It's about as big as a King Size Bed
It's about one-fourth as big as a Parking Space
In other words, 0.00403 dunams is 0.2690 times the size of a Parking Space, and the size of a Parking Space is 3.720 times that amount.(a.k.a Parking Stall) (average; surface lot; North America)
An average-size parking space in a North American surface lot measures 0.015 dunams. Due to the high real estate prices at the time, parking spaces in a densely-populated part of Manhattan would sell for an average of $165,000 in 2007, with some spaces fetching up to $225,000.
It's about three-and-a-half times as big as a Bath Towel
In other words, 0.00403 dunams is 3.71840 times the size of a Bath Towel, and the size of a Bath Towel is 0.268930 times that amount.(for Fieldcrest Luxury Solid Towels)
Bath towels typically measure 142.24 cm (56 in) by 76.2 cm (30 in), for a total area of about 0.0010838 dunams. The city of Bursa, Turkey is known as the birthplace of the modern towel.
It's about forty times as big as an Airplane Tray Table
In other words, 0.00403 dunams is 39.90 times the size of an Airplane Tray Table, and the size of an Airplane Tray Table is 0.0251 times that amount.(average)
With wide variation among different models of airplanes, in-flight tray tables measure around 41.2 cm (16.5 in) x 24.1 cm (9.5 in) for a total area of 0.000101 dunams. Flight safety rules require that the tray tables be upright and locked during takeoff and landing so as to reduce the risk of passenger abdominal injury.
It's about one-sixty-fifth as big as a Tennis court
In other words, 0.00403 dunams is 0.015448205 times the size of a Tennis court, and the size of a Tennis court is 64.732440 times that amount.(per ITF specification; for doubles)
Per International Tennis Federation Rules of Tennis 2009, a doubles tennis court should measure 23.7744 m long by 10.9728 m, for a total area of about 0.260760 dunams. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.
It's about one-ninetieth as big as an IMAX screen
In other words, 0.00403 dunams is 0.01138 times the size of an IMAX screen, and the size of an IMAX screen is 87.870 times that amount.(standard)
An IMAX movie theater screen measures 22 m (72 ft) by 16 m (52 ft) for a total area of 0.35420 dunams. Because the film used in an IMAX movie is more than eight times larger than regular film, the platters of a two-and-a-half hour feature film can weigh up to 250 kg (550 lbs).
It's about 100 times as big as an Apple iPad
In other words, 0.00403 dunams is 100.70 times the size of an Apple iPad, and the size of an Apple iPad is 0.00993 times that amount.(for 9.7 inch, Apple iPad Air MD785LL/B)
An Apple iPad measures 23 cm (9.4 in) x 17 cm (6.6 in) for a total device area of 0.000040020 dunams. The base model iPad Air features 16 GB of storage capacity.