- 1/1: A penny saved is a penny earned
- 1/2: A bird in the hand is worth 2 in the bush
- 1/9: A stitch in time saves nine
- 1/16: An ounce of prevention is worth a pound of cure
- 1/240: In for a penny, in for a pound (thanks @vogon for pointing out this would have been coined1 pre-decimalization)
- 1/1000: A picture is worth 1000 words (thanks @NireBryce)
- 1/63360: Give them an inch, they take a mile (thanks @RoyalAssassin)
- 1/1000000: One in a million (thanks @jay)
Can we go higher?
In looking up "in for a penny, in for a pound", I saw there's a variant "in for an inch, in for a mile" which would get us to 1/63360 but I've also never actually heard it said
further edit: probably need to exclude obviously-large but not fixed/specified quantities as several people have pointed out good ones in the comments
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yes