Data Handling
Conversion Graphs
We use a conversion graph when two units
have a linear relationship
Metric weight in grams has a linear
relationship with imperial weight in ounces:
25g = 1oz
50g = 2oz
400g = ?
Data Handling
Conversion Graphs
Both grams and ounces can be plotted on a
graph to show a diagonal line where they are
equivalent. This graph can then be used to
determine how many ounces there are in
grams or how many grams there are in
ounces.
Data Handling
Conversion Graphs
grams
Work out
what will go
on each axis.
Decide on the
division of
units
ounces
Data Handling
Conversion Graphs
grams
Work out a
suitable
scale for
each axis
275
250
225
200
175
150
125
100
Plot the
equivalent
values and join
up with a
straight line
75
50
25
1
2
3
4
5
6
7
8
9
10 11 12
ounces
Data Handling
Conversion Graphs
grams
Once the
diagonal line
is plotted
you can
convert
grams to
ounces…
…and
ounces to
grams
275
250
225
200
175
150
125
100
75
50
25
1
2
3
4
5
6
7
8
9
10 11 12
ounces
Data Handling
Conversion Graphs
275
For values
larger than the
scale you can
multiply up for
example:
16oz. =
10oz. + 6oz.
This is
250g + 150g =
400g
250
225
grams
200
175
150
125
100
75
Or 2 x 8oz
50
25
1
2
3
4
5
6
7
8
9
10 11 12
ounces