HOTEL NIGHTS
How many days is 3 nights? What “3 days 2 nights” means
Hotel “3 nights” and a tour’s “3 days 2 nights” are not the same unit. Split nights from calendar days before you match a leave form or the morning you fly home.
FOR PEOPLE BETWEEN PLACES
A big world. Simple tools.
Plan time zones, convert units, check luggage and plugs, count trip and Schengen days, estimate flights, data and card fees, and shift sleep for jet lag—all without an account.
Your inputs stay in this browser.
Timezone meeting plannerCalculated in your browser
GUIDES
Read a guide before the calculator
Each article solves one problem, with examples, a review date and sources. You can read it without using the tool. All guides →
CHECKED LUGGAGE
Checked luggage: what the size and weight limits actually mean
Checked baggage allowances are set per route, cabin and fare. First see whether this ticket uses weight, pieces, or a low-cost paid add-on, then measure and weigh the packed bag.
PAYING ABROAD
Paying abroad: cards, cash and the conversion fee trap
Spending abroad usually has two costs: your issuer’s foreign transaction fee, and the spread charged by a terminal or exchange desk. Separate them before you choose which card to pack and how much cash to carry.
KOREA CONNECTIVITY
Korea: travel eSIM, Wi-Fi egg or a local prepaid?
Seoul and Busan trips need data for maps, translation and ride-hailing. Decide from stay length, how many devices you carry and whether you need a Korean number — then install an eSIM at home or take a passport to an Incheon or Gimpo roaming counter.
EUROPE eSIM
Europe: is one regional eSIM enough for several countries?
Paris to Rome to Barcelona is a network-switch problem, not a reason to buy three SIMs. First ask whether you already have EU roam-like-at-home on a home plan, then check whether the regional eSIM list includes the UK and Switzerland.
US CONNECTIVITY
Visiting the US: travel eSIM, prepaid or home roaming?
New York, Los Angeles or a national-park loop all need data for maps and ride-hailing. This page is for inbound visitors and short stays. It does not assume which country you flew from. Start from trip length, whether you need a US number, and whether you can install a profile before take-off.
POCKET TOOLS
Focused tools for your next trip
Choose a task and get the answer without searching through a long article.
TIME
Timezone meeting planner
Compare local times across common global cities.
Shanghai--:--London--:--
DATEHOT
Trip days and hotel nights counter
Count hotel nights and inclusive calendar days.
—Hotel nights—Calendar days
UNIT
Unit converter
Convert length, weight and temperature.
6.2137Miles mi
BAG
Luggage size and weight
Convert dimensions and calculate linear size and volume.
115Linear size · cm44.0Approx. volume · L
DATA
Travel data estimator
Estimate how many gigabytes your trip may need.
≈ 10Suggested allowance · GB
FLYHOT
Flight time and arrival calculator
Estimate flight time and local arrival time between common cities.
11 h 19 minEstimated duration≈ 9,197 kmDistance
FEE
DCC and foreign transaction fee calculator
Compare paying in local currency with a DCC markup.
515Extra with DCC10815Pay with DCC
PLUG
Travel plug and voltage checker
See plug types, voltage and whether you need an adapter.
GPlug types230V50Hz
STAY
Schengen 90/180 stay calculator
Count days used in the rolling 180-day window.
—Days used—Days left · 90
DESTINATION
Destination not decided?
Start with general tools for time, luggage and data, then choose a destination for tailored recommendations.
Browse all tools →