Taken from http://typecast.com/blog/a-more-modern-scale-for-web-typography.

modern-measured-scale.md

Body

Medium	Font Size	Line Height	Characters
Print	12pt	1.25em	60-75
Desktop (lg)	1em (16px)	1.375em	60-75
Desktop	1em (16px)	1.375em	60-75
Tablet (lg)	1em (16px)	1.375em	60-75
Tablet (sm)	1em (16px)	1.25em	60-75
Phone	1em (16px)	1.25em	35-40

H1

Medium	Font Size	Line Height	Characters
Print	36pt	1.25em	60-75
Desktop (lg)	3em (48px)	1.05em	60-75
Desktop	3em (48px)	1.05em	60-75
Tablet (lg)	2.5em (40px)	1.125em	60-75
Tablet (sm)	2em (32px)	1.25em	60-75
Phone	2em (32px)	1.25em	35-40

H2

Medium	Font Size	Line Height	Characters
Print	24pt	1.25em	60-75
Desktop (lg)	2.25em (36px)	1.25em	60-75
Desktop	2.25em (36px)	1.25em	60-75
Tablet (lg)	2em (32px)	1.25em	60-75
Tablet (sm)	1.625em (26px)	1.15384615em	60-75
Phone	1.625em (26px)	1.15384615em	35-40

H3

Medium	Font Size	Line Height	Characters
Print	18pt	1.25em	60-75
Desktop (lg)	1.75em (28px)	1.25em	60-75
Desktop	1.75em (28px)	1.25em	60-75
Tablet (lg)	1.5em (24px)	1.25em	60-75
Tablet (sm)	1.375em (22px)	1.13636364em	60-75
Phone	1.375em (22px)	1.13636364em	35-40

H4

Medium	Font Size	Line Height	Characters
Print	14pt	1.25em	60-75
Desktop (lg)	1em (16px)	1.22222222em	60-75
Desktop	1em (16px)	1.22222222em	60-75
Tablet (lg)	1em (16px)	1.22222222em	60-75
Tablet (sm)	1em (16px)	1.11111111em	60-75
Phone	1em (16px)	1.11111111em	35-40

Blockquote

Medium	Font Size	Line Height	Characters
Print	24pt	1.45833333em	60-75
Desktop (lg)	1.5em (24px)	1.45833333em	60-75
Desktop	1.5em (24px)	1.45833333em	60-75
Tablet (lg)	1.5em (24px)	1.45833333em	60-75
Tablet (sm)	1.25em (20px)	1.25em	60-75
Phone	1.25em (20px)	1.25em	35-40