Anyone Good at Maths?
Secteur
Posts: 1,971
I am really, really bad with numbers (dyscalculia, actually!), so could someone help me.
What formula should I use to calculate an "average percentage grade" across my whole ride;
for example if I rode 50 miles and my garmin tells me I had 1200 metres of climbing (vertical ascent), what would that work out to if it were a linear slope the whole way?
Thanks :)
What formula should I use to calculate an "average percentage grade" across my whole ride;
for example if I rode 50 miles and my garmin tells me I had 1200 metres of climbing (vertical ascent), what would that work out to if it were a linear slope the whole way?
Thanks :)
0
Comments

1.5% so flatish0

As Einstein proved, measurements of various quantities are relative to the velocities of observers. As such, what was your average speed?0

50 miles is about 80km, or 80000 meters. You went up 1200m.
So 1200m of up in 80000 meters is 1200 ÷ 80000 * 100 = 1.5%
Or 1 in 66 in old money.0 
That's great, thanks!0

Noone on here it would seem. You need to remember to subtract the number of metres of descending.
Top Tip  if you start and finish in the same place, the answer is always 0%.0 
^^^this
in which case you can calculate the average gradient climbing as...
total height gained
divided by
half the total distance
for the example you give, that'll be...
1200 / 40000 (40000 m is about 25 miles)
which is 0.03
multiply by 100 to turn it into %, and you have 3%my bike  faster than god's and twice as shiny0 
Pedantically, he never said he did any descending or did a loop.0

TheEnglishman wrote:Pedantically, he never said he did any descending or did a loop.
Pedantically:
1. if he does no descending then he can subtract zero and it'll still work just fine.
2. Noone said he did a loop. The key word here is "if".
3. Why do you assume the OP is a "he"?0 
Oi! settle down at the back!
Thanks for the help.
And just for completeness, I am a he (the last time I checked, anyway), and it is a loop that I tend to ride.0 
P_Tucker wrote:Noone on here it would seem. You need to remember to subtract the number of metres of descending.
Top Tip  if you start and finish in the same place, the answer is always 0%.
You need to read the OP, he asked as if it were a linear slope the whole way! thats the answer he got, so you accuse others of not being good at maths guess English isnt your forte!0 
BruceG wrote:P_Tucker wrote:Noone on here it would seem. You need to remember to subtract the number of metres of descending.
Top Tip  if you start and finish in the same place, the answer is always 0%.
You need to read the OP, he asked as if it were a linear slope the whole way! thats the answer he got, so you accuse others of not being good at maths guess English isnt your forte!
I think what's happened here is that you've brainfarted.0 
P_Tucker wrote:BruceG wrote:P_Tucker wrote:Noone on here it would seem. You need to remember to subtract the number of metres of descending.
B
Top Tip  if you start and finish in the same place, the answer is always 0%.
You need to read the OP, he asked as if it were a linear slope the whole way! thats the answer he got, so you accuse others of not being good at maths guess English isnt your forte!
I think what's happened here is that you've brainfarted.
Strange way of saying you wrong, but i guess further evidence of your lacking english skills0 
BruceG wrote:P_Tucker wrote:BruceG wrote:P_Tucker wrote:Noone on here it would seem. You need to remember to subtract the number of metres of descending.
B
Top Tip  if you start and finish in the same place, the answer is always 0%.
You need to read the OP, he asked as if it were a linear slope the whole way! thats the answer he got, so you accuse others of not being good at maths guess English isnt your forte!
I think what's happened here is that you've brainfarted.
Strange way of saying you wrong, but i guess further evidence of your lacking english skills
FFS. Right, lets help you out, as you appear to be struggling with both maths and English. If the OP did a ride which involved say 1000m of climbing and 900m of descending over 100km, then he will finish 100m higher than he started. With me so far? Now, as you point out, the OP requested a "linear slope the whole way". The whole way is 100km. He finished 100m higher than he started. If it helps, try to imagine drawing a straight line between the two. So we have 100 / 100000 * 100% = 0.1%.
As it happens, sungod gave the best answer. The OP simply asked the wrong question.
Another top tip  if you are going to mock someone for being wrong, try to make sure you're right.0 
P_Tucker wrote:BruceG wrote:P_Tucker wrote:BruceG wrote:P_Tucker wrote:Noone on here it would seem. You need to remember to subtract the number of metres of descending.
B
Top Tip  if you start and finish in the same place, the answer is always 0%.
You need to read the OP, he asked as if it were a linear slope the whole way! thats the answer he got, so you accuse others of not being good at maths guess English isnt your forte!
I think what's happened here is that you've brainfarted.
Strange way of saying you wrong, but i guess further evidence of your lacking english skills
FFS. Right, lets help you out, as you appear to be struggling with both maths and English. If the OP did a ride which involved say 1000m of climbing and 900m of descending over 100km, then he will finish 100m higher than he started. With me so far? Now, as you point out, the OP requested a "linear slope the whole way". The whole way is 100km. He finished 100m higher than he started. If it helps, try to imagine drawing a straight line between the two. So we have 100 / 100000 * 100% = 0.1%.
As it happens, sungod gave the best answer. The OP simply asked the wrong question.
Another top tip  if you are going to mock someone for being wrong, try to make sure you're right.
Excatly right HE ASKED THE WRONG question, go back and read what he asked the answer he got from me and the others was correct for the question he asked FFS as you crudely put it, so to use your own advice dont mock others when you are WRONG
PS I hear McDonalds are looking for a stand suit you down to the ground CLOWN0 
This is getting good... Maths with a capital M or not? As a Maths teacher I think it should even if grammatically its incorrect.0

BruceG wrote:Excatly right HE ASKED THE WRONG question, go back and read what he asked the answer he got from me and the others was correct for the question he asked FFS as you crudely put it, so to use your own advice dont mock others when you are WRONG
PS I hear McDonalds are looking for a stand suit you down to the ground CLOWN
Since the OP didn't state the amount of descending he did on his hypothetical ride, the correct answer is "it depends on the amount of descending you did". Not doing a sum with incomplete information.
You really are humiliating yourself, do try to stop.0 
Ok, please stop everyone!
I probably wasn't too clear with my question  I was meaning what would the average grade of just the ascent be (discounting the descents) over the distance.
I understand the maths better now, so I can do my calculations from here.
Thanks again everyone (and please stop squabbling  I don't like it!)0 
Secteur wrote:Ok, please stop everyone!
I probably wasn't too clear with my question  I was meaning what would the average grade of just the ascent be (discounting the descents) over the distance.
I understand the maths better now, so I can do my calculations from here.
Thanks again everyone (and please stop squabbling  I don't like it!)
Just be thankful they're not questioning your manhood
0 
TheEnglishman wrote:
Just be thankful they're not questioning your manhood
Now that's a completely different mathematical formulae which centres upon the angle of dangle rather than the incline of the pass.0 
NO has to be the emphatic answer im my case.......
I have a triangle of ground, no great size about 1.5 metres equilateral that I want to pave with bricks.
So worked out the area (height*base)/2. I honestly can't remember the result, measured a brick did the maths divided one in to the other. Went and picked up 30 bricks because that was the answer I arrived at .
Heavens knows where I went wrong I appear to have twice as many bricks as I need.....I haven't got round to laying them yet, so might be getting the wrong impression.
DShould have learnt by now.... Always measure twice!0