120 kilometres per hour
120 km/hSpeed · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Speed
Just how fast is 120 kilometres per hour?
Road & rail
120 km/h
DISTANCE IN ONE SECOND
120 kilometres per hour
The quantity is exact as entered.
120 km/hSpeed
0
33.33 m in 1 s
Family car
A family car is a motor vehicle designed to carry several passengers and their belongings.
100 km/hExample cruising speed
0
27.78 m in 1 s
Each track shows distance covered in the same second. The small illustrations identify the movers; their sizes are schematic.
A little perspective
120 kilometres per hour is about 1.2 times the example cruising speed of a family car.
Measurements, assumptions & sources +
120 kilometres per hour
Speed: 120 km/h; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Family car
Example cruising speed: 100 km/h; example.
A 4.5 m long car with 1,500 kg mass; vehicle models and loading vary.
Defined examples — our methodology
The marked example cruising speed is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 120 kilometres per hour with the example cruising speed of a family car. The notes below explain how each value was chosen.
Family car
100 km/hExample cruising speed · example
A 4.5 m long car with 1,500 kg mass; vehicle models and loading vary.
- Comparing
- Speed ↔ Example cruising speed
- Relative size
- 120 kilometres per hour is about 1.2 times the example cruising speed of a family car. 120 kilometres per hour is approximately 20% greater than the example cruising speed of a family car.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- The example cruising speed of a family car: This is an illustrative comparison value, not a claim that every example is the same.
Speed is distance per unit time; it does not specify the total distance travelled.
33.333 m/smetres per second
74.565 mphmiles per hour
Mach 0.097182Mach
1.1119 × 10⁻⁵% of c (1.1119 × 10⁻⁷c)speed of light
Change your perspective
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A little smaller. A little larger.