Intergalactic Travel Energy Calculator

A practical calculator to estimate how much energy would be required for long-distance cosmic travel.

Choose a preset destination or enter your own value.
Mass in tons. Heavier ships require more energy.
Speed as a percentage of light speed.
Higher efficiency lowers required energy.
Round trip includes return energy.
How we calculate

We estimate kinetic energy using ship mass and travel speed, then adjust it by propulsion efficiency and trip type.

  • Speed: percentage of light speed
  • Energy: 0.5 × mass × velocity² ÷ efficiency
  • Round trip: doubles the estimated energy
  • Travel time: distance ÷ speed