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Financial planning tools

Free financial calculators for everyday money decisions

Explore calculators designed to make mortgages, borrowing, saving and long-term financial planning easier to understand. Enter your own figures, compare scenarios and see how changes in rates, time and payments can affect the result.

Our finance calculators are built for planning and education. They help turn common questions—such as “What will my mortgage cost?” or “How much home could I afford?”—into transparent estimates you can review and adjust.

Choose the right financial calculator

Start with the financial decision you need to make. A payment calculator estimates a regular repayment, while an affordability calculator works backwards from income, spending and available cash. Equity and loan-to-value calculators measure the relationship between property value and secured borrowing.

Different tools can answer different parts of the same decision. When planning a home purchase, for example, you might use a mortgage calculator for repayments, an affordability calculator for budget limits and a down-payment calculator for the cash required upfront.

Finance calculator topics

Plan payments, costs, savings and financial goals

Mortgage and property

Estimate repayments, interest, affordability, deposits, refinancing costs, home equity and loan-to-value ratios.

Loans and borrowing

Understand how the loan amount, annual interest rate, repayment term and additional payments influence borrowing costs.

Savings and interest

Explore how regular contributions, compound interest, time and withdrawal assumptions can change a savings projection.

Investing and retirement

Model long-term goals using contributions, estimated returns, inflation and time horizons while recognising that returns are uncertain.

Income, tax and budgeting

Break down income and recurring costs to create clearer household budgets and test whether a financial commitment fits.

Business and currency

Compare percentages, margins, markups, exchange-rate conversions and other everyday commercial calculations.

How to get a more useful result

1

Use current, accurate inputs

Small differences in balances, rates, fees or time periods can materially affect an estimate. Replace example values with figures from your statements, budget or product documents.

2

Compare more than one scenario

Test higher and lower rates, shorter and longer terms, different payment amounts and realistic changes in income or costs. A range is often more useful than one result.

3

Review the assumptions

Check whether a calculator assumes a fixed rate, regular payment timing, constant returns or fees paid upfront. Real products can calculate costs differently.

4

Use estimates as a starting point

A calculator cannot confirm eligibility, predict investment performance or replace a lender’s illustration, regulated disclosure or personalised professional advice.

What is a financial calculator?

A financial calculator applies a defined formula or cash-flow model to the information you enter. Unlike a simple arithmetic calculator, it often accounts for time, interest rates, compounding, recurring payments or changing balances. The output can help you compare options consistently, but its usefulness depends on the accuracy of the inputs and assumptions.

Common examples include mortgage payment calculators, loan repayment calculators, compound-interest calculators, savings-goal calculators and retirement calculators. Some tools answer one focused question; others combine several calculations to show payments, total interest, balances and timelines together.

Simple interest, compound interest and amortisation

Simple interest is calculated only on the original principal. Compound interest can apply to the principal and previously accumulated interest. Amortisation gradually repays a balance through scheduled payments that usually contain both principal and interest. Understanding which method a calculator uses is essential when comparing results.

Why financial estimates can differ

A lender, bank, investment platform or tax authority may use different payment dates, compounding frequencies, fee treatments, rounding rules or eligibility criteria. Variable rates, taxes, inflation and market returns can also change over time. Treat calculator results as planning estimates and use the official documentation for a transaction-specific figure.

Frequently asked questions

Questions about financial calculators

Are these financial calculators free?

Yes. You can use the calculators and adjust the example inputs without creating an account. The results are planning estimates and not financial advice.

Are financial calculator results accurate?

The formulas can produce accurate results for the values and assumptions entered. Real-world figures may differ because of fees, changing rates, payment timing, lender methods, taxes, eligibility rules or rounding.

Which calculator should I use for a mortgage?

Use a mortgage payment calculator to estimate repayments and interest. Use an affordability calculator to assess a potential budget, an LTV calculator to measure secured borrowing against property value, and a refinance calculator to compare an existing loan with a replacement.

Can a calculator tell me whether I will be approved?

No. Approval depends on the provider’s criteria and verified information. A calculator can illustrate payments or ratios, but it cannot perform underwriting, a credit check or a full suitability assessment.

Should I enter an annual or monthly interest rate?

Follow the label on the calculator. Most consumer finance tools request an annual percentage rate and convert it internally for monthly calculations. Entering a monthly rate into an annual-rate field will produce an incorrect result.

Does a lower monthly payment always cost less?

No. A lower payment can result from extending the repayment term, which may increase total interest. Compare the total cost, fees, balance and payoff date alongside the monthly amount.