Hours to Nanoseconds (h to ns)

1 hour equals 3,600,000,000,000 nanoseconds exactly.

1 hour = 3,600,000,000,000 nanoseconds

How to convert hours to nanoseconds

To convert hours to nanoseconds, multiply the number of hours by 3,600,000,000,000. This factor is exact. To go the other way, multiply nanoseconds by 2.777777778×10⁻¹³ (rounded).

nanoseconds = hours × 3,600,000,000,000

Example: 10 hours = 36,000,000,000,000 nanoseconds.

Months and years are not constant. This site uses the average Gregorian year of 365.2425 days, so one 'year' converts to 365.2425 days, not 365; use 'common year' for exactly 365 days.

About these units

Hour (h)

Metric (SI)Current unit

60 minutes or 3,600 seconds, one twenty-fourth of a mean solar day.

Egyptian astronomers gave us the twelve. Coffin lids from about 2150 BC show the night divided into exactly 12 intervals, tied to the rising of star groups called decans, and the day was later split into 12 hours with sundials. These were seasonal hours, a twelfth of the daylight, so a summer hour was longer than a winter one. The word itself comes from Greek hora, originally any span of time, through Latin and Old French into English in the 13th century.

Equal hours of 1/24 of a day were probably first proposed by Hipparchus, and mechanical clocks made them the practical choice, since a clock showing seasonal hours had to be readjusted every morning and evening. Today the hour is exactly 3,600 seconds and is a non-SI unit accepted for use with the SI. Civil time still bends it a little: UTC hours have lasted 3,601 seconds 27 times since 1972 to keep clocks within 0.9 seconds of the Earth's rotation. In practice we use it for working shifts, travel times and electricity bills measured in kilowatt-hours.

1 hour = 3,600 seconds (exactly).

Sources: Wikipedia: Hour; BIPM: SI Brochure, 9th edition

Nanosecond (ns)

Metric (SI)Current unit

One billionth of a second. Light travels about 30 cm in a nanosecond.

Few units are as easy to picture as the nanosecond, because light makes it concrete. In a vacuum, light needs about 3.34 nanoseconds to travel one metre and about 1.02 nanoseconds to travel one foot. That is why engineers talk about wire lengths and signal delays in the same breath once clocks reach the gigahertz range, where the cycle time of a 1 GHz signal is exactly one nanosecond.

A nanosecond is one billionth of a second, and the ratio is hard to grasp: one nanosecond is to one second as one second is to about 31.7 years. It is the natural unit of fast digital hardware. A 74HC-series logic chip common in the mid-1980s had a typical propagation delay of about 8 ns, and the gap between packets on Gigabit Ethernet is 96 ns. The Go language's time package offers 1 ns precision.

1 nanosecond = 1×10⁻⁹ seconds (exactly).

Sources: Wikipedia: Nanosecond; BIPM: SI Brochure, 9th edition

Related conversions

See all time units.