Hill conversion

Garry Jones said:

I want a chart that explains and converts hills in different
"languages".

ie,

1 in 3
33%
18,43°

Can anyone clarify an easy system for calculating these three different
systems if no website/java script already exists....

To convert from a fraction to a percent grade, divide: 1/3 = .33
= 33%.

To convert from a decimal fraction to an angle in degrees, take
the inverse tangent ("arctangent"😉: atan(.33) = 18.43 degrees.
If your calculator displayed 0.3218 instead, then you're in
radians mode; either set your display for degrees mode or
multiply the result by 180/pi (about 57.32).
--
Ben Pfaff
email: [email hidden]
web: http://benpfaff.org

Ben Pfaff said:

To convert from a fraction to a percent grade, divide: 1/3 = .33
= 33%.

To convert from a decimal fraction to an angle in degrees, take
the inverse tangent ("arctangent"😉: atan(.33) = 18.43 degrees.

Yep, I got that after a little work in Excel. The thing is that working
out your own forumlas for these things is usually unnecessary because
someone else has more than likely already uploaded a java script
somewhere...

Some time a go I worked out a conversion chart for gears to gear inches
and gear metres based on tyre size and number of sprockets. It took some
tweaking and just before I finished it someone pointed me to a working
java script on a website which was even better than the one I was
working on.

In this case for hills I used Excel and...

ARCTAN(1/x)*180/PI()

(Where x is value in the "one in x" phrase).

So a one in ten is 5.71°

Thanks for your feedback. I still think it is strange that I could not
find any websites explaining the different hill measurments used.

Garry J

"Garry Jones" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Anyway have a link to a conversion website.

I want a chart that explains and converts hills in different
"languages".

ie,

1 in 3
33%
18,43°

Can anyone clarify an easy system for calculating these three different
systems if no website/java script already exists....

Garry Jones
English Cyclist ResIDING in Sweden

I've recently added a "Grade Calculator" to my CycliStats ride log and
training diary program ( http://www.CycliStats.com ). You can see a picture
of it on this page: http://www.shastasoftware.com/CycliStats/tools.htm .

It currently only calculates grade in percentage, because that seems to be
(by far) the most common way of describing grade. I could enhance this
feature with degrees, or "1 in x", but are these alternative grade
descriptions at all common? All I've ever seen in my travels is grade
stated in percentage terms, but perhaps those alternative descriptions are
used in some places.

~_-*
....G/ \G
http://www.CycliStats.com
CycliStats - Software for Cyclists

On Thu, 19 Aug 2004 10:16:26 -0700, "GaryG"

garyg@shasta_SPAMBEGONE_software.com said:

I've recently added a "Grade Calculator" to my CycliStats ride log and
training diary program ( http://www.CycliStats.com ). You can see a picture
of it on this page: http://www.shastasoftware.com/CycliStats/tools.htm .

Can those who have an expired prev. version dl this and look at this new
feature?

-B

"Badger_South" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

On Thu, 19 Aug 2004 10:16:26 -0700, "GaryG"

garyg@shasta_SPAMBEGONE_software.com said:

I've recently added a "Grade Calculator" to my CycliStats ride log and
training diary program ( http://www.CycliStats.com ). You can see a

picture

Quoted message said:

Quoted message said:

of it on this page: http://www.shastasoftware.com/CycliStats/tools.htm .

Can those who have an expired prev. version dl this and look at this new
feature?

Yes - if you have any version prior to 3.0, you can download the current
version and get another 30-day trial period.

If you have an expired version of 3.0 or higher, the Grade Calculator tool
will work on an irregular basis (every other day).

BTW - if anyone has suggestions for enhancements or new features, please
send them along to CycliStatsSupport(at)shastasoftware(dot)com.

--
~_-*
....G/ \G
http://www.CycliStats.com
CycliStats - Software for Cyclists

GaryG garyg@shasta_SPAMBEGONE_software.com said:

It currently only calculates grade in percentage, because that seems to be
(by far) the most common way of describing grade. I could enhance this
feature with degrees, or "1 in x", but are these alternative grade
descriptions at all common? All I've ever seen in my travels is grade
stated in percentage terms, but perhaps those alternative descriptions are
used in some places.

In Hong Kong steep hills have signs which indicate grades as, for example,
"1:6" or "1:8" placed on top of a picture of a right-angled triangle. They
probably acquired this habit from the UK, where I recall seeing signs in
this form as well, so I wouldn't be surprised if this was common at least
in countries where the UK once had influence.

When I was in engineering school, long ago, we used to refer to the
slopes of things like tunnels and shafts in mines, which could be steep,
in degrees. I think this avoided the small awkwardness of talking
about near-vertical slopes as a percentage approaching infinity.

Dennis Ferguson

"Dennis Ferguson" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

GaryG garyg@shasta_SPAMBEGONE_software.com said:

It currently only calculates grade in percentage, because that seems to

be

Quoted message said:

Quoted message said:

(by far) the most common way of describing grade. I could enhance this
feature with degrees, or "1 in x", but are these alternative grade
descriptions at all common? All I've ever seen in my travels is grade
stated in percentage terms, but perhaps those alternative descriptions

are

Quoted message said:

Quoted message said:

used in some places.

In Hong Kong steep hills have signs which indicate grades as, for example,
"1:6" or "1:8" placed on top of a picture of a right-angled triangle.

They

Quoted message said:

probably acquired this habit from the UK, where I recall seeing signs in
this form as well, so I wouldn't be surprised if this was common at least
in countries where the UK once had influence.

When I was in engineering school, long ago, we used to refer to the
slopes of things like tunnels and shafts in mines, which could be steep,
in degrees. I think this avoided the small awkwardness of talking
about near-vertical slopes as a percentage approaching infinity.

Dennis Ferguson

Interesting...thanks. As time permits, I'll add that (and degrees) to the
Grade Calculator in CycliStats.

--
~_-*
....G/ \G
http://www.CycliStats.com
CycliStats - Software for Cyclists

"Dennis Ferguson" <[email hidden]> wrote in message
news:[email hidden]...

[snip]

Quoted message said:

In Hong Kong steep hills have signs which indicate grades as, for

example,

Quoted message said:

"1:6" or "1:8" placed on top of a picture of a right-angled

triangle. They

Quoted message said:

probably acquired this habit from the UK,

[snip]

Here in the UK there are some gradients given in %, but most of them
are still in the form 1 in something. They seem to calculate only to
the nearest whole number, 1:4, 1:3 etc and the % signs are obviously
straight conversions of the old system, so a sign will be 25% or 33%,
never, apparently, anything in between. Some roads can get pretty
steep, being originally graded for trains of pack horses, but 33% is,
I think the limit.

Jeremy Parker