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Business Calculators

Quick calculations for everyday business decisions. No sign-up, no downloads, completely free.

GST / Tax Calculator

Calculate GST or sales tax on amounts

Results

Net Amount (excl. GST) $0.00
Tax Amount $0.00
Total (incl. GST) $0.00

Markup vs Margin Calculator

Calculate markup percentage, margin percentage, and profit

Markup is the percentage added to cost price. Margin is the percentage of selling price that is profit. Both calculate profit, but from different perspectives.

Cost: $0
Profit: $0

Results

Profit Amount $0.00
Markup Percentage 0%
Margin Percentage 0%

Break-Even Calculator

Calculate the sales volume needed to cover all costs

Break-even point is where total revenue equals total costs (fixed + variable). You need to sell this many units to start making profit.

Results

Break-Even Units 0
Break-Even Revenue $0.00
Contribution Margin per Unit $0.00
Contribution Margin Ratio 0%

Loan Repayment Calculator

Calculate monthly payments and total interest on a loan

Results

Monthly Payment $0.00
Total Interest $0.00
Total Repayment $0.00

First Payment

$0.00
Principal

First Payment

$0.00
Interest

Last Payment

$0.00
Principal

Last Payment

$0.00
Interest

Open a calculator on its own page

Each calculator also has its own page with a full explainer and FAQ — handy for bookmarking or sharing.

Bitcoin Rainbow Chart

Power-law bands · live data

 XRP Rainbow Chart

Same model, weaker fit

 ⏱️ Timesheet Calculator

Start and finish times to decimal hours

 🔍 ABN Checker

Validate an ABN and check your tax invoice

 📅 BAS Due Dates

Lodgement dates with a calendar download

 🧮 GST Calculator

Add or remove GST from any amount

 📈 Markup vs Margin Calculator

Convert between markup and margin

 ⚖️ Break-Even Calculator

Units and revenue needed to cover costs

 🏦 Loan Repayment Calculator

Repayments, interest and total cost

Related Tools & Guides

🧾 Free Invoice Generator

GST-ready invoices, no signup

 💰 Accounting & Finance Tools

Cash flow, expenses, budgeting

 💸 Freelance Rate Calculator

Work out your hourly and day rate

 📘 GST for Small Business Australia

Complete GST guide
  • Switch Calculators: Click the tabs at the top to switch between GST/Tax, Markup vs Margin, Break-Even, and Loan Repayment calculators.
  • GST Calculator: Enter an amount, choose "Add GST" or "Remove GST", and select a tax rate preset or enter a custom rate. Results update instantly.
  • Markup vs Margin: Enter your cost and selling price to see both markup percentage and margin percentage side by side. Understand the difference for better pricing.
  • Break-Even Analysis: Enter your fixed costs, price per unit, and variable cost per unit to find how many units you need to sell to break even.
  • Loan Calculator: Enter the loan amount, interest rate, and term to see your monthly payment, total interest, and amortisation breakdown.
  • Real-Time Results: All calculators update as you type — no need to click a "Calculate" button.
  • Copy Results: Use the Copy button (where available) to quickly copy calculated values to your clipboard.
  • No Data Stored: These calculators don't save any data. They run entirely in your browser for privacy.