Math & Science
Arrival Time Calculator
Work out when you will arrive — or the latest you can leave and still make it.
Arrival Time Calculator
About the Arrival Time Calculator
Enter a distance, an average speed and a departure time, and this calculator tells you when you will arrive. Add break time and it folds that in too, which is what makes the answer usable for a real journey rather than a physics exercise.
It also runs backwards. Give it the time you need to arrive and it works out the latest you can set off — usually the more useful question when you have a flight to catch or a meeting to reach.
Distance goes in as kilometres, miles, metres or nautical miles; speed as km/h, mph, m/s or knots. Results appear in both 24-hour and 12-hour formats, and the tool handles journeys that run past midnight without breaking.
How to use the Arrival Time Calculator
- Choose whether you want an arrival time or a latest departure.
- Enter the time you are working from.
- Enter the distance and your realistic average speed.
- Add any breaks in minutes.
- Select Calculate. Journeys crossing midnight are flagged.
The formula: time from speed and distance
Travel time = distance ÷ average speed
Arrival = departure + travel time + breaks
Latest departure = required arrival − travel time − breaks
Worked example
A 420 km drive at an average 95 km/h, leaving at 08:30, with 40 minutes of breaks.
Travel time: 420 ÷ 95 = 4.421 hours = 4 h 25 min.
Plus breaks: 4 h 25 min + 40 min = 5 h 05 min.
Arrive at 13:35
Converting the decimal matters here. 4.421 hours is 4 hours and 25 minutes, not 4 hours 42 — multiply the decimal part by 60, do not read it as minutes.
Choosing a realistic average speed
The commonest mistake is entering the speed limit. Your true average includes junctions, roundabouts, towns, traffic and the slow first and last miles. Actual door-to-door averages come out well below the posted limit.
| Journey type | Realistic average | Notes |
|---|---|---|
| Motorway, light traffic | 100–110 km/h (62–68 mph) | Below the limit even when clear |
| Motorway, mixed | 85–95 km/h (53–59 mph) | Typical long-drive figure |
| Main roads | 65–80 km/h (40–50 mph) | Junctions and villages |
| Rural lanes | 45–60 km/h (28–37 mph) | Bends and single track |
| Urban driving | 20–35 km/h (12–22 mph) | Lights dominate |
| Cycling, road | 20–28 km/h (12–17 mph) | Terrain-dependent |
| Walking | 5 km/h (3.1 mph) | 4 km/h with hills or a load |
A good rule for long drives: take the speed limit and subtract about 15%. That absorbs the ordinary friction of a journey without assuming anything has gone wrong.
Planning breaks properly
Breaks are not padding — on a long drive they are a safety requirement, and they shape the arrival time more than most people allow for.
- Every two hours is the standard driver-fatigue advice, at 15 minutes or so.
- Fuel or charging — 5–10 minutes for fuel; 20–40 for a meaningful EV charge.
- Meals — 30 to 45 minutes, realistically.
- Travelling with children — assume more stops and longer ones.
A 420 km drive needs at least two short breaks. Entering 40 minutes total is not conservative; it is the minimum.
Working backwards to a departure time
Switch the tool to solve for departure and it subtracts instead of adding. For a 09:00 arrival after a 2 h 20 min journey, you leave at 06:40.
Then add a buffer on top, sized to what happens if you are late:
- Flight — 60 to 90 minutes beyond the calculated departure, before airport processing.
- Job interview — 30 minutes, and plan to wait nearby rather than arrive on the dot.
- Ferry or train — 30 to 45 minutes; departures do not wait.
- Ordinary appointment — 15 minutes is usually enough.
What this calculator does not know
It applies a constant average speed. It has no live traffic data, no route knowledge, no weather and no roadworks. On a route with a known bottleneck — a city ring road at rush hour, a single-carriageway stretch, a border crossing — a mapping app with live data will beat it. Use this for planning around a distance and a realistic average, then check conditions before you leave.
For the speed itself from a distance and time, use the velocity calculator. To add or subtract spans of time directly, try the time calculator.
How long does it take to drive?
Driving time = distance ÷ average speed. This table shows moving time only — add your stops on top.
| Distance | City (30 mph) | Mixed (60 mph) | Highway (70 mph) |
|---|---|---|---|
| 5 miles | 10 min | 5 min | 4 min |
| 10 miles | 20 min | 10 min | 9 min |
| 20 miles | 40 min | 20 min | 17 min |
| 30 miles | 1 h | 30 min | 26 min |
| 50 miles | 1 h 40 min | 50 min | 43 min |
| 100 miles | 3 h 20 min | 1 h 40 min | 1 h 26 min |
| 200 miles | 6 h 40 min | 3 h 20 min | 2 h 51 min |
| 300 miles | 10 h | 5 h | 4 h 17 min |
| 500 miles | 16 h 40 min | 8 h 20 min | 7 h 9 min |
Real trips rarely hold the speed limit. Traffic, lights and fuel stops pull the average down. For a long highway trip, 55–60 mph is a more honest average than 70.
What is an ETA?
ETA stands for estimated time of arrival — the clock time you expect to get there. It is departure time plus travel time plus breaks.
Worked example
You leave at 8:30 am for a 200-mile trip and average 60 mph, with one 20-minute stop.
200 ÷ 60 = 3 h 20 min. Add 20 min of breaks: 3 h 40 min.
ETA: 12:10 pm
A map app knows live traffic and this calculator does not. Use this for planning and "what if" questions, such as how much time a faster average would save.
Flight time estimator: how long is the flight?
Planes cruise at roughly 500–575 mph, but take-off, climb and landing add time. A good rough rule:
Flight time ≈ distance (miles) ÷ 500 + 30 minutes
New York to Los Angeles is about 2,450 miles: 2,450 ÷ 500 = 4.9 hours, plus 30 minutes, gives about 5 hours 25 minutes. Real flights vary with winds — westbound flights across the US often take 30–60 minutes longer than eastbound ones. Use this as a plane trip time calculator, then enter the result above with your departure time to see your arrival time.
Distance to time converter
This tool is a time calculator with speed and distance built in. Time = distance ÷ speed, so 150 miles at 60 mph takes 2.5 hours, or 2 hours 30 minutes. To turn decimal hours into hours and minutes, multiply the decimal part by 60: 0.5 hours is 30 minutes and 0.75 hours is 45 minutes.
Other ways to use this calculator
Any trip with a distance and an average speed works here.
- Travel time calculator for driving — enter miles or kilometres and your realistic average speed, plus stops.
- Boat travel time calculator — choose nautical miles and knots.
- Flight travel time calculator — enter the distance and cruise speed for an estimate; add time for taxi, climb and descent.
- ETA calculator and drive time calculator — enter distance, speed and departure time.
- What time will I arrive? — the result shows your arrival clock time.
- Journey time — how long does it take to drive 50 miles? At 60 mph, 50 minutes; at 40 mph, 1 hour 15 minutes.
Frequently asked questions
Divide the distance by your average speed. A 420 km drive at 95 km/h takes 420 ÷ 95 = 4.42 hours. Convert the decimal properly — multiply 0.42 by 60 to get 25 minutes, so the journey is 4 h 25 min, not 4 h 42. Then add break time for the real figure. Keep distance and speed in matching units, or convert first.
Well below the speed limit. For long motorway drives, 85–95 km/h (53–59 mph) is realistic once junctions, towns and traffic are counted; main roads run 65–80 km/h and urban driving 20–35. A reliable rule is to take the speed limit and subtract about 15%. Using the limit itself will consistently make you arrive later than the calculator predicted.
Work backwards: subtract the travel time and your breaks from the arrival time you need. A 2 h 20 min journey to a 09:00 appointment means leaving at 06:40. Then add a buffer sized to the consequences of being late — 15 minutes for an ordinary appointment, 30 for an interview, and 60 to 90 for a flight before airport processing.
No. It applies a constant average speed with no live traffic, weather, roadworks or route knowledge. You can allow for congestion by entering a lower average speed — that is what the realistic figures in the table above are for. For a route with a known bottleneck, check a mapping app with live data before setting off and use this for the broader plan.
About 1 hour 40 minutes at an average of 60 mph, or 1 hour 26 minutes at 70 mph. In city traffic averaging 30 mph it takes about 3 hours 20 minutes. Add time for stops.
Sources and further reading
- NIST — Guide for the Use of the International System of Units — distance, speed and time units and conversions
- UK Highway Code — Rule 91, driver fatigue and breaks — the two-hour break guidance used above
- Speed — Encyclopaedia Britannica — the distance–speed–time relationship