Financial Calculators
Compare income, interest, tax and financial scenarios with browser calculators. Choose the calculation you need and inspect its inputs and assumptions.
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Use these financial calculators to model amounts for a legal matter, financial investigation or your practice. Start with the question you need to answer, then choose a calculator below.
Find the Calculation You Need
For income and household expenses, choose a calculator that matches the amount you need to estimate, such as take-home pay or childcare costs. Interest and loan calculators help you compare borrowing costs or the effect of time on an amount.
Case-related calculations cover financial scenarios such as dividing a property pool or comparing a proposed support amount with income and expenses. Practice calculations help you work through fees and charge-out rates. General arithmetic tools suit percentage changes, date intervals and statistical summaries.
Choose by the financial question in your casework:
- Value a payment stream: enter future amounts, timing and a discount rate to estimate their present value.
- Reconcile liabilities: enter the balance, rate and payment assumptions to compare loan or interest amounts with the records.
- Model a settlement: enter the asset pool, liabilities and proposed allocation to compare the amounts each person would retain.
- Test a financial assumption: change an income, expense, tax or inflation input and compare its effect on the result.
For financial planning within a matter, these online calculators make the arithmetic and assumptions visible. Use the relevant records to choose the entries, then retain the inputs with the result. The calculation helps test a scenario. Personal investment recommendations require a separate assessment of the person’s circumstances.
Each calculator explains its inputs and assumptions, with the records needed to interpret its result. Read those details before entering figures, and keep the assumptions with your calculation when comparing scenarios.
The results are arithmetic estimates. Courts and agencies make decisions under the rules that apply to the matter, while advisers assess how those rules affect your circumstances.
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40 calculators
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- Child Support Calculator
Estimate Australian child support from income, care percentages and children’s details, with the formula steps and multi-case assumptions shown.
- Divorce Superannuation Calculator
Model superannuation splitting from fund balances, a base amount or a percentage. Compare each party’s balance and check preservation age separately.
- Property Settlement Calculator
Enter assets, debts and proposed percentages to compare divorce asset splits, equalisation payments and the amount each party would retain.
- Spousal Maintenance Calculator for Australia
Compare income and expenses to model a spousal maintenance shortfall, payment capacity and weekly or monthly scenarios for an Australian matter.
More calculators
- Compound Interest Calculator
Calculate compound interest from a starting balance, rate and regular deposits, then compare compounding periods and the effective annual return.
- Car Loan Repayment Calculator
Calculate your car loan repayments from the amount, rate, term and balloon. Compare interest, periodic payments and remaining debt in a saved schedule.
- Child Care Subsidy Calculator
Enter income and childcare fees to estimate your Child Care Subsidy percentage, eligible subsidy and out-of-pocket cost. Compare care scenarios.
- Budget Planner
Build a weekly, fortnightly or monthly budget from your income and expenses, compare a household shortfall and export the completed planner.
- YTD Calculator
Annualise year-to-date income from your dates and pay figures. Compare weekly, fortnightly and monthly amounts with the period and assumptions visible.
- Inflation Calculator
Adjust a historic amount for Australian inflation, compare CPI periods or reverse the calculation, and see the index values behind the result.
- Redundancy Calculator
Estimate redundancy pay from service and ordinary pay, compare statutory or entered scheme terms, and separate the gross amount from tax treatment.
- Standard Deviation Calculator With Outlier Tests
Paste amounts to calculate sample or population standard deviation, inspect z scores and flag outliers with the formula and row-level results shown.
- Division 7A Loan Calculator
Calculate Division 7A minimum yearly repayments from your loan balance and term, then compare recorded repayments with an entered-rate scenario.
- Present Value Calculator
Discount a future payment or annuity to present value, compare rates and terms, and inspect a net present value schedule with the assumptions visible.
- Super Guarantee Charge Calculator
Estimate super guarantee contributions and a modelled late-payment charge from earnings, periods and payments, with each assumption and component visible.
- Damages Calculator
Calculate a commercial damages schedule from expected and actual receipts, avoided costs and mitigation. Export the amounts and assumptions for review.
- Small Business Valuation Calculator
Enter normalised earnings, a multiple, cash and debt to model small business value. Compare assumptions and export the calculation for review.
- GST Margin Scheme Calculator
Enter the property sale price and eligible acquisition basis to calculate margin scheme GST, compare the margin and check net sale proceeds.
- Granny Flat Interest Calculator
Model a granny flat interest from the accommodation payment and age inputs, and see how the published reasonableness-test assumptions affect it.
- Audit Sample Size Calculator
Estimate an audit sample size from your population, confidence and error assumptions, with the method, rounding and calculation steps visible.
- Liquidated Damages Calculator
Enter a contractual rate, counted period and cap. Calculate liquidated damages and export assumptions separately from legal entitlement.
- File Hash Checker
Check a file’s SHA-256 hash in your browser and compare it with a recorded digest. Keep the file on your device and understand what a match proves.
- Mortgage Repayment Calculator
Enter a mortgage balance, rate and term to compare repayments, extra payments and an offset account, with a clear loan amortisation schedule.
- Percentage Calculator
Calculate a percentage, increase or difference from your amounts, reverse a percentage to find the starting value and follow the formula steps.
- Stamp Duty Calculator
Estimate stamp duty by state or territory from the asset value and transaction type, including supported property concessions and vehicle transfers.
- Income Tax Calculator
Estimate Australian income tax from taxable income and the selected year, compare after-tax amounts and see marginal and effective tax rates.
- Super Calculator: Balance and Retirement Income
Project your super balance from contributions, fees and return assumptions. Compare retirement income and target balances with this super calculator.
- Date Calculator for Days and Legal Time Windows
Count days between dates, add a period or calculate Australian business days, with holiday and supported legal-window assumptions shown.
- Capital Gains Tax Calculator
Estimate a capital gain from sale proceeds and cost base, compare supported property, share or crypto scenarios and see the tax assumptions used.
- Centrelink Calculator
Estimate your Centrelink payments from household income, assets and children. Compare fortnightly scenarios and see how the public means tests apply.
- IBAN Checker
Check an international IBAN’s format, length and checksum locally. Find entry errors without claiming the account exists or belongs to anyone.
- Legal Aid Means Test Calculator
Enter income, assets and household details for the supported NSW legal aid means test, with financial thresholds and assumptions shown.
- Business Income Tax Calculator
Estimate business income tax from company taxable income and the selected income year, with rate eligibility, tax and after-tax profit shown.
- Super Death Benefit Tax Calculator
Estimate super death benefit tax from recipient status and fund components. Compare direct and estate payments under Australian tax rules.
- ABN Validator and ACN Check
Validate an ABN or check an ACN’s digits on your device, identify format errors and distinguish a valid checksum from a current registration.
- Probate Fees Calculator
Estimate probate filing fees from estate value and jurisdiction, including supported NSW and Victorian schedules, with scale costs shown separately.
- Merchant Category Code Lookup
Look up merchant category codes and search MCC descriptions locally. Interpret the business category without treating it as proof of merchant or purchase.
- GST Calculator
Add or remove Australian GST from an amount, reverse a GST-inclusive total and see the tax-exclusive value, GST component and final total.
- Hourly Rate Calculator
Convert salary to an hourly rate, model a contractor charge-out rate and compare billable hours, practice costs and margin from your own assumptions.
- Law Society CPD Tracker and Activity Log
Record your law society CPD activities, total units by category and export a reviewable activity log. Check shortfalls against your selected state rules.