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평균 속도 계산기

속도, 거리, 시간을 정확하게 계산하는 가장 빠른 방법입니다.

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Average Speed Definition

Average speed equals the total distance traveled divided by the total time taken to cover that distance. The Average Speed Calculator computes this value in miles per hour (mph), kilometers per hour (km/h), meters per second (m/s), and feet per second (ft/s).

Average speed is a scalar quantity — it has magnitude but no direction. A car that drives 200 miles (321.9 km) in 4 hours has an average speed of 50 mph (80.5 km/h), regardless of the route taken or direction changes during the trip.

The Speed Distance Time Calculator uses 3 variables: speed, distance, and time. Knowing any 2 of these values lets you calculate the third using the average speed formula.

Build the Definition

Click the correct terms to complete the formula

Average Speed =
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Average Speed Formula

The Average Speed formula is Speed = Distance / Time (s = d/t). 이 공식에는 알 수 없는 변수를 해결하는 3가지 재배열이 있습니다.

  1. s = d / t — speed equals distance divided by time
  2. d = s × t — distance equals speed times time
  3. t = d / s — time equals distance divided by speed

The output unit depends on the input units. Distance in miles and time in hours produces miles per hour (mph). Distance in kilometers and time in hours gives kilometers per hour (km/h). Distance in meters and time in seconds yields meters per second (m/s).

Formula Triangle

Click any variable to see its formula

D S T DISTANCE SPEED TIME
Click a variable above

How to Calculate Average Speed

To calculate the average speed, follow these 3 steps:

  • Step 1: Measure the total distance traveled in miles, kilometers, or meters. Use a car's odometer, Google Maps, or a GPS device to record the distance.
  • Step 2: Record the total time taken in hours, minutes, or seconds. Subtract any rest stops from the total trip duration to get actual travel time.
  • Step 3: Divide distance by time 공식을 사용하여: 속도 = 거리 / 시간 (s = d/t) .

Example: A car covers 250 miles (402.3 km) in 5 hours. Average speed = 250 / 5 = 50 mph (80.5 km/h).

For trips with stops, subtract idle time. A bus travels 180 miles (289.7 km) in 4 hours with 30 minutes of stops. Travel time = 3.5 hours. Average speed = 180 / 3.5 = 51.4 mph (82.8 km/h).

Step-by-Step Walkthrough

Click each step to complete it

1
Measure distance: 250 miles (402.3 km)
2
Record time: 5 hours (no stops)
3
Calculate: 250 ÷ 5 = 50 mph (80.5 km/h)

How to Use this Average Speed Calculator

To use this Average Speed Calculator, follow 3 steps:

  • Step 1: Select the calculation mode — choose Speed, Distance, or Time from the mode selector at the top of the calculator.
  • Step 2: Enter known values into the distance input and time input fields. Select the measurement units from the dropdown menus (miles, kilometers, meters, hours, minutes, seconds).
  • Step 3: Click the calculate button to view results in the result display area. The calculator shows the answer with a step-by-step formula breakdown and automatic unit conversions.

The Average Speed Calculator supports input in hh:mm:ss format and converts between mph, km/h, m/s, and ft/s automatically.

Calculator Guide

Click each step to walk through the process

1
Select mode: Speed / Distance / Time
2
Enter values: Distance = 120 mi, Time = 2 hr
3
Result: 60 mph (96.6 km/h)

Average Speed Calculator With Distance and Time

거리와 시간을 포함한 평균 속도를 계산하려면 총 이동 거리와 이동 시간을 속도 거리 시간 계산기에 입력하세요. 공식 속도 = 거리 / 시간 (s = d/t) 결과를 만들어냅니다.

Example 1: A cyclist rides 30 miles (48.3 km) in 2 hours. Average speed = 30 / 2 = 15 mph (24.1 km/h).

Example 2: A train covers 200 kilometers (124.3 miles) in 2.5 hours. Average speed = 200 / 2.5 = 80 km/h (49.7 mph).

The Average Speed Calculator accepts distance in miles, kilometers, or meters and time in hours, minutes, or seconds. The formula engine handles all unit conversions automatically.

Quick Speed Calculator

Enter distance and time to calculate speed

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Average Speed Calculator Without Time

To find travel time without knowing time directly, rearrange the average speed formula to 시간 = 거리 / 속도 (t = d/s) . Enter the known distance and speed values to compute travel time.

To find distance when distance is unknown, use distance = speed × time (d = s × t) .

Example: A bus travels 120 miles (193.1 km) at an average speed of 40 mph (64.4 km/h). Time = 120 / 40 = 3 hours.

This rearrangement is useful for trip planning — enter the distance from Google Maps and the expected average speed to estimate the total trip duration before departure.

Time Finder

Adjust distance and speed to compute travel time

Time = 2.50 hours (2h 30m)

Average Speed Calculator for Multiple Speeds

The correct method to calculate average speed for equal distances at different speeds is the harmonic mean, not the arithmetic mean. The arithmetic mean gives an incorrect result because the object spends more time at the slower speed.

Average Speed = 2 × (S₁ × S₂) / (S₁ + S₂)

Example: A car drives 60 mph (96.6 km/h) for the first half and 40 mph (64.4 km/h) for the second half of an equal-distance trip. The arithmetic mean = 50 mph (wrong). The harmonic mean = 2 × (60 × 40) / (60 + 40) = 48 mph (77.2 km/h) (correct).

The harmonic mean produces a lower value than the arithmetic mean because the vehicle spends more time traveling at the slower speed, which pulls the average speed calculation down.

Harmonic Mean Calculator

Enter 2 speeds for equal distances — see correct vs incorrect average

✗ Arithmetic Mean (Wrong)
50.00 mph
✓ Harmonic Mean (Correct)
48.00 mph

Average Speed Calculator with Hours and Minutes

Convert time in hours, minutes, and seconds (hh:mm:ss) to decimal hours before applying the Average Speed formula. The conversion formula:

Decimal Hours = Hours + (Minutes / 60) + (Seconds / 3600)

Example: 2 hours 30 minutes 45 seconds = 2 + (30/60) + (45/3600) = 2 + 0.5 + 0.0125 = 2.5125 hours.

A trip of 150 miles (241.4 km) in 2 hours 30 minutes 45 seconds = 150 / 2.5125 = 59.7 mph (96.1 km/h).

The Average Speed Calculator accepts time in hh:mm:ss format directly and converts to decimal hours automatically.

Time Format Converter

Enter hours, minutes, seconds to get decimal hours

Decimal Hours 2.5125 hours

Average Speed Calculator for Multiple Legs

For trips with multiple legs, add the total distance traveled across all segments and divide by the total time taken. Each leg may have a different speed and distance across varying terrain types.

Example: A delivery van completes 3 legs:

  • 다리 1: 2시간 동안 193.1km(120마일) = 60 mph
  • 다리 2: 1.5시간 동안 90마일(144.8km) = 60 mph
  • 다리 3: 1시간 동안 60마일(96.6km) = 60 mph

Total distance = 270 miles (434.5 km). Total time = 4.5 hours. Average speed = 270 / 4.5 = 60 mph (96.6 km/h).

This method applies for last-mile delivery vans, bicycle courier routes, and any multi-segment journey with stops.

Multi-Leg Calculator

Enter distance and time per leg — totals update live

Leg Distance (mi) Time (hrs) Speed (mph)
Leg 1 60.0
Leg 2 60.0
Leg 3 60.0
Total 270.0 4.50 60.00

Units of Average Speed

Average speed uses distance-per-time units. The 4 most common units are:

  • 1. Miles per hour (mph) — used in the United States and United Kingdom for road speed
  • 2. Kilometers per hour (km/h) — used in most countries worldwide for automotive speed
  • 3. Meters per second (m/s) — the SI base unit for speed, used in scientific contexts
  • 4. Feet per second (ft/s) — used in engineering and some physics applications

Conversion factors: 1 mph = 1.60934 km/h = 0.44704 m/s = 1.46667 ft/s. The metric unit of speed in the International System of Units (SI) is meters per second (m/s).

Live Unit Converter

Enter a speed value and select the input unit

60.000 mph
96.561 km/h
26.822 m/s
88.000 ft/s

Average Speed vs. Average Velocity

Average speed is a scalar quantity — it equals total distance traveled divided by total time taken and has no direction. Average velocity is a vector quantity — it equals total displacement divided by total time and includes direction.

For a round trip with the same start and end point, average speed is greater than zero because total distance traveled is always positive. Average velocity for a round trip equals zero because displacement (net change in position) equals zero.

Example: A car drives 100 miles (160.9 km) east and returns 100 miles west in 4 hours total. Total distance = 200 miles (321.9 km). Displacement = 0 miles. Average speed = 200 / 4 = 50 mph. Average velocity = 0 / 4 = 0 mph. Use the Displacement Calculator to find displacement for specific paths.

Average Speed

Scalar quantity (magnitude only)

= Total Distance / Time

Always ≥ 0

Round trip: 50 mph

VS
Average Velocity

Vector quantity (magnitude + direction)

= Displacement / Time

Can be zero or negative

Round trip: 0 mph

왕복 경로

점이 앞뒤로 이동하는 것을 지켜보세요. 거리가 증가하고 변위가 0으로 돌아갑니다.

시작/종료 반환점

Average Speed vs Instantaneous Speed

Average speed covers the entire trip — total distance traveled divided by total time taken. Instantaneous speed is the speed at one specific moment, displayed on a speedometer or GPS device.

A car's speedometer shows instantaneous speed, which changes constantly during a trip. Average speed smooths all these speed variations into a single value for the entire journey.

Example: A car trip shows speedometer readings between 30 mph (48.3 km/h) and 70 mph (112.7 km/h) at various moments during peak congestion periods and highway stretches. The average speed for the entire 120-mile (193.1 km) trip over 2 hours = 60 mph (96.6 km/h).

Speedometer Comparison

Average stays constant while instantaneous fluctuates

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평균: 꾸준함
0102030405060708090100
즉석: 다양함

Average Speed Vs Constant Speed

Constant speed means an object covers equal distances in equal time intervals throughout the journey. Average speed equals total distance traveled divided by total time taken over the entire trip.

When an object moves at constant speed, average speed equals that constant speed. When speed varies — due to acceleration, deceleration, or stops — average speed differs from the speed at any given moment.

Example 1: A car using cruise control at 60 mph (96.6 km/h) on a highway has both a constant speed and an average speed of 60 mph.

Example 2: A car in city traffic varies between 0 mph and 45 mph (72.4 km/h) during school zone hours and peak congestion periods, with an average speed of 25 mph (40.2 km/h).

Constant vs Varying Speed

Both dots finish at the same time — same average speed, different patterns

Constant
Varying

Average Speed from Speed-Time Graph

The area under a speed-time graph represents total distance traveled. To find average speed from a speed-time graph, follow 3 steps:

  1. Calculate the total area under the speed curve using geometric shapes (rectangles, triangles, trapezoids).
  2. Read the total time from the horizontal axis (start to end).
  3. Divide total area by total time: Average Speed = Total Area / Total Time.

For a rectangular region at constant speed, area = speed × time. For a triangular region with uniform acceleration from zero, area = ½ × base × height.

Speed-Time Graph

The shaded area equals total distance traveled

Average Speed from Velocity-Time Graph

A velocity-time graph shows velocity (speed with direction) over time. The area under the curve represents displacement, not total distance.

  1. Areas above the time axis indicate positive displacement (forward movement).
  2. Areas below the time axis indicate negative displacement (backward movement).

To find total distance from a velocity-time graph, sum the absolute values of all areas. Average speed = total distance / total time. Average velocity = net displacement / total time.

Velocity-Time Graph

Blue area = forward distance, Red area = backward distance

Common Mistakes When Calculating Average Speed

There are 5 common mistakes when calculating average speed. Click each card below to see the explanation and how to avoid the error.

Common Error
Using Arithmetic Mean Instead of Harmonic Mean
동일한 거리에 걸쳐 서로 다른 속도에 대한 평균 속도를 계산할 때 산술 평균이 잘못된 결과를 제공합니다. 조화 평균을 사용합니다. 평균 속도 = 2 x (S1 x S2) / (S1 + S2) . 차량은 더 느린 속도에서 더 많은 시간을 소비하므로 실제 평균이 단순 평균보다 낮아집니다.
->을 보려면 클릭하세요.
Common Error
Forgetting to Subtract Rest Stops
Average speed uses actual travel time, not total elapsed time. Subtract rest stops, refueling breaks, and idle time from the total trip duration before dividing. A 5-hour trip with 1 hour of stops has 4 hours of travel time.
->을 보려면 클릭하세요.
Common Error
Mixing Units Without Converting
Distance in miles with time in minutes produces an incorrect result unless converted. Convert minutes to hours (divide by 60), or kilometers to miles (multiply by 0.621371), before applying the formula speed = distance / time.
->을 보려면 클릭하세요.
Common Error
Confusing Speed with Velocity
평균 속도는 총 거리(스칼라, 항상 양수)를 사용합니다. 평균 속도는 변위를 사용합니다(벡터, 왕복 여행의 경우 0일 수 있음). 100마일을 갔다가 100마일을 뒤로 운전하는 자동차의 평균 속도는 0보다 크지만 평균 속도는 0입니다.
->을 보려면 클릭하세요.
Common Error
Using Instantaneous Readings for Average
A speedometer or GPS shows instantaneous speed at one moment, not average speed. Average speed requires total distance traveled divided by total time taken. Instantaneous speed readings during peak congestion periods or highway stretches do not represent the overall average.
->을 보려면 클릭하세요.

Average Speed Examples and Practice Questions

Practice these 5 average speed calculation problems. Click "Show Solution" to see the step-by-step answer for each question.

Q1: A runner covers 10 km (6.21 miles) in 50 minutes. Calculate the runner's average speed in km/h and mph.

Step 1: Convert time: 50 minutes = 50 / 60 = 0.833 hours.

Step 2: Apply formula: Speed = Distance / Time = 10 / 0.833 = 12.0 km/h.

Step 3: Convert: 12.0 km/h × 0.621371 = 7.46 mph.

Q2: A car travels 180 miles (289.7 km) in 3 hours 15 minutes. Find the average speed in mph.

Step 1: Convert time: 3h 15m = 3 + (15/60) = 3.25 hours.

Step 2: Apply formula: Speed = 180 / 3.25 = 55.38 mph (89.13 km/h).

Q3: A cyclist rides 25 km (15.53 miles) at 20 km/h, then 25 km at 30 km/h. Calculate the average speed for the entire trip.

Step 1: Time for leg 1: 25 / 20 = 1.25 hours.

Step 2: Time for leg 2: 25 / 30 = 0.833 hours.

Step 3: Total distance = 50 km. Total time = 2.083 hours.

Step 4: Average speed = 50 / 2.083 = 24.0 km/h (14.91 mph). Note: the answer is NOT 25 km/h (the arithmetic mean).

Q4: A train departs at 9:00 AM and arrives at 11:45 AM, covering 330 km (205 miles). Find the average speed.

Step 1: Calculate time: 11:45 - 9:00 = 2 hours 45 minutes = 2.75 hours.

Step 2: Apply formula: Speed = 330 / 2.75 = 120 km/h (74.56 mph).

Q5: A car drives 60 km at 40 km/h and returns at 60 km/h. Find the average speed for the round trip.

Step 1: Time going: 60 / 40 = 1.5 hours.

Step 2: Time returning: 60 / 60 = 1.0 hours.

Step 3: Total distance = 120 km. Total time = 2.5 hours.

Step 4: Average speed = 120 / 2.5 = 48 km/h (29.83 mph). The harmonic mean gives the correct answer for equal-distance round trips.

기타 평균 속도 계산기

평균 속도 계산기 제품군은 사이클링과 하이킹부터 가스 분자 물리학, 궤도 역학, 광대역 테스트 및 읽기 속도에 이르기까지 발생할 수 있는 모든 속도 문제를 다룹니다. 아래의 각 계산기는 고유한 수식, 입력 및 대화형 시각화를 통해 해당 시나리오에 맞게 특별히 제작되었습니다.

자주 묻는 질문

총 이동 거리와 총 소요 시간은 평균 속도를 계산하는 데 필요한 2가지 측정값입니다. 속도 = 거리 / 시간(s = d/t) 공식은 이 두 값을 사용하여 시간당 마일(mph), 시간당 킬로미터(km/h) 또는 초당 미터(m/s)로 결과를 생성합니다.

특정 시간 간격 동안 이동한 거리를 측정하고 경과 시간으로 나눕니다. 간격의 평균 속도 = 간격 거리 / 간격 시간. 이는 해당 구간에 대한 평균 이동 속도를 제공합니다.

아니요, 평균 속도는 항상 0이거나 양수입니다. 평균 속도는 총 거리(항상 양수)를 총 시간(항상 양수)으로 나눈 스칼라 수량입니다. 속도에는 방향이 포함되므로 평균 속도는 음수가 될 수 있습니다.

달리기에 적합한 평균 속도는 초보자의 경우 5 mph(8 km/h)부터 중급 주자의 경우 6-8 mph(9.7-12.9 km/h)입니다. 엘리트 마라톤 주자는 12-13 mph(19.3-20.9 km/h)를 유지합니다. 달리기 속도 계산기나 GPS 장치를 사용하여 마라톤 속도 전략 중 달리기 속도를 추적하세요.

사이클링에 적합한 평균 속도는 일반 라이더의 경우 12-15 mph(19.3-24.1 km/h), 일반 자전거 라이더의 경우 15-20 mph(24.1-32.2 km/h), 경쟁적인 라이더의 경우 20-28 mph(32.2-45.1 km/h)입니다. 자전거 타는 사람. 속도는 기어비 조정, 타이어 공기압, 지형 유형에 따라 달라집니다.

모든 구간에 걸쳐 이동한 총 거리를 더합니다. 정차한 시간을 제외하고 정류장 간 총 이동 시간을 더합니다. 총 거리를 총 이동 시간으로 나눕니다. 평균 속도 = 총 거리 / 총 이동 시간.

예, 공식을 시간 = 거리 / 속도(t = d/s)로 다시 정리하세요. 이동 시간을 시간, 분 또는 hh:mm:ss 형식으로 계산하려면 평균 속도 계산기에 거리와 평균 속도를 입력하세요.

아니요, 평균 속도와 평균 속도는 서로 다른 양입니다. 평균 속도는 총 이동 거리를 사용합니다(스칼라, 항상 >= 0). 평균 속도는 변위를 사용합니다(벡터, 방향 포함, 왕복의 경우 0일 수 있음). 속도 기반 계산에는 Displacement Calculator을 사용합니다.

거리는 킬로미터 단위, 시간은 시간 단위로 측정한 후 평균 속도(km/h) = 거리(km) / 시간(시간)으로 나눕니다. 예: 2시간에 150km = 75 km/h (46.6 mph). 1.60934를 곱하여 mph을 km/h로 변환합니다.

거리는 마일 단위로, 시간은 시간 단위로 측정한 후 평균 속도(mph) = 거리(마일) / 시간(시간)으로 나눕니다. 예: 2시간에 120마일 = 60 mph (96.6 km/h). 0.621371을 곱하여 km/h을 mph로 변환합니다.

예, 총 이동 거리가 0인 경우에만 평균 속도가 0입니다. 즉, 물체가 전혀 움직이지 않았습니다. 모든 이동은 시작점으로 돌아가더라도 총 거리가 양수이기 때문에 평균 속도가 0보다 큽니다.

양방향 거리를 더해 총 거리를 구합니다. 양방향 시간을 더해 총 시간을 구합니다. 총 거리를 총 시간으로 나눕니다. 산술적으로 두 속도의 평균을 계산하지 마십시오. 동일한 거리에 대한 조화 평균(Average Speed = 2 x (S1 x S2) / (S1 + S2))을 사용하십시오.

알려진 다른 값에서 거리를 도출하도록 공식을 다시 정렬한 다음 속도 = 거리 / 시간을 적용합니다. 거리나 속도 기준이 없으면 평균 속도를 계산할 수 없습니다. 3가지 변수(속도, 거리, 시간) 중 최소 2가지를 알아야 합니다.

거리-시간 그래프의 기울기는 속도를 나타냅니다. 전체 주행의 평균 속도 = 그래프의 시작점부터 끝점까지의 총 상승(거리 변화) / 총 주행(시간 변화)입니다. 경사가 가파르면 속도가 빨라집니다.

시간 축 아래 영역에 대한 절대값을 사용하여 속도-시간 곡선 아래의 전체 영역을 계산합니다. 총 거리 = 모든 절대 면적의 합입니다. 평균 속도 = 총 거리 / 총 시간. 평균 속도 = 순 변위(위 영역 - 아래 영역) / 총 시간.

평균 속도는 스칼라 수량입니다. 크기(mph 또는 km/h과 같은 단위의 숫자)는 있지만 방향은 없습니다. 평균 속도는 크기와 방향을 모두 포함하는 벡터 대응물입니다. 속도 및 거리와 같은 스칼라 양은 속도 및 변위와 같은 벡터 양과 다릅니다.