Software development
Digitization in the middle class: How to measure your success
Digitization is no longer a trend for medium-sized enterprises, but a need to remain competitive. But how to measure the success of Digitalisie...
System Integration Costs: ERP, CRM, APIs and Middleware
What system integration projects cost: ERP, CRM, APIs and middleware. Transparent ranges.
In brief
One investment frame for the data flow
The system integration investment frame covers the whole scope. An API link, ERP or CRM, and an enterprise landscape differ by data flow, not by three prices.
Interactive system integration cost calculator
System integration calculator
What does your system integration cost?
Calculate cost and savings potential of your integration
Step 1 of 425%
How many systems need to be connected?
How the system integration cost range is built
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.
Included
- Inputs shown in the calculator
- Calculator-specific base values and factors
- Displayed one-off and recurring result components
Not included
- Requirements not selected in the calculator
- Unknown data migration and third-party licence costs
- Taxes, legal advice and a binding delivery commitment
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.
Technical responsibility and review
- Technical owner
- Björn Groenewold
- Role
- Managing Director and software engineer
- Expertise
- Software development and software estimation
- First published
- Last technical review
- Price basis
- September 2026
Sample calculations & scenarios
Concrete project profiles with assumptions and indicative budgets—useful for internal alignment alongside the calculator.
System integration: typical costs
Integrating two or more systems (e.g. ERP, CRM, e-commerce, shipping) depends on the number of systems, data volume, transformation logic and whether standard APIs exist. The investment frame is EUR 2,975 – 77,000 excl. VAT. Point-to-point links and multi-system landscapes sit inside that frame. A workshop turns it into a scoped offer.
What drives system integration costs?
The main cost drivers are the number of systems and interfaces, the complexity of data mapping and transformation, and whether you need real-time sync or batch processing. Standard APIs (e.g. REST, SOAP) reduce effort; legacy or proprietary systems often require custom adapters. Middleware (e.g. message queues, ETL tools) adds capability but also cost and should be chosen to match your scale and reliability requirements. We recommend a short discovery workshop to map your systems, data flows and goals – then we provide a fixed or capped quote so you can plan with confidence.
Ongoing costs include monitoring, error handling and changes when source or target systems are updated. We design integrations to be maintainable and document data flows and dependencies so your team or our support can operate them long term. Use the calculator below to estimate integration effort; for a tailored quote for your ERP, CRM or e-commerce integration get in touch – we outline scope and typical cost ranges without obligation.
Request a quoteFAQ
System Integration Costs
Costs & Quote
How much does system integration cost?
The investment frame is EUR 2,975 – 77,000 excl.
VAT. A single connection and a broader landscape differ in scope, not in two price lists. The exact figure follows from a scoping workshop.
What drives system integration costs?
Main factors: number of systems and interfaces, complexity of data mapping and transformation, and whether you need real-time sync or batch processing.
Standard APIs reduce effort; legacy systems often require custom adapters.
What about ongoing costs?
After go-live you budget for monitoring, error handling and adjustments whenever a connected system changes.
Because we build for maintainability and document every data flow, your team or our support can keep the integration running for years.
How do we get a fixed quote?
Start with a compact discovery session that maps systems, data flows and objectives.
On that basis we issue a fixed or capped price, so budgeting carries no surprises.
System integration: cost per data flow
How costs arise for your system integration
Map the landscape, pick integration patterns, and care—so data flows stay predictable.
1. Map the system landscape
We map systems and data flows. From that follows how many interfaces are really needed—often fewer than first thought.
2. Integration patterns per flow
We pick API, webhook, ETL, or event bus and calculate per variant. That avoids a lump sum that later goes over.
3. Build, tests, and resilience
We estimate build, contract tests, and resilience (retries, idempotency). That's where cheap solutions later cause high follow-up costs.
4. Monitoring and care
We calculate monitoring, alerting, and care. Integrations without monitoring go silent in 12 months—with expensive consequences.
Typical pricing models (overview)
| 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.
What determines the costs, and what comes next?
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 system integration ROI? Contact us.
The calculator result for system integration ROI is indicative only – a binding budget follows scope alignment, data review, and quality targets.
Plan follow-on costs
- Operations and maintenance separate from the initial build
- Internal key users and training
- Monitoring and support after go-live
Next steps after the calculator
- Intro call: funding and phased delivery
- Discovery, pilot, or rollout matched to risk
- Documented assumptions and exclusions in the quote
Compare related calculators in the costs hub for edge cases (integrations, compliance, parallel run).