Daylight Remaining for Hike Calculator

Enter Calculation

Current time — Hour (0-23)

Current time — Minute (0-59)

Sunset — Hour (0-23)

Sunset — Minute (0-59)

Estimated hike time remaining (hours)

Results

Daylight Remaining

5h 30m

= 5.5 hours until sunset

✓ You have enough daylight

Daylight remaining (hours)	5.5
Buffer (daylight − hike time)	2.5 hours
Safe to continue?	Yes

What this calculator does

The Daylight Remaining for Hike Calculator tells you how many hours and minutes of daylight are left before sunset, and whether that is enough to finish your remaining hike before darkness. Getting caught on the trail after dark is one of the most common reasons hikers need rescue, so a quick daylight check before pressing on is a simple, life-saving habit.

How to use it

Enter the current time (24-hour format), today's sunset time for your location, and your honest estimate of how long the rest of your hike will take in hours. The calculator converts the clock times into decimal hours, subtracts to find daylight remaining, and compares it to your hike estimate. Look up your local sunset time from a weather app or almanac before you start.

The formula explained

Each time is converted to decimal hours (hour + minute \(\div\) 60). Daylight remaining = sunset \(-\) current time. You are considered safe when daylight remaining \(\geq\) estimated hike time. The "buffer" row shows your safety margin: a positive buffer means spare daylight, a negative buffer means you will likely finish in the dark.

$$\text{Buffer} = \left[\left(\text{Sunset Hr} + \frac{\text{Sunset Min}}{60}\right) - \left(\text{Current Hr} + \frac{\text{Current Min}}{60}\right)\right] - \text{Hike Time}$$

Daylight remaining is the gap between now and sunset; you're safe if it exceeds your hike time.

Worked example

It is 13:30 and sunset is at 19:00. Current time = 13.5 hours, sunset = 19.0 hours, so daylight remaining = $$19.0 - 13.5 = 5.5 \text{ hours (5h 30m)}.$$ If your hike will take 3 hours, the buffer is $$5.5 - 3 = 2.5 \text{ hours}$$ — comfortably safe.

A safe outcome (left) finishes before sunset; an unsafe one (right) runs into darkness.

FAQ

Should I plan to finish exactly at sunset? No. Aim for a buffer of at least 1 hour. Light fades and trails become harder to read before the sun fully sets.

Does this account for terrain or fitness? No — it only compares time. Be conservative with your hike-time estimate, especially for downhill, rocky, or unfamiliar terrain.

What if my hike runs past sunset? Carry a headlamp with fresh batteries, slow down, and consider turning back early. The calculator flags this case in red.