What does the TM30 calculator calculate?

It calculates the TM30 legal due date from the accommodation start date and, when that date falls on a weekend or included Thai public holiday, moves the practical office deadline forward to the next working day.

How is the TM47 90-day reporting date calculated?

THaiculator counts 90 days from the Thailand entry date for a first report or from the previous TM47 report date for a later cycle. It also shows the filing window and an office-action date adjusted to a previous working day when necessary.

Does THaiculator send my dates to a server?

No. The calculator runs in the browser. Calculation dates are not sent to a THaiculator backend because there is no calculator backend.

Thailand immigration utility · no account required

Your Thailand deadline.
Without the guesswork.

Calculate TM30 and TM47 dates locally in your browser. THaiculator follows the same core date logic as THaiva, including weekend handling and the bundled 2026 Thai public-holiday calendar.

Runs in your browser Bangkok date semantics Holiday-aware

01 · Choose what you need

02 · Prepare without tab chaos

Your TM47 checklist

Select a calculation type to load the matching preparation list.

0 / 0 Checked on this device only

03 · Transparent logic

What THaiculator actually does

No black box. The rules are deliberately small, versionable and inspectable.

Count the legal date

TM30 uses the accommodation start date + 1 day. TM47 uses entry or the previous report + 90 days.

Apply the correct direction

TM30 office handling moves forward to the next working day. TM47 office planning moves back to the previous working day.

Explain every adjustment

Weekends and bundled Thai public holidays are shown in the result instead of silently changing the date.

Holiday packThailand · 2026

Rules timezoneAsia/Bangkok

Calculation modeBrowser only

Backend callsNone

THaiva visual with a Thai temple at night

Full stay management

TH Powered by THaiva

A calculator answers one date.
THaiva keeps the whole stay in context.

Save passports, visas, addresses, entries and exits. Track immigration matters, prepare documents and keep the next action visible instead of recalculating everything from scratch.

Stay timelineTM30 / TM47DocumentsReminders

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Before you rely on a date

A few important details

Why can the legal date and the office date be different?+

Immigration obligations have a legal or domain date, but an office may be closed on a weekend or public holiday. THaiculator keeps the legal date visible and separately shows the working-day date used by the THaiva calculator logic.

Why does TM30 move forward while TM47 can move backward?+

For TM30, the current THaiva rule resolves a non-working legal due date to the next working day. For TM47 office planning, the calculator resolves to the previous working day so an office visit is not recommended after a closed due date.

What happens if I calculate a year without a holiday file?+

The date arithmetic and weekend logic still work, but THaiculator will clearly flag that public-holiday coverage is incomplete. Add the matching year file under data/holidays/ and redeploy to restore full holiday-aware results.

Is this legal advice or an official Thai government service?+

No. THaiculator is a planning utility powered by THaiva. It does not replace official Thai immigration guidance, local office instructions or professional legal advice. Always verify a material deadline when your circumstances are unusual.