1" = 2.54cm is not rounded off. It is precise. All conversions of length, area, weight, and volume can be derived from this one fact, so this is the only one you need to memorize. Everything else can be calculated.
The answer is 241.3 cm (approx.). Inches and centimeters are both units of linear measurement. Inches are used in the imperial system whereas centimeters are used in the metric system. To convert from inches to cm, multiply the inch unit by 2.54.