And most or all compacts give you the widest angle equivalent in the specs - they'll usually tell you 24mm or 36mm...then have the optical zoom as '5x' or '12x'. So with the compact, just take that wide number, and multiply by the 'x' to get the maximum telephoto in 35mm equivalent.
It's one of those things I always tried to explain to friends with compact ultrazooms who didn't know better. They'd have a 12x camera, and were interested in picking up a 15x camera, because it could reach farther. When I'd tell them it couldn't, they looked at me like I had 2 heads. But their 12x camera was 36mm wide, while the 15x they were considering was 24mm wide. They didn't get the concept - they just saw 'more x' and assumed longer reach.
Sony DSLR-A580 / Sony 18-250mm / Minolta 50mm F1.7 / Sigma 30mm F1.4 / Tamron 10-24mm / Tamron 150-600mm / Tamron 90mm F2.8 macro / Minolta 300mm F4 APO
Sony A6000 / 18-55mm F3.5-5.6 / 55-210mm F4-6.3 / 10-18mm F4 / 35mm F1.8 / 16mm F2.8 / via manual adapter, lots of Pentax K mount, Konica K/AR mount, and Leica M mount manual lenses