Business Calculators
Profit margin, GST, discount & business tools.
What Are Business Calculators?
Business calculators help founders, managers, accountants, and sales teams cut through the arithmetic of daily commercial decisions and get to the numbers that actually matter. Whether you are pricing a product for the first time, evaluating whether a new hire pays for themselves, calculating the tax component on an invoice, or projecting how long your current cash reserves will last, the right business calculator delivers a precise answer in seconds.
Profit and pricing are where most business calculations begin. Gross profit margin, net profit margin, and contribution margin each measure profitability at a different level — gross margin strips out direct costs, net margin accounts for all overheads and taxes, and contribution margin isolates the amount each unit sold contributes to covering fixed costs. Knowing all three helps you set prices that are competitive, sustainable, and profitable simultaneously.
Sales tax and compliance calculations are a daily reality for every business. GST, VAT, and sales tax calculators handle the two most common tasks: adding tax to a net price to get the gross amount you should charge, and working backwards from a gross amount to extract the tax component. Errors here are costly — either you overcharge customers and damage trust, or you undercharge and absorb the tax liability yourself.
Break-even analysis answers one of the most important questions in business planning: at what level of sales do I stop losing money? The break-even point is reached when total revenue equals total costs — fixed costs plus variable costs per unit multiplied by units sold. Every price change, cost reduction, or volume increase shifts the break-even point, and a calculator lets you model these scenarios in real time.
Business metrics such as customer acquisition cost (CAC), customer lifetime value (CLV), churn rate, burn rate, and conversion rate are the language of modern business performance. These KPIs appear in investor decks, board reports, and weekly reviews — and our calculators let you compute them instantly from the raw numbers in your CRM, P&L, or analytics dashboard.
Whether you run a sole trader operation, a growing e-commerce brand, or a multi-entity enterprise, these business calculators provide the quantitative foundation for better decisions across pricing, operations, tax, and strategy.
All Business Calculators (35)
GST Calculator
Calculate GST inclusive and exclusive amounts for any tax rate instantly.
Profit Margin Calculator
Calculate gross and net profit margins for your products and services.
Discount Calculator
Calculate the final price after discount, or find the original price.
Break-even Calculator
Calculate break-even point in units and revenue for any product or business.
VAT Calculator
Add or remove VAT from any price. Calculate VAT amount and net/gross price instantly.
Sales Tax Calculator
Calculate sales tax amount and total price for any US state or custom tax rate.
Markup Calculator
Calculate selling price, markup percentage, or cost price for any product.
Commission Calculator
Calculate sales commission earnings for flat rate, tiered, and split commission structures.
Revenue Calculator
Calculate total revenue, average revenue per unit, and revenue growth rate.
Inventory Calculator
Calculate inventory value, reorder point, economic order quantity (EOQ), and stock turnover.
Salary Calculator
Convert salary between hourly, daily, weekly, monthly, and yearly amounts.
Overtime Calculator
Calculate overtime pay for weekly, daily, or double-time overtime rates.
Payroll Calculator
Calculate employee net pay after federal tax, state tax, Social Security, and Medicare deductions.
Invoice Calculator
Create and calculate invoices with line items, tax, discount, and due date.
Freelance Rate Calculator
Calculate your minimum freelance hourly rate based on desired income, expenses, and billable hours.
Hourly Wage Calculator
Calculate hourly wage from salary, or convert hourly pay to annual, monthly, and weekly income.
Business Loan Calculator
Calculate monthly repayment, total interest, and amortization schedule for a business loan.
Cash Flow Calculator
Calculate net cash flow, operating cash flow, and free cash flow from income and expenses.
Startup Cost Calculator
Estimate total startup costs including one-time setup costs and monthly operating expenses.
Employee Cost Calculator
Calculate the true total cost of hiring an employee including salary, benefits, taxes, and overhead.
ROAS Calculator
Calculate Return on Ad Spend (ROAS) to measure advertising campaign profitability.
CAC Calculator
Calculate Customer Acquisition Cost (CAC) from your total marketing and sales spend.
Customer Lifetime Value Calculator
Calculate CLV/LTV to understand long-term revenue per customer.
Churn Rate Calculator
Calculate customer churn rate, retention rate, and revenue churn for your business.
Conversion Rate Calculator
Calculate conversion rate, conversions needed, and revenue impact of rate changes.
CPM Calculator
Calculate CPM (Cost Per Mille) for advertising campaigns and media buys.
CPC Calculator
Calculate Cost Per Click (CPC) for PPC and digital advertising campaigns.
CPA Calculator
Calculate Cost Per Acquisition (CPA) for marketing campaigns and ad spend.
Ecommerce Profit Calculator
Calculate net profit, margin, and ROI for ecommerce products after all fees and costs.
Shopify Fee Calculator
Calculate Shopify transaction fees, payment processing costs, and net profit per sale.
Amazon FBA Calculator
Calculate Amazon FBA fees, net profit, and ROI for any product listing.
Etsy Fee Calculator
Calculate Etsy listing, transaction, and payment processing fees and net profit.
eBay Fee Calculator
Calculate eBay final value fees, PayPal fees, and net profit for any listing.
Return Rate Calculator
Calculate product return rate, cost of returns, and impact on net revenue.
Inventory Turnover Calculator
Calculate inventory turnover ratio, days inventory outstanding, and stock efficiency.
Business Calculator Guides
Profit & Pricing
Gross profit margin is calculated as (Revenue − Cost of Goods Sold) ÷ Revenue × 100. Net profit margin uses net profit after all expenses and taxes: Net Profit ÷ Revenue × 100. Mark-up, often confused with margin, is calculated on cost rather than selling price: (Selling Price − Cost) ÷ Cost × 100. Understanding the difference is essential — a 50% mark-up produces a 33% gross margin, not 50%.
Discount calculators help sellers quickly verify that a promotional price still achieves the required margin, while commission calculators show sales teams exactly what they will earn at different deal sizes and commission rates. Use these tools together when building a pricing strategy that satisfies both the customer and the income statement.
Tax & Compliance
GST and VAT calculators handle the most common compliance arithmetic: adding the applicable tax rate to a net price, or stripping it from an inclusive gross price. For a net amount N with tax rate r%, the gross is N × (1 + r/100). To extract tax from an inclusive price G, the net is G ÷ (1 + r/100) and the tax component is G − [G ÷ (1 + r/100)].
Payroll and self-employment tax calculators are equally important for business owners who need to budget accurately for employer contributions and understand the real cost of each employee beyond the headline salary figure. Use these alongside the salary and take-home pay calculators to model total compensation accurately.
Break-Even & Business Analysis
The break-even formula is Break-Even Units = Fixed Costs ÷ (Selling Price − Variable Cost per Unit). In revenue terms: Break-Even Revenue = Fixed Costs ÷ Gross Margin %. These calculations are essential for launch planning, pricing decisions, and evaluating the impact of cost changes. A business that knows its break-even point can set realistic sales targets and understand exactly how much buffer it has.
Burn rate, runway, and CAC calculators extend business analysis into the operational and strategic realm — particularly important for startups and growth-stage companies. Burn rate tells you how fast you are spending cash reserves; runway tells you how many months you have left; CAC tells you how much it costs to acquire each new customer. Together they answer the fundamental question: is this business model sustainable?
Top Business Calculators
Profit Margin Calculator
Calculate gross and net profit margins for any product or service and check whether your pricing strategy is sustainable.
GST Calculator
Add or extract GST, VAT, or any sales tax from a price — with separate display of net, tax, and gross amounts for invoicing.
Break-Even Calculator
Find the minimum sales volume needed to cover all fixed and variable costs at your current price point.
Discount Calculator
Calculate the final price after any percentage discount and verify the resulting margin before running a promotion.
CAC Calculator
Measure how much it costs to acquire each new customer and compare it against lifetime value to assess growth sustainability.
Key Formulas & References
Gross Profit Margin
(Revenue − COGS) ÷ Revenue × 100
COGS = Cost of Goods Sold; result is expressed as a percentage
Break-Even Units
Fixed Costs ÷ (Selling Price − Variable Cost)
Number of units that must be sold to cover all costs
Mark-Up
(Selling Price − Cost) ÷ Cost × 100
Percentage added to cost price to arrive at selling price
GST / VAT (Add)
Gross = Net × (1 + Tax Rate ÷ 100)
To calculate the tax-inclusive price from a net amount
Frequently Asked Questions About Business Calculators
Markup is calculated as a percentage of cost: (Selling Price − Cost) ÷ Cost × 100. Margin is calculated as a percentage of revenue: (Selling Price − Cost) ÷ Selling Price × 100. A 50% markup produces a 33.3% margin. Confusing the two is a common pricing error that can result in products that appear profitable but actually erode margins.
Break-even units = Fixed Costs ÷ (Selling Price per Unit − Variable Cost per Unit). In revenue terms: Break-even Revenue = Fixed Costs ÷ Gross Margin %. Once you know your break-even point, you can set meaningful sales targets and understand the margin of safety at any given sales volume.
To add GST/VAT to a net price: Gross = Net × (1 + Tax Rate ÷ 100). To extract GST/VAT from a tax-inclusive price: Net = Gross ÷ (1 + Tax Rate ÷ 100); Tax = Gross − Net. Our GST and VAT calculators handle both directions instantly and display the tax component separately for invoicing.
Gross profit margin = (Revenue − COGS) ÷ Revenue × 100. It measures profitability before overheads. Net profit margin = Net Profit ÷ Revenue × 100. It measures what is left after all expenses, interest, and taxes. A healthy gross margin with a thin net margin usually indicates excessive overhead costs.
CAC = Total Sales and Marketing Costs ÷ Number of New Customers Acquired in the same period. Compare CAC against customer lifetime value (CLV) to assess whether your acquisition economics are sustainable. A CLV:CAC ratio of 3:1 or higher is generally considered healthy for a growing business.
Burn rate is the rate at which a business spends its cash reserves, typically measured monthly. Net burn = Cash spent − Cash received per month. Runway (in months) = Current Cash Balance ÷ Net Monthly Burn Rate. These are critical metrics for startups managing their path to profitability or a funding round.
Business calculators on BrainyCalculators are designed as planning, estimation, and educational tools. They use standard formulas and are suitable for internal analysis and quick checks. For statutory accounting, tax filings, and audited financial statements, always work with a qualified accountant or use HMRC/IRS-approved software.
Tax calculators use the published standard rates and thresholds for the relevant jurisdiction. Results are estimates — actual tax liability depends on individual circumstances, allowances, reliefs, and any changes to legislation that may not yet be reflected in the tool. Always verify with HMRC, IRS, or a qualified tax adviser before filing.
BrainyCalculators Editorial Team
Our Business calculators are researched, built, and reviewed by the BrainyCalculators editorial team using industry-standard formulas and validated against authoritative references. Results are updated whenever underlying standards, rates, or guidelines change. All calculators are free, require no account, and run entirely in your browser.