rough order-of-magnitude estimate (An estimate done without detailed costing, or based on initial or incomplete data. It estimates the general size and scope of a project); rough order-of-magnitude estimate (An estimate done without detailed costing, or based on initial or incomplete data. It estimates the general size and scope of a project. Rori)

construct.

ballpark estimate (akimboesenko)

econ.

crude estimation; eye estimate; rough estimates; rough estimation

IT

crude guess; raw count

Makarov.

raw estimation

math.

rough bound; crude estimate

psychol.

gross score