What Is an ETA Calculator?

ETA stands for estimated time of arrival. It is the clock time at which you expect to reach your destination, whether you are driving, cycling, catching a train or sitting on a plane. An ETA calculator works it out from three simple facts: when you set off, how far you are going and how fast you expect to travel.

You probably arrived here with a specific question in mind. Maybe you typed estimated time of arrival calculator while sorting out an airport pickup, or you wanted a what time will I arrive calculator for a long train ride. Some people need a road trip time calculator that allows for lunch stops, and others only want to know when to leave. This one tool handles all of that. Besides the arrival time, it works backwards as a departure time calculator and tells you the speed needed to arrive on time.

You will also see the term ETD, which means estimated time of departure. If ETA answers the question "when do I get there?", ETD answers "when do I have to leave?". This calculator covers both, so you never need to switch between tools or do the sums on the back of a receipt.

How to Calculate Estimated Time of Arrival

Every ETA, from a school run to an ocean crossing, comes from one formula: time equals distance divided by speed. To calculate ETA from distance and speed, you divide the distance by your average speed and add the result to your departure time. If you have ever wondered how to calculate estimated time of arrival without a tool, this is the whole method.

1. Divide the distance by your average speed. The answer is the travel time in hours, usually with a decimal part.
2. Turn the decimal into minutes by multiplying it by 60. A quarter of an hour, 0.25, is 15 minutes.
3. Add any stops. Fuel, food and rest breaks all count towards the total.
4. Add the total to your departure time. If you pass midnight, the arrival falls on the next day.

Keep the units matched. Miles go with miles per hour and kilometres go with kilometres per hour. Mixing them up is the most common way to get a wrong answer by hand. The calculator converts for you, so you can enter miles and km/h together if that is what you have.

A few quick examples show how the numbers behave:

That is easy enough for a single trip. It gets fiddly once you add kilometres, a break in the middle and a different time zone at the other end, and that is where the calculator saves you both time and mistakes.

How to Use This ETA Calculator

The calculator at the top of this page has three modes, a handful of optional settings and a result screen that shows its working. Here is every control explained in the order you will meet them.

Step 1: Choose what to work out

Three tabs sit at the top of the form. Pick the one that matches your question, and the fields below change so you are only asked for what that mode needs.

Step 2: Enter the journey

Distance and speed. If you know how far you are going, type it into the Distance box and choose mi or km. Then enter your average speed and pick mph or km/h. If you change a unit after typing, the number is converted for you, so 100 km becomes 62.14 mi instead of staying at 100. The first time you open the calculator it picks miles or kilometres to suit your device language, and you can switch with one tap.

Under the speed box are five travel buttons: Walk, Cycle, Drive, Train and Fly. Each one fills in a typical speed to get you started (the table further down lists them). Tap one, then overwrite the number with your own if you know your pace better.

Journey time. If a timetable, sat nav or airline has already told you how long the trip takes, switch to the Journey time tab and enter hours and minutes instead. The +15m, +30m, +1h and +2h buttons add to whatever is already there, and Clear sets it back to zero. This is the best route for flights and trains, because a scheduled duration is more reliable than any speed you could guess.

In Speed needed mode the speed box disappears, because speed is the thing being solved. You only enter the distance and choose which unit you want the answer in.

Step 3: Set the date and time

Use the date and time pickers in the green panel. In Arrival mode this is when you leave. In Departure mode the label changes to Arrive by, because now you are telling the calculator when you have to be there. Speed needed mode gives you both: a departure row and an arrive by row, with a +1h button that nudges the deadline an hour later.

Tap Now to fill in the current date and time for the time zone you have chosen. It is the quickest way to answer what time will I get there if I leave now, because you only need to add the distance and speed.

Step 4: Add breaks and traffic

Breaks. Type the total minutes you expect to spend stopped, for example 30 for a fuel stop and a sandwich. In Departure mode this box is labelled Breaks / buffer, because it is also the right place for a safety cushion such as 15 minutes to park and walk in.

Traffic / delays. This menu adds a percentage to your moving time to reflect slow roads. It applies to travel time only, never to your breaks, and it is switched off in Speed needed mode where you are working back from a deadline.

The traffic setting is plain percentage maths. If you would like to test a figure that is not on the menu, such as 35%, our percentage calculator makes it quick: add 35% to the moving time and enter the result as the Journey time.

Step 5: Pick the time zones

Start zone and End zone both begin on Mine, which is the time zone of your own device. If your trip crosses zones, choose different ones from the list. It covers about fifty major zones from Honolulu to Auckland, each shown with its UTC offset. The results are then displayed in local time at each end, so a flight that leaves New York at 7:00 PM shows its arrival in London time, not New York time.

Step 6: Calculate and read the result

Press the yellow button. It reads Calculate arrival, Calculate departure or Calculate speed depending on the tab, and pressing Enter on your keyboard works too. The form slides away and the result appears with a short animation. Here is what you will see:

• The headline. Your arrival time, your Leave by time or the average speed needed, with digits that roll into place. Underneath is the full date and the time zone used. A small badge such as Next day appears when the trip crosses midnight.
• The Depart and Arrive ticket. Both clock times and dates side by side, with the total duration in the middle.
• Four coloured boxes. Travel, Breaks and Total, plus either the distance in the other unit or the time difference between your two zones.
• The working line. A plain sentence showing the sum, such as 200 mi at 80 mph equals 2.5 hours, so you can check the answer yourself.
• The live status bar. It counts down to departure or arrival and fills up as the trip progresses, updating every second while the result is open.

Step 7: Copy, save or share

• Copy puts a short text summary on your clipboard, ready to paste into a message.
• The calendar icon downloads an event with your departure and arrival times and a reminder 15 minutes before you set off. It opens in Google Calendar, Apple Calendar, Outlook and most other calendar apps.
• Share opens the share menu on a phone. On most computers it copies a link that reopens the calculator with your exact trip already filled in and calculated.
• Edit trip takes you back to the form with everything still filled in, and the Reset button puts the defaults back.
• The 12h and 24h switch at the top right changes the clock style at any time. It starts in whichever format your device uses.

Arrival Time Calculator: What Time Will I Get There If I Leave Now?

Arrival mode is the one most people need most of the time. It answers a plain question: what time will I get there if I leave now?

Tap Now so the departure matches the current moment, enter the distance and your average speed, then press Calculate arrival. Suppose a delivery driver leaves the depot at 13:10 with 96 km to cover at an average of 64 km/h. That is 1.5 hours, so the arrival time is 14:40.

If the trip carries you past midnight, the result shows a badge such as Next day so nobody turns up twelve hours early. Leave at 22:30 with a journey of 5 hours 15 minutes and the calculator shows 03:45 with that badge beside it.

Use a realistic average speed rather than the speed limit. An average includes junctions, slow sections and the first few minutes spent getting out of the car park, so it is nearly always lower than the number on the road signs. If you have made the trip before, your own past journey time is the best guide you have. A what time will I arrive calculator is only as good as the speed you give it.

Departure Time Calculator: How to Know What Time to Leave to Arrive on Time

Working backwards is just as useful. Switch to the Departure tab, enter the time you must be there, then add the length of the journey. The result is a Leave by time. If you have ever searched for a what time do I need to leave calculator, this is the mode you were after, and it saves you from trial and error with a map app.

Take a 9:00 AM appointment 45 miles away. Town traffic keeps you to about 30 mph, so the drive takes 1 hour 30 minutes. Put 15 minutes in the Breaks / buffer box for parking and a quiet moment in the car, and the total becomes 1 hour 45 minutes. The calculator tells you to leave by 7:15 AM.

Treat the buffer as a habit rather than a luxury. Arriving ten minutes early costs you nothing, while arriving ten minutes late can cost you the appointment, the train or the flight. Early starts also go better after a proper night's rest, and our sleep calculator can suggest bedtimes that line up with your wake-up time.

Speed Needed to Arrive on Time

Sometimes the departure is already fixed and the deadline cannot move. Speed needed mode flips the question and tells you how fast you must travel on average to arrive on time.

Enter the distance, the departure date and time, the arrive by date and time, and any breaks. Say you have 150 miles to cover, you leave at 9:00 AM, you must arrive by 12:30 PM and you plan a 30 minute break. That leaves 3 hours of actual moving time, so you need to average 50 mph. The calculator shows the same speed in the other unit as well, which here is 80.5 km/h.

The answer is rounded up to the next 0.1, so you are never left a fraction short. It is also the minimum average for the whole trip, including slow stretches, which means your cruising speed on open road would need to be higher. If the figure is above the legal limit for your route, the safe answer is to leave earlier or ask for a later arrival, not to speed. The same mode works well for runners and cyclists who want to know the pace needed to hit a target finish time.

ETA Calculator With Time Zone: Flights and Long-Distance Trips

A trip that crosses time zones is where most hand calculations go wrong. You leave at 7:00 PM, fly for seven hours and the clock at the other end shows 7:00 AM, not 2:00 AM, because the two places are not on the same time. This page works as an ETA calculator with time zone support and as a travel time calculator with time zones, so the arrival is shown in local time at the destination.

To use it as an ETA calculator for flights in different time zones, choose the Journey time method and enter the scheduled flight duration from your booking. Then set the Start zone to the departure airport's zone and the End zone to the arrival airport's zone. The Depart and Arrive times in the result are both local, so you can tell whoever is collecting you exactly when to be at the arrivals hall. The calculator does not look up airports or flight numbers, so take the duration from your booking.

All times are local. The examples use January dates and sample flight times, and real schedules vary by airline.

Clock changes add another wrinkle. Countries switch to summer time on different dates, so for a few weeks each year the gap between New York and London is four hours instead of the usual five. The calculator applies the real rules for the date you pick, so there is nothing to remember. If you type a time that does not exist because the clocks jumped forward, it moves to the next valid time and says so underneath the result.

If your journey crosses several countries in Europe, remember that the Schengen area has its own day-count rule for visitors. Our Schengen calculator helps you keep track of it.

Road Trip Time Calculator: Breaks, Traffic and Planning

Road trips are where a simple distance divided by speed answer is at its most optimistic. Fuel stops, meals, roadworks and the odd wrong turn all add minutes. To use this page as a road trip time calculator, work out the moving time first and then add real life on top.

Use the Breaks box for the total of your planned stops. Road safety advice commonly suggests a break of at least 15 minutes after every two hours of driving, so an eight hour drive usually needs about three breaks, or 45 minutes, before you count any meals. Then choose a traffic level that suits your route and the time of day.

Heavy traffic is fairly easy to predict around public holidays and the start of school breaks. Check the dates with our date calculator and bank holidays tool before you decide between a moderate and a heavy setting.

Once you know how long the drive will take, you can see what it will cost with our fuel cost and MPG calculator. If you drive an electric car, add your charging stops to the Breaks box and estimate the bill with the EV charging cost calculator.

ETA Calculator Miles Per Hour and Kilometres Per Hour

This works as an ETA calculator for miles per hour, and it is just as happy with kilometres per hour. Switch the unit with a single tap and the number you typed is converted using the exact factor of 1.609344 kilometres per mile. You can even enter the distance in miles and the speed in km/h. The calculator converts everything internally before it does any maths.

If you only need to convert a speed without planning a trip, our km/h to mph converter does exactly that. Fuel economy is quoted differently from country to country too, so the litres to gallons converter is handy when you compare figures.

Remember that a speed limit is not your average speed. A road signed at 70 mph rarely gives you a 70 mph average once junctions, queues and slower sections are included.

Average Speeds by Travel Mode

The five travel buttons under the speed box fill in sensible starting points. They are averages for a whole journey, not top speeds.

For flights and trains it is usually better to skip the speed and enter the timetable duration as the Journey time. A scheduled duration already includes taxiing, stops and slower sections, so it beats any average you could work out yourself.

How Speed Changes Your Journey Time

The chart below shows the same 100 mile trip at six different average speeds. The first few extra miles per hour save a lot of time, and then the gains shrink quickly.

Going from 20 mph to 30 mph saves 1 hour 40 minutes. Going from 60 mph to 70 mph saves only about 14 minutes. That is why driving faster rarely rescues a late journey, while leaving ten minutes earlier always does.

Tips for a More Realistic ETA

• Use an average, not a limit. If you are unsure, think back to a similar trip and use the speed you really achieved.
• Measure the route, not the crow's flight. Take the distance from a map app or sat nav route rather than a straight line. If you need the exact postcode of a UK destination first, our postcode finder can look it up.
• Count every stop. Fuel, toilets, food and the five minutes you spend finding your keys all belong in the Breaks box.
• Match traffic to the time of day. A route that is clear at 10:00 PM can need the Heavy setting at 5:00 PM.
• Leave a cushion. In Departure mode, use the Breaks / buffer box for parking, security queues or simply a calm start.
• Check both time zones. When a trip crosses a border, confirm the Start zone and End zone before you press Calculate.
• Update on the road. On a long journey, open the calculator again with the distance remaining and press Now. You get a fresh arrival time based on how the trip is really going.

Final Thoughts

An ETA is only a prediction, but a good one rests on honest numbers. Give the calculator a realistic average speed, count your breaks and choose the right time zones, and it does the rest with exact maths. Bookmark this page for the next time you need an arrival time, a leave by time or the speed needed to make a deadline.

Frequently Asked Questions

Add This ETA Calculator to Your Website

Want this ETA calculator on your own website, blog or intranet page? Copy the iframe code below and paste it where you would like the tool to appear.

1. Press Copy code, or select the text in the box and copy it.
2. Open the page or post you want to edit and switch to its HTML view, or add a Custom HTML block. WordPress, Blogger, Wix, Squarespace and most other platforms offer one.
3. Paste the code, save and preview the page.

If the tool looks cramped in your layout, increase the height value in the code. The width is set to 100%, so it adapts to the space it is given.