It's about as big as a King Size Bed
It's about one-fourth as big as a Parking Space
In other words, 0.000403 hectares is 0.269 times the size of a Parking Space, and the size of a Parking Space is 3.72 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 0.0015 hectares. 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, 0.000403 hectares is 3.7184 times the size of a Bath Towel, and the size of a Bath Towel is 0.26893 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 0.00010838 hectares. 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, 0.000403 hectares is 39.9 times the size of an Airplane Tray Table, and the size of an Airplane Tray Table is 0.025 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 0.00001010 hectares. 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, 0.000403 hectares is 0.01544821 times the size of a Tennis court, and the size of a Tennis court is 64.73244 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 0.026076 hectares. 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, 0.000403 hectares is 0.0114 times the size of an IMAX screen, and the size of an IMAX screen is 87.87 times that amount.(standard)
An IMAX movie theater screen measures 22 m (72 ft) by 16 m (52 ft) for a total area of 0.03542 hectares. 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, 0.000403 hectares is 100.7 times the size of an Apple iPad, and the size of an Apple iPad is 0.0099 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 0.0000040020 hectares. The base model iPad Air features 16 GB of storage capacity.