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Terms of service

Version: 1.0Last updated: 2026-04-26

The 60-second summary

  • • MEPCalc is an engineering calculation tool for qualified MEP professionals.
  • • You — the engineer using MEPCalc — remain the engineer of record on every project. MEPCalc is a tool that supports your work, not a substitute for your professional judgement.
  • • You must independently verify every calculation output before relying on it.
  • • Don't use MEPCalc for life-safety or mission-critical applications without separate professional review.
  • • If something goes wrong, our liability is capped at the fees you've paid us in the last 12 months — standard for SaaS.
  • • English law applies. UK courts have jurisdiction.
  • • Questions? support@mepcalc.com

1. About these terms

These terms of service (the "Terms") form a legally binding agreement between MEPCalc ("we", "us", "our", "MEPCalc") and the person or organisation using our service ("you", "your", the "Customer").

By creating an account, accessing the MEPCalc service, or using any output produced by it, you accept these Terms. If you do not accept them, you must not use MEPCalc.

If you are entering into these Terms on behalf of a company, firm, partnership, or other organisation, you warrant that you have authority to bind that entity, and references to "you" mean both you personally and that entity.

2. Definitions

3. Eligibility and qualified professional warranty

MEPCalc is a tool intended for use by Qualified Professionals. By using the Service, you warrant and represent that:

MEPCalc is not intended for use by members of the public, by students or trainees acting without supervision, or by anyone who lacks the technical competence to evaluate engineering calculation outputs. If you do not meet the warranty above, you must not use the Service.

4. Licence grant and acceptable use

4.1 Licence

Subject to these Terms and your payment of any applicable Subscription Fees, we grant you a non-exclusive, non-transferable, non-sublicensable, revocable licence to access and use the Service for your internal business purposes during the term of your subscription.

4.2 Restrictions

You will not, and will not permit any third party to:

4.3 Account security

You are responsible for safeguarding your account credentials and for all activity that occurs under your Account. You will notify us immediately at support@mepcalc.com if you become aware of any unauthorised access. You may not share accounts; each named user requires a separate seat.

5. Subscriptions, fees and payment

5.1 Subscription terms

The Service is provided on a subscription basis. Subscription terms (monthly, annual, or other), pricing tiers, included features, and seat counts are as set out on our pricing page at the time you subscribe, or as agreed in writing in any order form between us.

5.2 Fees and billing

You agree to pay the Subscription Fees applicable to your chosen plan. Fees are billed in advance for the relevant billing period via Stripe. All fees are exclusive of taxes; you are responsible for all sales taxes, VAT, GST, or equivalent levies imposed on the supply of the Service to you, except for taxes on our income.

5.3 Auto-renewal

Unless cancelled in accordance with section 5.5, your subscription will automatically renew at the end of each billing period at the then-current rate for your plan.

5.4 Price changes

We may change Subscription Fees on at least 30 days' notice (sent by email to your account email address). Price changes take effect at the start of your next billing period. If you do not accept the new price, you may cancel before the new price takes effect under section 5.5.

5.5 Cancellation

You may cancel your subscription at any time through the Service's billing settings, or by emailing support@mepcalc.com. Cancellation takes effect at the end of the then-current billing period; you retain access until that date. We do not provide pro-rated refunds for partial periods, except as required by law (see section 5.7).

5.6 Late payment

If a payment fails or is overdue, we may suspend your access to the Service until payment is received. Overdue amounts accrue interest at the rate of 4% per annum above the Bank of England base rate, calculated daily, until paid. We may also charge our reasonable costs of collection.

5.7 Statutory cancellation rights (consumers only)

If you are a consumer (not buying for business purposes) in the UK or EU, you have a statutory right under the Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013 to cancel within 14 days of subscribing for a full refund. By starting to use the Service within that 14-day period, you acknowledge that you waive that cancellation right for any portion of the Service already supplied. MEPCalc is intended for business and professional use; the consumer rights described in this clause are unlikely to apply to most users.

6. Customer responsibilities and Customer Data

6.1 Inputs and accuracy

You are solely responsible for the accuracy, completeness, and lawfulness of all Customer Data you input into the Service. The Service's outputs depend entirely on the inputs you provide; incorrect inputs produce incorrect outputs.

6.2 Equipment

You are responsible for obtaining and maintaining all equipment, internet access, browsers, and ancillary services required to use the Service.

6.3 Customer Data ownership

As between you and us, you retain all right, title, and interest in your Customer Data. You grant us a non-exclusive, worldwide, royalty-free licence to host, process, transmit, and display your Customer Data solely for the purpose of providing the Service to you.

6.4 Aggregate and de-identified data

We may collect, analyse, and use technical, performance, and usage data relating to the Service in aggregated and de-identified form to improve our products, develop new features, and for benchmarking and research. Such aggregated data does not identify you or your Customer Data and may be used by us during and after the term of these Terms.

6.5 Privacy

Our processing of personal data is governed by our Privacy Policy, which forms part of these Terms. Our sub-processors are listed in the Sub-Processor Register.

7. Calculation outputs and design responsibility

This section is fundamental to your use of MEPCalc and allocates risk between us. Read it carefully.

7.1 MEPCalc is a tool, not the engineer

MEPCalc is an engineering calculation tool. It is not, and does not purport to be, the engineer, designer, certifier, or specifier of any building, system, installation, or service. The Service supports your professional work; it does not replace your professional judgement, and it does not discharge any professional duty owed by you to your clients, employer, or any third party.

7.2 Verification is your responsibility

You are solely responsible for evaluating, verifying, accepting, and applying every Calculation Output. Before using a Calculation Output for any professional purpose, you must independently verify it against the relevant standards, codes, regulations, manufacturer data, site conditions, and your own engineering judgement. You agree that you will not rely solely on a Calculation Output without such verification.

7.3 Design responsibility remains with you

For any project on which you use a Calculation Output, design responsibility — including the duty to act with reasonable skill and care, the duty to comply with applicable codes and standards, and any professional indemnity exposure arising from the design — remains exclusively with you (or, where relevant, the Qualified Professional under whose direction you operate).

7.4 Standards alignment, not certification

Where MEPCalc cites or aligns to a standard (for example BS 7671, CIBSE Guides, ASHRAE Fundamentals, BS EN 12831, EN 378), the alignment is provided in good faith based on the version current at the time of release. MEPCalc does not warrant that any output is certified by, endorsed by, or fully compliant with any standards body, and you remain responsible for confirming that the version and interpretation of the standard applied is appropriate for your jurisdiction and project.

7.5 No advice

The Service does not provide professional engineering advice, legal advice, regulatory advice, or any form of certification. Any educational content, tooltips, or in-app guidance is provided for general information only and is not a substitute for advice from a Qualified Professional retained by you.

8. High-risk activities

You acknowledge and agree that the Service is not designed, intended, or authorised for use in connection with any of the following ("High-Risk Activities"):

If you choose to use the Service in connection with any High-Risk Activity, you do so entirely at your own risk and you accept that nothing in these Terms shall be construed as a representation, warranty, or commitment by us that the Service is suitable for such use. You agree to defend, indemnify, and hold us harmless against any claim arising from your use of the Service for any High-Risk Activity.

9. Intellectual property

9.1 Our IP

We and our licensors retain all right, title, and interest in and to the Service, including all calculation engines, algorithms, source code, user interface designs, branding, documentation, and any improvements, enhancements, modifications, or derivative works thereof. No rights are granted to you except those expressly set out in these Terms.

9.2 Feedback

If you provide us with any feedback, suggestions, ideas, or improvements regarding the Service, you grant us an irrevocable, royalty-free, worldwide, perpetual licence to use, modify, and incorporate that feedback into the Service without obligation of any kind.

9.3 IP indemnification by us (limited)

We will defend you, at our expense, from and against any third-party claim alleging that the Service, when used by you strictly in accordance with these Terms, infringes a UK or US patent, copyright, or trade secret. We will pay any damages finally awarded against you in such claim. This obligation does not apply to claims arising from: (a) Customer Data; (b) modifications to the Service made by anyone other than us; (c) use of the Service in combination with any product, process, or material not supplied by us where the claim relates to such combination; (d) your continued use of the Service after we have notified you of an alternative; or (e) your breach of these Terms. If we receive an infringement claim, we may, at our option and expense, modify the Service to be non-infringing, procure a licence for your continued use, or terminate the affected portion of the Service and refund any pre-paid unused fees.

10. Confidentiality

Each party may receive confidential information from the other ("Confidential Information"). Our Confidential Information includes non-public details of the Service's features, performance, calculation methodologies, source code, and roadmap. Your Confidential Information includes non-public Customer Data and any business information you mark as confidential.

Each party agrees to: (i) protect the other's Confidential Information using at least the degree of care it uses for its own confidential information of similar nature (and in any event no less than reasonable care); and (ii) not use or disclose the other's Confidential Information except as needed to perform under these Terms. These obligations continue for five years after the disclosure of the relevant information, and do not apply to information that is or becomes publicly available without breach, was already known prior to disclosure, was independently developed, or is required to be disclosed by law.

11. Service availability and support

11.1 Best-efforts availability

We will use commercially reasonable efforts to keep the Service available, but we do not guarantee uninterrupted availability. The Service may be unavailable from time to time for scheduled maintenance, unscheduled emergency fixes, or events beyond our reasonable control (including outages of third-party hosting providers, internet service providers, or cloud platforms).

11.2 No formal SLA

Unless we have separately agreed a written service-level agreement with you (typically only for enterprise contracts), we do not provide a formal uptime guarantee or service credits.

11.3 Support

Standard support is available by email to support@mepcalc.com during UK business hours, excluding public holidays. We will use commercially reasonable efforts to respond to support requests within one business day, though response times are not guaranteed. Premium support, if available, is described on the pricing page.

12. Suspension and termination

12.1 Termination by you

You may terminate these Terms at any time by cancelling all your subscriptions in accordance with section 5.5.

12.2 Termination by us

We may suspend or terminate your access to the Service, in whole or in part, immediately and without prior notice if:

12.3 Effect of termination

Upon termination, your licence to use the Service ends and you must stop using the Service. We will make your Customer Data available for export in a structured, machine-readable format for 60 days after termination, after which we may delete it. Sections that by their nature should survive termination (including 6.4, 7, 8, 9, 13, 14, 15, 19, and 22) shall survive.

13. Warranty disclaimer

Except as expressly set out in these Terms, the Service is provided "as is" and "as available".

To the fullest extent permitted by law, we disclaim all warranties, conditions, and representations, express or implied, statutory or otherwise, including without limitation:

You assume the entire risk as to the performance of the Service and the use of any Calculation Output. No advice or information, oral or written, obtained from us or through the Service shall create any warranty not expressly stated in these Terms.

14. Limitation of liability

14.1 Mandatory carve-outs

Nothing in these Terms limits or excludes our liability for: (a) death or personal injury caused by our negligence; (b) fraud or fraudulent misrepresentation; or (c) any other liability that cannot be limited or excluded by law.

14.2 Excluded losses

Subject to section 14.1, in no event shall we be liable for any of the following, whether arising in contract, tort (including negligence), breach of statutory duty, or otherwise:

14.3 Aggregate cap

Subject to section 14.1, our total aggregate liability to you, however arising, shall not exceed the total fees paid by you to us under these Terms in the 12 months immediately preceding the event giving rise to the liability.

Where you have paid no fees (for example, on a free tier or during a free trial), our total aggregate liability shall not exceed £100.

14.4 Reasonableness

You acknowledge that the limitations and exclusions in this section reflect a fair allocation of risk between the parties having regard to the Subscription Fees, that we would not be able to provide the Service at the prices charged without such limitations, and that you are responsible for taking out your own professional indemnity insurance to cover any risk arising from your use of Calculation Outputs in your professional work.

15. Indemnification by you

You will defend, indemnify, and hold harmless MEPCalc, our officers, directors, employees, and agents from and against any and all third-party claims, demands, losses, damages, liabilities, costs, and expenses (including reasonable legal fees) arising out of or in connection with:

16. Force majeure

Neither party shall be liable for any failure or delay in performing its obligations (other than payment obligations) to the extent caused by an event beyond its reasonable control, including without limitation acts of God, war, terrorism, civil unrest, pandemics, government action, internet outages, denial-of-service attacks, failures of third-party hosting or telecommunications providers, industrial action, or similar.

17. Changes to the Service or these Terms

17.1 Service changes

We may modify, update, add, or remove features of the Service at our discretion. We will not materially reduce the core functionality of any paid plan during the then-current billing period without your consent.

17.2 Changes to these Terms

We may update these Terms from time to time. When we make material changes, we will: (i) bump the version number above; (ii) update the "last updated" date; and (iii) notify you by email or in-app notice at least 30 days before the changes take effect (except where the changes are required by law or to address security risks, in which case they take immediate effect).

Continued use of the Service after the effective date of any change constitutes acceptance of the updated Terms. If you do not accept the changes, you may cancel your subscription under section 5.5 before the changes take effect.

18. Notices

We will give you notices by email to your Account email address or through in-product notification. You will give us notices in writing by email to legal@mepcalc.com. Notices are deemed received: (a) when sent, if delivered by email and no bounce notification is received within 24 hours; or (b) on actual receipt, if delivered by post.

19. Governing law and disputes

19.1 Governing law

These Terms, and any dispute or claim arising out of or in connection with them or their subject matter or formation (including non-contractual disputes or claims), are governed by and construed in accordance with the laws of England and Wales.

19.2 Jurisdiction

The parties irrevocably agree that the courts of England and Wales have exclusive jurisdiction to settle any dispute or claim arising out of or in connection with these Terms or their subject matter or formation. Notwithstanding the foregoing, we may bring proceedings to enforce our intellectual property rights in any court of competent jurisdiction.

19.3 Informal resolution first

Before initiating formal proceedings, the parties will use reasonable efforts to resolve any dispute through good-faith discussion, escalating to senior representatives if necessary, for a period of 30 days following written notice of the dispute.

20. General

20.1 Entire agreement

These Terms, together with the Privacy Policy, the Sub-Processor Register, and any order form signed between us, constitute the entire agreement between you and us regarding the Service and supersede any prior or contemporaneous agreements, communications, or proposals on the subject.

20.2 Severability

If any provision of these Terms is held to be invalid, illegal, or unenforceable, that provision shall be modified to the minimum extent necessary to make it enforceable, or, if modification is not possible, severed; the remaining provisions shall remain in full force and effect.

20.3 No waiver

A failure or delay by either party in exercising any right under these Terms is not a waiver of that right.

20.4 No assignment

You may not assign, transfer, or sublicense these Terms without our prior written consent. We may assign these Terms without your consent to a successor in connection with a merger, acquisition, restructuring, or sale of substantially all of our assets.

20.5 No partnership or agency

Nothing in these Terms creates any partnership, joint venture, employment, or agency relationship between the parties. Neither party has authority to bind the other.

20.6 Third-party rights

Except as expressly stated, no person other than the parties has any right under the Contracts (Rights of Third Parties) Act 1999 to enforce these Terms.

20.7 Headings

Section headings are for convenience only and do not affect interpretation.

21. Contact

For questions about these Terms, contact us at legal@mepcalc.com.

For privacy and data-protection enquiries, see our Privacy Policy and email privacy@mepcalc.com.

For technical and product support, email support@mepcalc.com.

22. Change log