Excel → Web Application
Converting a business spreadsheet into a custom web application typically runs from about $8,000 for a single-process replacement to $200,000+ for an integrated operational platform. The price is driven by how many users, integrations and business rules the spreadsheet carries — not by how many rows it has.
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If you are weighing the cost, the decision comes first: Datanova helps businesses replace an Excel process with a custom web application.
Most Excel-to-web-app projects fall into one of three bands. The band is set by how much of the business the spreadsheet is actually running — a 400,000-row file that one analyst opens once a week is a smaller project than a 2,000-row file that eleven people edit daily and that feeds invoicing.
$8,000 – $25,000
4 – 8 weeks
One spreadsheet, one workflow, a handful of users. Structured data entry, validation, roles, history and a reporting view — replacing the file itself rather than the systems around it.
$25,000 – $75,000
2 – 4 months
The spreadsheet is the system of record for a department. Multiple roles, approval steps, audit trail, notifications, and integration with one or two existing systems.
$75,000 – $200,000+
4 – 9 months
Several spreadsheets and manual handoffs replaced at once, with a data warehouse behind them and dashboards on top. This is a platform, not a form.
Indicative ranges for the US market, based on typical scope rather than a quote. Your number depends on integrations, compliance requirements and how well the current process is documented. A consultation produces a fixed-scope figure.
Teams usually expect file size to matter. It rarely does. These are the factors that move a quote by tens of thousands of dollars:
| Driver | Cheap when… | Expensive when… |
|---|---|---|
| Business rules | The logic is explicit and someone can write it down | The rules live in nested formulas, VBA and one person's judgment |
| Integrations | Data arrives by upload or a single API | Two-way sync with an ERP that has no modern API |
| Users and roles | Everyone sees and does the same things | Permissions vary by role, region, customer and record |
| Data quality | The spreadsheet is consistent and typed | Merged cells, mixed formats and years of exceptions |
| Compliance | Internal use, no external audit | Traceability, retention and audit-trail obligations |
| Decision-making | One owner who can answer questions same-day | Committee sign-off on every screen |
The single largest cost variable is usually undocumented business rules. Time spent reconstructing what a spreadsheet does is time not spent building.
A useful way to read any proposal is by where the hours go. On a typical project in the middle band, the rough split looks like this:
| Phase | Share of budget | What happens |
|---|---|---|
| Discovery and process mapping | 10 – 20% | Reconstructing the real workflow, including the exceptions |
| Data model and migration | 15 – 25% | Turning sheet columns into a schema; cleaning and importing history |
| Application build | 35 – 45% | Forms, workflows, roles, validation, reporting views |
| Integrations | 0 – 25% | Connecting to ERP, CRM, accounting or email |
| Testing, training and rollout | 10 – 15% | Parallel running, fixing what discovery missed, getting people to switch |
Be suspicious of a proposal with no discovery line and no rollout line. Both are where Excel replacements fail — the first because the app ends up solving the wrong problem, the second because people quietly keep using the spreadsheet.
The build is not the whole number. Budget for these from the start:
Not every spreadsheet should become software, and a consultant who never says so is selling, not advising. Converting is usually the wrong call when:
In several of these, optimizing the spreadsheet or automating the workflow around it delivers most of the benefit for a fraction of the cost.
Ranges are useful for budgeting and useless for deciding. To turn a range into a figure, a consultant needs to see the file, understand who touches it and what happens downstream, and know which systems it has to talk to. That usually takes one conversation.
In a free consultation we look at how your team uses Excel today and tell you whether optimizing it, automating the workflow, or replacing it is the right move — and what that costs.