Estimate the budget for replacing your VB6 application – by size, target platform and state of the code base, including legacy data migration and parallel operation.
In brief
The investment frame for replacing VB6 is EUR 10,710 – 130,084 excl. VAT. Desktop, web and hybrid change the target, not a second project price.
The upfront cost can be spread over 72 months. Terms are on the software financing page.
The calculation follows six visible stages. All figures remain planning values until scope and assumptions have been reviewed.
1. Capture inputs
The calculator records the visible project, volume, complexity and operating parameters selected on this page.
2. Add fixed components
Fixed base modules and selected add-ons are added without mixing them with recurring charges.
3. Apply multipliers
Quantity, complexity and scope factors multiply only the cost components identified for them in the calculator model.
4. Create the range
The calculator applies its documented lower and upper uncertainty factors to the base result; ROI views keep investment and savings visible separately.
5. Round and calibrate
Monetary result fields are rounded to the nearest whole euro. Public project-cost components are calibrated with the centrally maintained display factor.
6. Classify the result
The result is shown as non-binding guidance. A binding quote requires scope, data, integrations, risks and acceptance criteria to be reviewed.
Efficiency or discount factor: A central display factor of 0.7 is applied to public project-cost components to keep all calculators aligned with the currently reviewed pricing basis. It is not a customer-specific discount; customer-entered wages, revenues and existing operating costs are not reduced.
Why this is not a binding quote: The calculator cannot verify complete requirements, third-party dependencies, data quality, legal constraints or acceptance criteria.
Concrete project profiles with assumptions and indicative budgets—useful for internal alignment alongside the calculator.
FAQ
According to the VB6 replacement cost calculator, the non-binding project range is EUR 10,710 – 130,084 excl.
VAT. Small tools with few forms sit at the lower end. Many screens, reports, interfaces, missing documentation and broader target platforms increase the effort for grown business applications.
The calculator narrows the range by size, target platform and the state of the code base.
Automatic converters often produce hard-to-maintain code that preserves the old structures.
In most projects, a structured redevelopment that carries over the business logic is more economical: the code becomes modern, testable and cleaned of legacy baggage – with a predictable budget.
If only the source code exists and the original developers' knowledge is gone, the business logic has to be reconstructed through code analysis and interviews.
That adds roughly 45% – the calculator prices the upfront code audit at EUR 3,150 excl. VAT.
Discuss your VB6 replacement
We analyse your VB6 application, assess risks and recommend the most economical migration path.
A modern desktop application (.NET) is the most direct path and often the most economical option for workstation software.
A web application (+25%) makes the solution location-independent; the hybrid approach with desktop client and web backend (+50%) combines offline capability with centralised data.
The VB6 IDE has not been developed since 2008; the runtime only ships for compatibility reasons.
Every Windows update can cause problems, developers with VB6 knowledge are getting rare, and interfaces to modern software (REST APIs, cloud) are barely feasible. The longer the replacement waits, the more expensive it gets.
With parallel operation (EUR 3,150 excl.
VAT via the calculator), old and new systems run side by side for a transition period – with data reconciliation and defined cut-over dates per module.
That minimises risk: production never stops, and every function is validated in real operation before the VB6 application is switched off.
| Model | When it fits | Budget & flexibility | Typical risks |
|---|---|---|---|
| Fixed price (fixed scope) | Clearly defined scope, stable requirements, repeatable delivery. | Predictable total cost; little room for change without a change order. | Scope creep leads to change orders or quality trade-offs. |
| Time & Material | Discovery, legacy, evolving requirements, or close collaboration. | Maximum flexibility; budget transparent via hourly or daily rates. | Without prioritisation, effort can grow—backlog and reviews matter. |
| Retainer / maintenance package | Ongoing operations, updates, small features, and support. | Agreed capacity per month; predictable follow-on cost. | Large changes may still need a separate estimate. |
| Hybrid (milestone + T&M) | MVP or phased releases with clear go-lives, then iterate. | Core delivery fixed price; extensions on a time-and-materials basis. | Define contractually what is in scope vs. extra work. |
Calculators on this page provide indicative ranges; we choose the right model with you based on risk, scope, and planning horizon.
The ranges shown are indicative. For a binding quote we discuss scope, priorities and funding options in a free intro call. Many digitalization projects qualify for grants – try our funding calculator.
Browse all cost calculators, explore services and typical solutions. Questions about VB6 replacement? Contact us.
After using the VB6 replacement calculator, validate assumptions in a short intro call.
Browse all cost calculators in the costs overview.
What does migrating your VB6 application cost?
Interactive estimate based on your inputs.
Non-binding project range from the software cost calculator: EUR 10,332 – 372,623 excl. VAT.
Methodology: The estimates are based on historical project data, complexity drivers and standard implementation assumptions. Results are a non-binding indication only; effort and price must be calculated individually.
If you are still deciding
If you are ready to implement
Calculator overall range
EUR 14,000–210,000 excl. VAT, depending on codebase and migration risk
The overall range is derived from the valid parameters of the relevant cost calculator.
Typical duration
2–15 months
Main risk drivers
Non-binding indication
This result is only a non-binding indication based on typical assumptions. Effort and price must be calculated individually for your project.
A transparent four-step process for validating the VB6 Replacement indication with concrete requirements.
1. Confirm scope and target outcome
We clarify the business outcome, user groups, and boundaries relevant to VB6 Replacement.
2. Review data, interfaces, and risks
We validate integrations, data quality, security, compliance, and operational dependencies.
3. Check the calculator assumptions
We compare the selected parameters with the real system landscape and document deviations.
4. Prepare the precise quote
You receive a scoped proposal with milestones, exclusions, price model, and next decision point.
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