How long could your Spring Boot 4 migration actually take?

Find out how long your Spring Boot 3.5 → 4 migration could actually take, based on your codebase, your team, and the upgrades you can't skip.

This calculator can only provide an estimate. The results do not guarantee a delivery timeline, a fixed migration plan, or act as a replacement for hands-on technical analysis.

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Migration Estimate Report

This is only an estimate. The results do not guarantee a delivery timeline, a fixed migration plan, or act as a replacement for hands-on technical analysis.

ESTIMATED DURATION

7.4 - 10.6 weeks

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8 weeks after the June 30, 2026 deadline

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Your inputs

Applications

1

Application size

Large

Developers

1

Automated tooling

No

Spring projects

Boot, Framework

JDK path

17

-

25

Upgrades

servers, JUnit, Jackson

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