Free calculators for your website

Copy one line of code and your visitors get a working calculator on your own page. Free to use on a blog, accountant, estate agent or money site. Nothing typed into a calculator leaves the visitor's browser.

Each one keeps a small "Powered by SendPay Business" link back to the full tool. See the full list of free tools.

VAT calculator

Add VAT to a price or take it out, at 20%, 5% or 0%. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/vat" title="VAT calculator" width="100%" height="340" style="border:0;max-width:520px" loading="lazy"></iframe>

UK VAT threshold checker

How close a business is to the UK VAT registration threshold. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/vat-threshold" title="UK VAT threshold checker" width="100%" height="340" style="border:0;max-width:520px" loading="lazy"></iframe>

Profit margin calculator

Profit, margin and markup from a cost and a selling price. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/profit-margin" title="Profit margin calculator" width="100%" height="300" style="border:0;max-width:520px" loading="lazy"></iframe>

Break-even calculator

How many sales a month cover your costs. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/break-even" title="Break-even calculator" width="100%" height="380" style="border:0;max-width:520px" loading="lazy"></iframe>

Invoice due date calculator

The exact due date for net 30, end of month and other payment terms. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/invoice-due-date" title="Invoice due date calculator" width="100%" height="300" style="border:0;max-width:520px" loading="lazy"></iframe>

Discount calculator

The sale price after a percentage off. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/discount" title="Discount calculator" width="100%" height="300" style="border:0;max-width:520px" loading="lazy"></iframe>

Freelance hourly rate calculator

What to charge per hour from the income you want and the hours you can bill. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/hourly-rate" title="Freelance hourly rate calculator" width="100%" height="380" style="border:0;max-width:520px" loading="lazy"></iframe>

Simple interest calculator

The interest on a sum at a yearly rate, and the total after the term. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/simple-interest" title="Simple interest calculator" width="100%" height="300" style="border:0;max-width:520px" loading="lazy"></iframe>

UK late payment interest calculator

What a UK business can claim on a late invoice: interest plus fixed compensation. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/late-payment-interest" title="UK late payment interest calculator" width="100%" height="340" style="border:0;max-width:520px" loading="lazy"></iframe>

Inflation calculator

What the same shopping costs after some years of steady inflation. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/inflation" title="Inflation calculator" width="100%" height="320" style="border:0;max-width:520px" loading="lazy"></iframe>

Card fee calculator

The fee on a card payment and what to charge to receive the full amount. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/card-fee" title="Card fee calculator" width="100%" height="380" style="border:0;max-width:520px" loading="lazy"></iframe>

Chargeback ratio calculator

A chargeback rate and how close it is to a provider's limit. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/chargeback-ratio" title="Chargeback ratio calculator" width="100%" height="380" style="border:0;max-width:520px" loading="lazy"></iframe>

Mortgage calculator

Monthly repayment and total interest from price, deposit, rate and term. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/mortgage" title="Mortgage calculator" width="100%" height="420" style="border:0;max-width:520px" loading="lazy"></iframe>

Loan repayment calculator

Monthly repayment and total interest on a loan. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/loan-repayment" title="Loan repayment calculator" width="100%" height="380" style="border:0;max-width:520px" loading="lazy"></iframe>

Savings goal calculator

How much to put away each month to reach a savings goal. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/savings-goal" title="Savings goal calculator" width="100%" height="380" style="border:0;max-width:520px" loading="lazy"></iframe>

Compound interest calculator

How a lump sum and regular savings grow with interest. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/compound-interest" title="Compound interest calculator" width="100%" height="420" style="border:0;max-width:520px" loading="lazy"></iframe>

IBAN checker

Check an IBAN is correctly formed, in the browser. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/iban-checker" title="IBAN checker" width="100%" height="300" style="border:0;max-width:520px" loading="lazy"></iframe>

Sort code checker

Check a UK sort code and account number are correctly formed. Open the full tool

<iframe src="https://www.sendpaybusiness.com/embed/sort-code-checker" title="Sort code checker" width="100%" height="300" style="border:0;max-width:520px" loading="lazy"></iframe>