Website support & corrections
Report a calculation issue, broken link, accessibility problem or unclear instruction.
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Business Enquiries & Partnerships
For business partnerships, advertising, brand collaborations, affiliate opportunities and other commercial enquiries, use the secure form below. Please share only the information needed for us to review your proposal.
Submitting this form sends your enquiry to Friendly Calculator through HubSpot. Do not include passwords, payment details, government ID numbers or other sensitive information. See our Privacy Policy.
Business & partnerships
For advertising, sponsorship, affiliate proposals, calculator widgets and custom tool enquiries. All proposals are reviewed; no partnership is implied until confirmed in writing.
Send a business enquiryAPI access
Read the API documentation before requesting access. API access is limited and subject to review; do not send API keys or passwords in an enquiry.
Read API documentationCustom calculator development
For a calculator built around a business workflow, describe the required inputs, formulas, outputs and intended users in the enquiry form.
Request a custom calculatorWhat not to send
Do not submit passwords, one-time codes, payment-card details, government identity numbers, private financial records or health records through the contact form. Send only the information needed to describe your enquiry.
The homepage enquiry form is the supported contact channel. It sends only the details you choose to submit. Please review our Privacy Policy and Terms of Use.