether your lender applies additional payments directly to principal and whether prepayment fees or restrictions apply.

Shop intelligently

How to compare two loan offers

Start by comparing the same borrowing amount and the same term. Look at the interest rate, any comparison rate or APR provided in your country, upfront fees, monthly fees, early-repayment rules and the total amount payable.

Then consider flexibility. Can you make additional payments? Is there a penalty for paying the loan off early? Does the rate stay fixed? Are there optional add-ons you do not need? A lower monthly payment is useful only if the overall agreement also makes sense.

Finally, consider why you are borrowing. Financing something that supports your work or replaces an essential asset is different from taking a long-term loan for short-lived discretionary spending. The calculator can explain the cost; the decision still needs to fit your broader financial plan.

Questions

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