Template:Worldpop

8140420000

 {{ #expr: {{worldpop-base}} + {{worldpop-daily-inc}} * {{Age in days|2012|7|1}} round -2 }}

Automatically updates ONCE per day at 00:00 UTC (possibly offset during daylight savings)
Formatted to nearest 100 to reduce likelihood of display in scientific notation, and also to avoid false precision

Regarding rounding

if rounded to nearest 100-thousand, will often display in scientific notation
if round ends in 5 zeroes, there is an intermittent sci notation problem
This CAN happen even if the number is rounded to 0 places - IF the number ends in 5 zeroes
results are inconsistent, seemingly dependent on which server renders the numbers

Places rounded to	result	"textified"	with commas
none	8,912,390,606.4
0	8,912,390,606
1	8,912,390,610	8912390610	8,912,390,610
2	8,912,390,600	8912390600	8,912,390,600
3	8,912,391,000	8912391000	8,912,391,000
4	8,912,390,000	8912390000	8,912,390,000
5	8,912,400,000	8912400000	8,912,400,000	at 192,214.4 more per day, this value will change daily
6	8,912,000,000	8912000000	8,912,000,000
7	8,910,000,000	8910000000	8,910,000,000
8	8,900,000,000	8900000000	8,900,000,000
9	9,000,000,000	9000000000	9,000,000,000

date	population estimate	change	# days	#/day
2012-07-01	7,017,543,964
2012-08-01	7,024,140,935	6,596,971	31	212,805.516
2012-09-01	7,030,737,906	6,596,971	31	212,805.516
2012-10-01	7,037,122,072	6,384,166	30	212,805.533
2012-11-01	7,043,719,043	6,596,971	31	212,805.516
2012-12-01	7,050,103,209	6,384,166	30	212,805.533
2013-01-01	7,056,700,180	6,596,971	31	212,805.516
2013-02-01	7,063,297,151	6,596,971	31	212,805.516
2013-03-01	7,069,255,706	5,958,555	28	212,805.535
2013-04-01	7,075,852,677	6,596,971	31	212,805.516
2013-05-01	7,082,236,843	6,384,166	30	212,805.533
2013-06-01	7,088,833,814	6,596,971	31	212,805.516
2013-07-01	7,095,217,980	6,384,166	30	212,805.533
YEAR		77,674,016	365	212,805.523

Source: http://www.census.gov/population/popclockworld.html
- 8,045,311,448 is the US Census estimate for 2012-07-01 (2012 July)
- 192,214.4 per day is both the average for the year & the nearly-equivalent daily value within every month
- Above figures are sometimes changed by that site - even retroactively. Last check for revisions on that site was 2013-APR-15.

According to http://www.census.gov/population/international/data/idb/worldvitalevents.php, each day an average 367,472 babies are born, and 153,652 people die, for a net gain per day of 213,820 - these figures are a bit more than the above figure of 192,214.4.
At http://www.census.gov/population/international/data/idb/worldpoptotal.php are mid-year figures for every year from 1950-2050.