The reason I'm asking is I'm trying to do some of the math behind the payload that is in accordance with what was dropped. Checking wikipedia it's stated that it was about 100 tonnes.
Using google I get the conversion of 100000 kilos = 220462 lbs. This means that roughly 5 B-2 bombers with full payload (2 internal bays for 50,000 lb (23,000 kg) of ordnance and payload) have the ability to cause the same damage that was done in roughly 8 months (September 1940 and 21 May 1941).
I'm a little confused; are you asking about the accuracy of German bombing, or the total weight of bombs dropped? If the latter, I'm not sure where you get the figure of 100 tons from, the only reference I can find on the wikipedia article on the Blitz is where that's used as the threshold for what constitutes a major raid. Later on it states "The military effectiveness of bombing varied. The Luftwaffe dropped around 45,000 short tons (41,000 t) of bombs during the Blitz" (no specific citation). There's also a table of raids by city, from The Night Blitz by John Ray, with tonnage of HE dropped in major raids totalling 30,101 t.
An article in The Independent, referring I believe to the whole war rather than just The Blitz, has "The Luftwaffe's total of 74,000 tons of bombs dropped on Britain was utterly eclipsed by the nearly two million tons dropped by RAF Bomber Command and the US 8th Air Force by the end of the war in 1945."
German medium bombers (the Do 17, Ju 88 and He 111) typically carried 1 - 2,000kg bomb loads, and the Luftwaffe attacked with over 400 aircraft on seven occasions (Terraine, The Right of the Line), the largest force being 712 bombers, so even if you have a modern aircraft with twenty times the payload you'd need 36 of them to replicate that single day (in terms of raw weight).