Choose a manageable calculation
One approved non-regulated formula, up to three numeric inputs and one result. Multiple formulas, specialist calculations and complex quotation engines need a separate scope.
DaveBrain · Bristol, UK
A simple question.
A useful
calculation.
One approved formula. A clearer answer.
Add a small calculator to one supported existing website, such as a simple area or quantity estimator. David agrees the formula, units and expected answers with you before building it.
Personal help from David. Scope and suitability agreed before booking.
Clear scopeAgreed priceYou keep controlPersonal handover
What the offer covers
Practical help.
Clear boundaries.
Agree what the answer means
Confirm units, rounding, input limits and expected answers. The business approves the formula and wording, including whether the result is an estimate.
A small supported add-on
Add the agreed calculator to one compatible existing website, with a clear result and a route to your existing enquiry page. Hosting and platform subscriptions remain separate.
Check the edge cases
Check agreed examples, zero, empty, negative, large and invalid values, with useful error messages. Include mobile and keyboard checks before publication.
No live AI answers
The agreed calculation uses fixed approved rules. This starter does not collect sensitive data, take payments, make bookings or generate live AI responses.
A clear finish
One round of changes within the brief and a practical handover. Later formula changes, pricing integrations and new features are separate; overlapping work in an existing website brief is removed from the quote.
Know what you’re choosing
One useful result.
No extra subscription.
£195 for one supported website, one approved non-regulated formula, up to three numeric inputs and one result. Includes validation, mobile checks and one revision. Hosting and integrations are separate.
- £195 one-off
- Scope and suitability agreed first
- Customer-controlled accounts and information
- Practical checks and a handover
- No automatic monthly support charge
Tell David what you need first. We confirm availability, suitability, scope and any separate costs in writing before you commit.
How to get started
A conversation.
Then a clear plan.
Tell David what you need
Choose this service on the enquiry form and describe the outcome you want. No payment or files are needed to start.
Agree the scope
We check suitability and availability, then confirm the brief, full price, timing, access and any separate costs.
Work and handover
The agreed work is completed and checked with you, with a practical handover and any next steps made clear.
Before we begin
Clear about the details.
Can it calculate loan payments, medical results or safety limits?
Financial, legal, medical and safety-critical calculations are excluded. The starter is for one simple, supplied and approved non-regulated formula.
Can it produce automatic quotations or take payment?
Pricing engines, live quotations, payments, bookings and integrations are outside this starter scope. A simple quantity result can link to your existing enquiry route.
Is there a monthly calculator fee?
No extra monthly subscription is required for this static feature. Your existing website hosting or platform fees continue. Later content or formula changes can be quoted separately.
What if calculator work is already included in my website project?
We review the existing brief and quote only for distinct additional work, avoiding a duplicate charge.
Let’s talk
What do you
have in mind?
Tell David about your website calculation. The homepage form will have this service selected for you.
This is an enquiry, not a booking or purchase. No marketing signup. Please do not send passwords, identity documents or sensitive files through the public form.