What is the ETA Calculator?
The Time of Arrival (ETA) Calculator estimates when you will reach your destination based on the distance you need to cover, your average travel speed, your departure time, and any planned stops or breaks. It is ideal for road trips, deliveries, cycling, running, or any journey where you want a realistic arrival time on a 24-hour clock.
How to use it
Enter the total distance in kilometres, your average speed in km/h, the hour and minute you depart (24-hour format), and the total minutes you expect to spend stopped (fuel, food, rest). The calculator returns your ETA, the pure driving time, and the total trip duration including stops. If the trip crosses midnight, it shows how many days later you arrive.
The formula explained
Travel time equals distance divided by speed: $$t = \frac{d}{s}$$ This is converted to minutes and added to your stop time and your departure time. The arrival is taken modulo 1440 (minutes in a day) to give a clock time, and the number of whole days that elapse is the floor of the total minutes divided by 1440.
$$\begin{gathered} \text{ETA} = \left( T_{dep} + \frac{\text{Distance (km)}}{\text{Speed (km/h)}} \times 60 + \text{Stops (min)} \right) \bmod 1440 \\[1.5em] \text{where}\quad \left\{ \begin{aligned} T_{dep} &= \text{Dep. Hour} \times 60 + \text{Dep. Minute} \\ \text{ETA} &\text{ is in minutes past midnight} \end{aligned} \right. \end{gathered}$$
Worked example
Driving 500 km at 80 km/h gives \(\frac{500}{80} = 6.25\) hours = 375 minutes of driving. Add 45 minutes of stops for 420 minutes total. Leaving at 22:00 (1320 minutes), the arrival is \(1320 + 420 = 1740\) minutes. Dividing by 1440 gives 1 full day over, with a remainder of 300 minutes = 05:00. So you arrive at 05:00 the next day.
FAQ
Does it account for traffic? No — it uses a constant average speed. Lower your average speed to model congestion.
What if I arrive the same day? The "+days" indicator shows "same day" when no midnight is crossed.
Can I use miles? The labels say km, but the math is unit-agnostic: enter miles and mph and the time result is identical.
