Free Business & Invoicing Calculators
Free calculators for profit margin, markup, VAT, break-even, freelance rates, invoice totals and more. Instant results, no sign-up.
Profit Margin Calculator
Calculate your profit margin, gross profit, and markup from revenue and cost. Free, instant, no sign-up.
Open calculator →Markup Calculator
Turn a cost + markup percentage into a selling price, and see the resulting profit margin. Free and instant.
Open calculator →Gross Profit Calculator
Calculate gross profit and gross margin from revenue and cost of goods sold (COGS). Free, no sign-up.
Open calculator →Break-Even Calculator
Find how many units you must sell to cover your costs. Enter fixed costs, price, and variable cost per unit.
Open calculator →Freelance Hourly Rate Calculator
Work out the hourly rate you need to charge from your target income, billable hours, and weeks worked.
Open calculator →VAT Calculator
Add VAT to a net amount or remove VAT from a gross amount at any rate. Free, instant VAT calculator.
Open calculator →Sales Tax Calculator
Calculate sales tax and the total price from a subtotal and tax rate. Free, instant, no sign-up.
Open calculator →Discount Calculator
Work out the final price and how much you save after a percentage discount. Free and instant.
Open calculator →Invoice Total Calculator
Add tax and a discount to a subtotal to get the invoice total your client owes. Free, instant.
Open calculator →Late Fee Calculator
Calculate the late fee on an overdue invoice from the amount, monthly interest rate, and days overdue.
Open calculator →Net Profit Margin Calculator
Calculate net profit and net profit margin from total revenue and total expenses. Free, instant.
Open calculator →ROI Calculator
Calculate return on investment (ROI) percentage from your gain and cost. Free, instant, no sign-up.
Open calculator →Payment Due Date Calculator
Work out an invoice due date from the issue date and payment terms (net 15/30/60/90 or custom). Free, instant.
Open calculator →Timesheet / Time Card Calculator
Add up hours worked from a start time, end time, and break, and get the pay owed. Free time card calculator.
Open calculator →Currency Converter
Convert an amount between currencies at live exchange rates. Free, instant currency converter for invoices.
Open calculator →Overtime Pay Calculator
Work out overtime pay from your hourly rate, overtime hours, and multiplier (1.5×, 2×). Free, instant.
Open calculator →Self-Employment Tax Calculator
Estimate US self-employment tax (Social Security + Medicare) on your net freelance income. Free, instant.
Open calculator →Salary to Hourly Rate Calculator
Convert an annual salary into an equivalent hourly rate from your hours and weeks worked. Free, instant.
Open calculator →Hourly Rate to Salary Calculator
Convert an hourly rate into an equivalent annual salary from your hours and weeks worked. Free, instant.
Open calculator →Day Rate Calculator
Work out the day rate to charge from a target income — annual, monthly, weekly, or daily — and your billable days. Free, instant.
Open calculator →GST Calculator
Add GST to a net price or remove GST from a gross price at any rate (10%, 15%, 18%). Free, instant.
Open calculator →UK VAT Calculator
Add or remove UK VAT at 20% (or 5% reduced) to find the net, VAT, and gross amount. Free, instant.
Open calculator →Business Days Calculator
Count the working days (Mon–Fri) between two dates — useful for payment terms and deadlines. Free, instant.
Open calculator →Cash Flow Calculator
Work out net cash flow and your closing balance from cash in, cash out, and an opening balance. Free, instant.
Open calculator →Sales Commission Calculator
Calculate commission earned from a sale amount and commission rate, plus total pay with a base. Free, instant.
Open calculator →Invoice Number Generator
Generate the next sequential, professional invoice number with a custom prefix and padding. Free, instant.
Open calculator →Payment Processing Fee Calculator
Work out the card processing fee and what you actually receive from a payment. Set any percentage + fixed fee. Free, instant.
Open calculator →Take-Home Pay Calculator
Estimate your take-home pay after tax and deductions from your gross income and effective rate. Free, instant.
Open calculator →Cash Runway Calculator
Find how many months of runway you have from your cash on hand and monthly net burn. Free, instant.
Open calculator →Billable Hours & Utilisation Calculator
Work out your utilisation rate and billable revenue from your total and billable hours. Free, instant.
Open calculator →Project Profit Calculator
Work out the profit and margin on a project from its price, labour, and other costs. Free, instant.
Open calculator →Client Profitability Calculator
See how profitable a client really is from the revenue they bring and your cost to serve them. Free, instant.
Open calculator →Customer Acquisition Cost (CAC) Calculator
Calculate your customer acquisition cost from total sales & marketing spend and new customers. Free, instant.
Open calculator →Customer Lifetime Value (LTV) Calculator
Estimate customer lifetime value from average revenue, gross margin, and customer lifespan. Free, instant.
Open calculator →LTV:CAC Ratio Calculator
Calculate your LTV to CAC ratio to check whether your unit economics work. Free, instant.
Open calculator →Conversion Rate Calculator
Calculate your conversion rate from conversions and total visitors or leads. Free, instant.
Open calculator →Average Order Value (AOV) Calculator
Calculate your average order value from total revenue and number of orders. Free, instant.
Open calculator →MRR & ARR Calculator
Calculate monthly and annual recurring revenue from your customers and average monthly price. Free, instant.
Open calculator →Churn Rate Calculator
Calculate your customer churn rate and retention rate from customers lost and starting customers. Free, instant.
Open calculator →ROAS Calculator
Calculate your return on ad spend (ROAS) from ad revenue and ad spend. Free, instant.
Open calculator →Turn the number into an invoice
Once you’ve worked out your price, create a professional invoice in one sentence with Aviy’s free AI invoice generator.
Create an invoice free