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Fiverr Pro
English
$
USD
I will build an interactive ROI calculator or financial tool for your website
Leomhar
About this gig
Need an interactive ROI calculator or financial tool for your website? Ill build a responsive, user-friendly calculator using JavaScript, React, and Tailwind CSS.
Your calculator can include custom inputs, formulas, dynamic results, and polished UI designed to match your brand or website.
What I offer:
ROI and savings calculators
Cost and revenue calculators
Pricing and financial tools
Custom formulas and user inputs
Dynamic results and interactive UI
Responsive desktop and mobile layouts
Clean, organized frontend code
Calculations run entirely in the browser using client-side JavaScript. Results are based on the formulas and assumptions provided for the project.
Please note: This service does not include a backend, external database, real-time data integration, payment processing, or financial advice. User inputs and calculation results are not stored in an external database.
Send your calculator requirements, formulas, and design references, and Ill turn them into a working interactive frontend tool.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Leomhar
Leomhar
Frontend Developer
- FromPhilippines
- Member sinceMay 2026
Languages
English
I build responsive frontend websites, SaaS dashboard prototypes, interactive business tools, and custom UI components using React, JavaScript, TypeScript, and Tailwind CSS.
My services include B2B websites, ROI calculators, product launch pages, frontend bug fixes, and responsive UI improvements.
I focus on clean layouts, reusable components, and interactive client-side functionality. Backend systems, databases, authentication, payment processing, and complex server-side integrations are not included.
My Portfolio
FAQ
What types of calculators can you build?
ROI, savings, pricing, investment, cost, revenue, and other custom business calculators.
Do I need to provide the formulas?
Yes. Please provide your formulas, rules, or calculation examples so I can implement them accurately.
Does the calculator need a backend?
No. It runs entirely in the browser using client-side JavaScript, with no database required.
Can it match my website's design?
Yes. Send your website, logo, brand colors, or design references for a matching interface.
Can I embed it on my existing website?
Yes. The calculator can be built as an embeddable frontend tool for your website.
Is user data stored?
No. By default, calculations run locally in the browser without external data storage.
