A Class Dimentions Compared

2004 Make/model Length (mm) Length (ft) Width (mm) Width (ft) Height (mm) Height (ft) Front hdrm (mm) Front hdrm (ft) Front legrm (mm) Front legrm (ft) Rear hdrm (mm) Rear hdrm (ft) Rear kneerm (mm) Rear kneerm (ft) Boot space (min ltr) Boot space (max ltr)
VW Lupo 3527 11.57 1908 6.26 1460 4.79 990 3.25 1038 3.41 945 3.10 802 2.63 130 830
Mercedes A-Class (SWB) 3606 11.83 1719 5.64 1575 5.17 977 3.21 1060 3.48 932 3.06 699 2.29 350 1000
Toyota Yaris (5 dr) 3640 11.94 1660 5.45 1500 4.92 * * * * * * * * * *
Mini One 3626 11.90 1925 6.32 1369 4.49 * * * * * * * * 160 0
Mercedes A-Class (LWB) 3776 12.39 1719 5.64 1589 5.21 988 3.24 1060 3.48 940 3.08 869 2.85 350 1580
Audi A2 3826 12.55 1673 5.49 1553 5.10 994 3.26 1100 3.61 985 3.23 840 2.76 390 1140
Peugeot 206 (5 dr) 3835 12.58 1652 5.42 1426 4.68 896 2.94 * * 851 2.79 * * 245 1130
Honda Jazz 3830 12.57 1675 5.50 1525 5.00 935 3.07 1060 3.48 880 2.89 730 2.40 353 1323
Toyota RAV4 3dr 3870 12.70 1735 5.69 1695 5.56 1024 3.36 1026 3.37 * * * * 150 690
VW Polo (5 dr) 3897 12.79 1650 5.41 1465 4.81 986 3.23 1050 3.44 958 3.14 818 2.68 270 1030
Ford Fiesta (5 dr) 3917 12.85 1683 5.52 1432 4.70 999 3.28 1058 3.47 959 3.15 885 2.90 284 947
Fiat Idea (5 dr) 3930 12.89 1930 6.33 1660 5.45 1029 3.38 1067 3.50 991 3.25 711 2.33 320 1420
Skoda fabia (5 dr) 3960 12.99 1646 5.40 1452 4.76 977 3.21 1100 3.61 952 3.12 846 2.78 260 1016
Ford Fusion 4020 13.19 1708 5.60 1503 4.93 * * * * * * * * * *
Vauxhall Meriva 4042 13.26 1694 5.56 1624 5.33 1050 3.44 1090 3.58 940 3.08 1020 3.35 350 1410
Honda HR-V 5dr 4110 13.48 1695 5.56 1670 5.48 * * * * * * * * 283 630
Citroen Berlingo (5 dr) 4137 13.57 1724 5.66 1819 5.97 * * * * * * * * 625 2800
Toyota Carolla 3dr 4180 13.71 1710 5.61 1475 4.84 995 3.26 1050 3.44 970 3.18 896 2.94 289 *
Renault Scenic (5 dr) 4259 13.97 1805 5.92 1621 5.32 955 3.13 * * 878 2.88 * * 430 1840
Toyota RAV4 XT4 5dr 4265 13.99 1785 5.86 1705 5.59 1024 3.36 1026 3.37 991 3.25 764 2.51 410 970
Mercedes C-Class 4 dr 4526 14.85 1728 5.67 1426 4.68 987 3.24 * * 948 3.11 * * 455 0
Toyota Avensis (5 dr) 4630 15.19 1760 5.77 1480 4.86 990 3.25 1181 3.87 950 3.12 * * 510 1320
No Data = *
Other notes: Boot space is particularly interesting, a number of larger cars have much less space, than the A-Class. 
Also, due to the shape of the rear window, many cars do not have enough room for a large dog, the A-Class does!
Data obtained from http://www.whatcar.co.uk/RoadTest_Home.asp