Area (Superficie)

Sistema Británico y en EE UU

Sistema Métrico Decimal

1 square inch

(sq in)

=

6.452 square centimetres

144 square inches

=

1 square foot

(sq ft)

=

929.03 square centimetres

9 square feet

=

1 square yard

(sq yd)

=

0.836 square metre

4840 square yards

=

1 acre

(yd)

=

0.405 hectare

640 acres

=

1 square mile

=

2.59 square kilometres or
259 hectares

Examples:
They have a 200-acre farm
The fire destroyed  40 square miles of woodland.

Capacity (Capacidad)

Sistema Británico

Sistema Métrico Decimal

1 pint

(pt)

=

0.568 litre

(l)

8 pints

=

1 gallon

(gall)

=

4.54609 litre

(l)

(*) En las recetas de cocina, una taza (a cup) de ingredientes, como harina o azúcar, equivale a 0,275 litros. 

Examples:
I asked the milkman to leave three pints of milk.
The petrol tank holds 40 litres.