Use this tool to calculate what level resonators you will need to use in portals to achieve a link of a desired length, or vice versa.
Example: You want to create a 15 km long link between portals. Input "15000" into the "total distance" field and hit the "Distance" button.

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Total distance (m):
Avg RES lvl:

Calculate based on:

Average resonator level:
Minimum sum of all resonators:
Maximum link range: