What is Pluto's period of revolution around the sun?

Pluto’s period of revolution around the Sun is about 247.7 Earth years. In modern reference values, Pluto’s orbital period is usually given as approximately 247.94 years, so the stored answer is a reasonable rounded approximation.

Pluto takes so long to complete one orbit because it lies in the distant Kuiper belt, averaging about 39 astronomical units from the Sun. One astronomical unit is the average Earth–Sun distance. Pluto’s orbit is also highly elliptical and tilted more than 17 degrees relative to the plane of Earth’s orbit.

Its unusual path once caused confusion about Pluto and Neptune. For part of its orbit, Pluto is closer to the Sun than Neptune, as occurred from 1979 to 1999. The two bodies do not collide because their orbits are locked in a stable 3:2 resonance: Pluto completes two orbits while Neptune completes three. Pluto was discovered in 1930, and it will complete its first full orbit since discovery in 2178.