Oppervlakte - omskakeling van eenhede

oppervlakte omskakeling tabel
=	mm² vierkante millimeter	cm² vierkante sentimeter	sq in vierkante duim	dm² vierkante desimeter	sq ft vierkante voet	sq yd vierkante erf	m² vierkante meter	a is	acre akker	ha hektaar	km² vierkante kilometer	sq mi vierkante myl
1 mm²	1	0.01	0.00155	0.0001	0.0000108	0.00000120	0.000001	0.00000001	0.000000000247	0.0000000001	0.000000000001	0.000000000000386
1 cm²	100	1	0.155	0.01	0.00108	0.000120	0.0001	0.000001	0.0000000247	0.00000001	0.0000000001	0.0000000000386
1 sq in	645.16	6.452	1	0.0645	0.00694	0.000772	0.000645	0.00000645	0.000000159	0.0000000645	0.000000000645	0.000000000249
1 dm²	10000	100	15.500	1	0.108	0.0120	0.01	0.0001	0.00000247	0.000001	0.00000001	0.00000000386
1 sq ft	92903.04	929.0304	144	9.290	1	0.111	0.0929	0.000929	0.0000230	0.00000929	0.0000000929	0.0000000359
1 sq yd	836127.36	8361.274	1296	83.613	9	1	0.836	0.00836	0.000207	0.0000836	0.000000836	0.000000323
1 m²	1000000	10000	1550.00310	100	10.764	1.196	1	0.01	0.000247	0.0001	0.000001	0.000000386
1 a	100000000	1000000	155000.310	10000	1076.391	119.599	100	1	0.0247	0.01	0.0001	0.0000386
1 acre	4046856422.4	40468564.224	6272640	404685.642	43560	4840	4046.856	40.469	1	0.405	0.00405	0.00156
1 ha	10000000000	100000000	15500031.0000620	1000000	107639.104	11959.900	10000	100	2.471	1	0.01	0.00386
1 km²	1000000000000	10000000000	1550003100.00620	100000000	10763910.417	1195990.0463	1000000	10000	247.105	100	1	0.386
1 sq mi	2589988110336	25899881103.36	4014489600	258998811.0336	27878400	3097600	2589988.110	25899.881	640	258.999	2.590	1