The base for practical business calculations

Free online calculators for VAT, profit margins, markup, discounts, and break-even analysis. Accurate, fast, and built for professionals.

Try the VAT Calculator

All Calculators

Choose a calculator to get started — all free, no signup required.

VAT & Tax

VAT Calculator

Add or remove VAT from any amount instantly. Supports UK, EU, and international VAT rates.

Add VAT Calculator

Quickly add VAT to any net amount. See the VAT amount and gross total instantly.

Remove VAT Calculator

Extract VAT from a gross price. See the original net amount and VAT paid.

Pricing

Margin Calculator

Calculate profit margin from revenue and cost. See profit and margin percentage.

Markup Calculator

Calculate markup percentage from cost and selling price, or find the selling price from a target markup.

Discount Calculator

Calculate the discount amount and final price after applying a percentage discount.

Margin to Markup Converter

Convert between margin and markup instantly. See the equivalent percentage and a full conversion table.

Business

Break-even Calculator

Find out how many units you need to sell to cover your costs and start making profit.

Why CalcBase?

Instant Results

Calculations update in real time as you type. No page reloads, no waiting.

Accurate & Transparent

Every calculator shows the formula used and step-by-step breakdowns so you can verify results.

International Support

Built-in VAT rates for the UK, EU, Australia, Canada, and more. Works for any currency.

Built for Business

Focused on the calculations businesses actually need — margins, markup, VAT, and break-even analysis.

Powerful Features

More than a calculator — tools designed for how you actually work.

Shareable Links

Share any calculation with pre-filled values. Recipients see exactly what you calculated.

Export to PDF & CSV

Download results as a professional PDF summary or a spreadsheet-ready CSV file.

Calculation History

Your recent calculations are saved locally so you can quickly revisit them from the search bar.

Learn the Fundamentals

Short, practical guides that explain the formulas and concepts behind each calculator.

VAT Explained

What VAT is, how it works, and how it differs from sales tax.

Margin vs Markup

The crucial difference and why confusing them costs money.

How to Calculate Discount

Percentage discounts, stacking, and reverse calculations.

Break-even Formula

Fixed costs, variable costs, and finding your break-even point.