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55.3x1.2 + 280 (4:40 or 4:58 mile)x.216 = 126.56 or 2:06.56. i ran 2:07.4 last year so yeah this is accurate. also only ran the mile twice in my life (not counting middle school). awesome!
4:00 (converted from 4:19 mile), 2:00, 53.5, 24.3
(53.5*1.2) + (4:00*.216)= 116.04 = 1:56.04
I just can't figure my shit out in the 800 I guess.
Looks good. Used 0.2155 instead.
How do I move the numbers around to predict my 15 time off 400 and 800?
Oh I'll just run my numbers, hang on.
58,6
4.13,7
It gives me 2.04,8
My pb is 2.04,7 (using the 0,215)
Very very good
So back to the original question:
We have
800 = (400x1,2)+(1500x0,215)
Will that be summat like, if the 1500 is the unknown:
-1500x0,215= (400x1,2)-800
Divide by -0,215 on both sides
So we have (I've now entered my known numbers to see if it gets me anywhere near the correct answer)
1500 = ((58,6x1,2)/-0,215) - (124,7/-0,215)
1500 = -327,07 - (-580)
1500 = 252,93
1500 = 4.12,93
Yes!! I think I did it! Fkin yes!!
So that's a decent 1500 calculator too and like someone else said it's probably more often that someone's ran a 4 and 8 and would like a 15 predictor rather than having ran 4 and 15, and not the 8. Anyway, cool stuff!
Yes it can be rearranged quite simply to predict the 1500m:
(800m - 400m x 1.2)/0.216 = 1500m
That thing is freaking awesome. Spot on for me. Thanks. I'll use this in the future to see what I can run when I PB in an event.
No problem, glad it works for you. I think for most people 0.216 gives the most accurate predictions.
Better calculator here: http://www.letsrun.com/forum/flat_read.php?thread=4286187
I got 2:04.605 but my PR is 2:14
denzel_vilsaint wrote:
I got 2:04.605 but my PR is 2:14
What are your PBs?
400m best= 58 x 1.2= 69.6
1500m best (from mile)= 4:21.59= 261.59 x .216= 56.5
or
261.59 x .215= 56.24
using .215= 2:05.84
using .216= 2:06.1
Actual PR= 2:09.XX
My senior year of college I ran:
49.5
1:49.7
3:52.4
The first calculator predicted my 800 to be 1:49.6
Pretty good
Calculator wrote:
Help me decide which is the better model:
400m best x 1.2 + 1500m best x 0.216
or
400m best x 1.2 + 1500m best x 0.215
Post your results!
This isn't realistic for true 400/1500 athletes. Think Michael Johnson/Kirani James running 1500's. Ummm, no. Think Leo Manzano/Centro running 400's...maybe in practice but not elite level. They can't run 44 or 45's.
I disagree with this wrote:
Calculator wrote:Help me decide which is the better model:
400m best x 1.2 + 1500m best x 0.216
or
400m best x 1.2 + 1500m best x 0.215
Post your results!
This isn't realistic for true 400/1500 athletes. Think Michael Johnson/Kirani James running 1500's. Ummm, no. Think Leo Manzano/Centro running 400's...maybe in practice but not elite level. They can't run 44 or 45's.
What you've just said doesn't really make any sense. The calculator is supposed to predict your personal 800m ability based on your 400 and 1500m ability. You don't have to run 44 or 45 seconds in the 400m for it to work.
Try it with your PBs
Interestingly, for Ashton Eaton:
45.00 and 4:15 give:
1:49.0
Calculator wrote:
Yes it can be rearranged quite simply to predict the 1500m:
(800m - 400m x 1.2)/0.216 = 1500m
Don't you agree it's easier to do it my way
Better than Ventolin's calc. Nice work.
if you put in Donovan braziers 45.9 400m (relay, i'm going to put it at 46.2 for the calculator) and his 4:07 mile converted to 1500m (3:49.6) you get
46.2 (1.2) = 55.44
3:49.6 x .216 = 49.59 = 1:45.03
fefe wrote:
if you put in Donovan braziers 45.9 400m (relay, i'm going to put it at 46.2 for the calculator) and his 4:07 mile converted to 1500m (3:49.6) you get
46.2 (1.2) = 55.44
3:49.6 x .216 = 49.59 = 1:45.03
That looks about right. He probably is capable of sub 1:45 this summer should everything go well.