Apple's iPhone 4 costs the company just $171 (£115) to build giving the new device a profit margin of more than 61%, according to the Wall Street Journal.

Materials and parts for the 16GB iPhone 4 total $171, said Brian Marshall of US analyst BroadPoint AmTech, while non-hardware costs such as licensing fees and set-asides for warranty claims add another $35, bringing Apple's total cost to $208. The 32GB iPhone 4, meanwhile, has a cost of materials price tag of $195, and a total cost including non-hardware fees of $230.

"The 16GB iPhone 3GS had a BOM [bill of materials] of $185 last summer, so the cost came down a little," said Marshall. "Apple is being very aggressive on its suppliers to lower BOM."

Assuming Apple receives $529 for each 16GB iPhone 4 and $629 for each 32GB model - based on the price in the US, which includes the subsidies that mobile carriers pay Apple - the lower-priced iPhone 4 boasts a gross margin of 61% while the 32GB device sports a gross margin of 70%.

Apple sells the 16GB iPhone 4 for $199, and the 32GB model for $299. It does not, however, disclose payments it gets from US operator AT&T or other carriers, leaving analysts like Marshall to guess at the total dollar amount it receives for each iPhone.

"The margins will actually uptick once the iPhone 4 ramps to volume production," Marshall said.

Marshall's analysis includes components and the direct non-hardware costs, but doesn't take into account research and development, marketing or labor costs. His estimate does include manufacturing and packaging costs, however.

The single most-expensive part of the iPhone 4 is the revamped display, which Marshall estimated at $25, one dollar more than the estimated $24 Apple pays Samsung, Toshiba and others for 16GB of flash memory. LG Display is the most likely supplier of the screen, which for the first time is a sealed unit that includes not only the display but also the touchscreen component.

The 32GB of memory in the more spacious iPhone 4 sets Apple back $48.

Apple CEO Steve Jobs touted the iPhone 4's screen - dubbing it the Retina Display - when he unveiled the new model three weeks ago. According to Apple, the iPhone 4's 3-inch-by-4-inch display packs four times the number of pixels as the iPhone 3GS's screen.

According to Marshall, the A4 application processor, a system-on-a-chip designed by Apple but made by Samsung, costs approximately $10, while the camera module - which powers both the 5-megapixel camera on the back and new 1.3-megapixel front-facing camera - also costs $10.

iSuppli estimated the A4's cost at a slightly-higher $10.75.

Apple has trimmed its iPhone costs by 29% since it introduced the smartphone in 2007. That year, iSuppli estimated the BOM of the 8GB first-generation iPhone at $263.83, giving Apple a profit margin of nearly 56%.

Marshall said he expects that the more expensive 32GB iPhone 4 will account for 70% of Apple's unit sales of the new model.

See also:

iPhone 4 review

Apple iPhone news