Use the Commission tool as the reference check
Roam Window is an independent planning aid. The European Commission publishes the official short-stay calculator and explains its check and planning modes. The Commission also states that its calculator is only a helping tool and does not create a right to stay. Use it as the primary arithmetic cross-check, then consult an authority for legal or status questions.
A comparison is useful only when both tools receive the same scenario. Copy exact entry and exit dates, keep inclusive boundaries, and select equivalent modes. Do not compare a result based on completed stays with another result that already includes a proposed trip.
Match check mode and planning mode
Commission check mode examines previous or ongoing stays as of a chosen check date. Planning mode asks how much stay may be available from a future entry date based on previous stays. Those questions are related but not identical. Record which question you are asking before comparing numbers.
In Roam Window, keep completed trips in the ledger and use the separate future-trip check for a proposal. In the Commission tool, enter the same previous stays and choose the corresponding mode. Confirm that day, month, and year have not been reversed during transcription.
Diagnose a disagreement
Start with the simplest shared case: no previous stays should leave the full ordinary allowance, and a same-day stay should use one day. Then add completed ranges one at a time. Find the first range or tested day that changes the tools differently. This is faster and safer than comparing only the final badge.
Typical causes include an exclusive exit date, overlapping ranges, a missing absence, an internal Schengen transfer entered as an exit, or a long-stay/residence period that the Commission says not to enter. A stale browser tab or an uncommitted form edit can also create different inputs. Save or reload before the final comparison.
What to do after the numbers match
Matching results increase confidence that the date arithmetic was entered consistently; they do not decide admissibility. Check the visa sticker, passport, travel purpose, supporting documents, and current official country guidance. Near the ceiling, leave practical room for a correction or disruption where possible.
If the same verified inputs still produce different results, send Roam Window the exact non-sensitive date ranges, chosen mode, check or proposed entry date, and both outputs. Do not send passport scans or visa identifiers. For an immediate travel decision, rely on the competent consulate or border authority rather than waiting for a software correction.
- Use identical completed ranges.
- Use equivalent check or planning modes.
- Locate the first divergent day.
- Escalate legal-status questions outside the calculators.
Official sources
Sources were checked on . Linked institutions may update their guidance after that date.