Financial calculators
Loan Calculators
Repayments, interest and payoff timing on personal and instalment lending.
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Featured calculator
Loan Payment Calculator
This works for any fixed-rate instalment loan — personal, home improvement, consolidation or student. Add an optional extra monthly payment to see how much interest early repayment saves.
Understanding loans maths
Instalment loans — personal loans, consolidation loans, most secured borrowing — all use one formula: a fixed payment sized so the balance reaches zero on the final scheduled date. These calculators expose what that fixed payment hides, which is how much of it is interest and how long the debt actually lasts.
The most useful thing you can do here is model an overpayment. Even a modest extra amount each month attacks the principal directly and can remove months of interest from the end of the schedule.
All loans calculators
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Loan Calculators
Personal Loan Calculator
Repayments and total interest on an unsecured personal loan.
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Loan Calculators
Student Loan Calculator
Student loan repayments, interest and payoff timing.
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Loan Calculators
Loan Interest Calculator
Total interest cost across the life of a loan.
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Loan Calculators
Debt Payoff Calculator
Payoff date and interest saved from paying extra.
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Loan Calculators
Debt Snowball Calculator
Snowball against avalanche across several debts.
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Loan Calculators
Debt-to-Income Ratio Calculator
Front-end and back-end DTI against lender limits.
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Loan Calculators
APR Calculator
The true annualised cost of a loan once fees are included.
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Loan Calculators
Interest Rate Calculator
The implied rate behind a known payment.
Loans guides
- loan-calculatorsHow Loan Calculators Work — And What They Leave OutThe amortisation formula behind repayment calculators, and the costs most tools exclude.
- personal-loansPersonal Loan Eligibility: What Lenders Actually CheckCredit history, debt-to-income ratio, and documentation requirements, explained without jargon.
- student-loansStudent Loan Repayment: Thresholds, Interest and BalancesHow repayment is calculated, when interest accrues, and why balances can rise while you pay.
- interest-ratesHow Lenders Set Interest Rates on Consumer LoansFunding costs, risk pricing, and margin — the three inputs behind an advertised rate.
Frequently asked questions
What is the difference between the rate and the APR?
The interest rate prices the borrowing itself. APR folds compulsory fees into a single annualised figure so two offers can be compared. Enter the rate to model payments, and compare APRs when choosing between lenders.
How much does paying extra really save?
Every extra dollar reduces the balance that future interest is charged on, so the saving compounds. The loan calculator shows the revised payoff date and the interest avoided next to the standard schedule.
Are there penalties for early repayment?
Some agreements charge an early repayment or break fee, which the calculator does not know about. Check your credit agreement before overpaying a large amount.
Why does my quoted payment differ slightly?
Lenders differ on day-count conventions, fee capitalisation and rounding. Differences of a dollar or two per month are normal; large gaps usually mean a fee has been added to the principal.
Other calculator categories
- Mortgage CalculatorsPayments, amortisation, deposits and the running cost of owning a home.
- Investment CalculatorsProjected returns, contributions and long-run portfolio growth.
- Interest CalculatorsSimple and compound interest, effective rates and how balances grow.
- Retirement CalculatorsRetirement pots, contribution levels and sustainable withdrawal income.
- Tax & Income CalculatorsTake-home pay, salary conversions and estimated tax positions.
- Credit & Debt CalculatorsCard payoff timelines, consolidation maths and debt reduction strategies.
- Auto Loan CalculatorsVehicle finance payments, deposits, trade-ins and total cost of ownership.
- Insurance CalculatorsCover levels, premiums, deductibles and what a claim really costs.
- Business CalculatorsMargins, break-even points, cash flow and subscription metrics.
- Savings CalculatorsSavings goals, emergency funds and the effect of regular deposits.
Disclaimer
These calculators produce estimates for information and comparison only. Actual figures depend on the provider, fees, taxes, credit assessment and terms that apply to you. Legamoney does not provide financial advice.