Terms and Conditions

Effective date 1 November 2026

These terms apply to your use of the Margin Guru website and supplement the licence that applies to your use of the Margin Guru app. The website and app are provided by Duncan Promnitz, operating as Margin Guru.

1. App Store licence

For downloads from the App Store, Apple’s Standard Licensed Application End User License Agreement governs your app licence. These terms cover how you use Margin Guru and its website. If there is a conflict concerning your App Store licence, Apple’s standard agreement controls. Margin Guru provides app support.

2. Using the calculator

Margin Guru estimates selling prices, profit, margins and markups from the inputs and settings you choose. Results depend on your inputs, tax treatment, discounts, rounding and currency settings. Review the figures and the rules that apply to your business before using a result in a price, invoice, tax return or business record.

The calculator provides general information. It does not provide accounting, tax, legal or financial advice. Seek advice from a qualified professional when you need help applying those rules to your circumstances.

3. Acceptable use and ownership

You may use the app for personal or internal business purposes in accordance with the applicable licence and law. You must not interfere with the website or its security, submit malicious or unsolicited content through support, or use the service to infringe another person’s rights.

You retain any rights you have in the figures and other information you enter. Margin Guru and its licensors retain their rights in the app, website, branding and content. Third-party materials remain subject to their applicable licences.

4. Availability, warranties and liability

We aim to keep Margin Guru available and accurate. To the extent permitted by applicable law, we do not guarantee uninterrupted availability, error-free operation or suitability for a particular business decision. To the extent permitted by law, we are not responsible for losses caused by incorrect inputs or for indirect or consequential losses arising from use of the app or website.

These terms preserve any rights, guarantees and remedies you have under applicable consumer law. Nothing in these terms excludes or limits liability where the law prohibits doing so.

5. Changes, privacy and support

We may update the app, website and these terms as features or legal requirements change. We will publish updated terms with a new effective date and give additional notice where required by law.

Our Privacy Policy explains how we handle information. For help or questions about these terms, visit Support.