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Put a calculator on your own site

One line of HTML. No account, no fees.

Every calculator here works inside your page. Copy a snippet, paste it where you want the tool, and it runs in your visitor's browser exactly as it does on this site.

27 free tools
No signup, ever
Nothing stored
No watermark

How it works

Pick a tool, copy its snippet, paste it into your page. The embedded version drops the site header and footer so only the tool shows, keeps a small link back in the corner, and needs nothing from you: no key, no account, no script to maintain. Change the height in the snippet if your layout wants a different one.

The 17 calculators

Invoice Calculator

Totals, tax and discounts on one invoice

<iframe src="https://invoicetools.com/invoice-calculator/?embed=1" width="100%" height="560" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Invoice Calculator"></iframe>

Sales Tax Calculator

Add tax to a price or pull it back out

<iframe src="https://invoicetools.com/sales-tax-calculator/?embed=1" width="100%" height="620" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Sales Tax Calculator"></iframe>

VAT Calculator

UK and EU rates, both directions

<iframe src="https://invoicetools.com/vat-calculator/?embed=1" width="100%" height="560" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="VAT Calculator"></iframe>

Markup Calculator

Cost to price, and the margin it leaves

<iframe src="https://invoicetools.com/markup-calculator/?embed=1" width="100%" height="540" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Markup Calculator"></iframe>

Profit Margin Calculator

What a job actually returns

<iframe src="https://invoicetools.com/profit-margin-calculator/?embed=1" width="100%" height="560" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Profit Margin Calculator"></iframe>

Break-Even Calculator

Units and revenue needed to cover costs

<iframe src="https://invoicetools.com/break-even-calculator/?embed=1" width="100%" height="580" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Break-Even Calculator"></iframe>

Freelance Rate Calculator

An hourly rate that pays the bills

<iframe src="https://invoicetools.com/freelance-rate-calculator/?embed=1" width="100%" height="620" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Freelance Rate Calculator"></iframe>

Service Price Calculator

Price a job from labour and materials

<iframe src="https://invoicetools.com/service-price-calculator/?embed=1" width="100%" height="640" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Service Price Calculator"></iframe>

Percentage Calculator

Every common percentage question

<iframe src="https://invoicetools.com/percentage-calculator/?embed=1" width="100%" height="540" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Percentage Calculator"></iframe>

Discount Calculator

Sale price, saving, and stacked discounts

<iframe src="https://invoicetools.com/discount-calculator/?embed=1" width="100%" height="540" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Discount Calculator"></iframe>

Salary Calculator

Take-home pay across all fifty states

<iframe src="https://invoicetools.com/salary-calculator/?embed=1" width="100%" height="680" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Salary Calculator"></iframe>

Loan Calculator

Payment, interest and the full schedule

<iframe src="https://invoicetools.com/loan-calculator/?embed=1" width="100%" height="640" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Loan Calculator"></iframe>

Tip Calculator

Tip, total and the split per person

<iframe src="https://invoicetools.com/tip-calculator/?embed=1" width="100%" height="560" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Tip Calculator"></iframe>

Concrete Calculator

Volume and bags for slabs and footings

<iframe src="https://invoicetools.com/concrete-calculator/?embed=1" width="100%" height="620" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Concrete Calculator"></iframe>

Paint Calculator

Litres and coats for a room or exterior

<iframe src="https://invoicetools.com/paint-calculator/?embed=1" width="100%" height="620" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Paint Calculator"></iframe>

Late Fee Calculator

Interest on an overdue invoice

<iframe src="https://invoicetools.com/late-fee-generator/?embed=1" width="100%" height="660" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Late Fee Calculator"></iframe>

Cost Estimator

Build a job estimate line by line

<iframe src="https://invoicetools.com/cost-estimator/?embed=1" width="100%" height="720" style="border:1px solid #e8e4dc;border-radius:14px" loading="lazy" title="Cost Estimator"></iframe>

Common questions

Can I put a calculator on my own website?

Yes. Copy the iframe for the tool you want and paste it into your page. It needs no account, no key and no payment, and it keeps working as the tool is updated.

Does the embedded calculator send data anywhere?

No. Embedded tools run in your visitor's browser exactly as they do here, so nothing your visitors type is sent to a server.

Can I change the height of the embed?

Yes. Each snippet carries a height that suits that tool; change the number to fit your layout. Width is set to 100% so it fills whatever column you put it in.

What does the small link in the corner do?

It says the tool was built with InvoiceTools and links back to the full version. It is the only thing we ask in return for the embed being free.