Specific numbers beat round numbers

"Over 10,000 customers" sounds like marketing. "12,847 customers" sounds like someone checked a database. The specificity implies precision, and precision implies truth.

This works everywhere numbers appear. "Save 37% on average" is more believable than "Save up to 40%." "Delivers in 2.3 days on average" beats "Delivers in 2-3 days." The specific number feels measured. The round number feels estimated.

There's research behind this. Studies on negotiation show that specific numbers anchor more effectively than round numbers. A candidate who asks for $87,500 gets a different response than one who asks for $90,000. The specific number suggests the person calculated their worth. The round number suggests they picked a number.

The rule is simple: if you have real data, show the real number. Don't round 12,847 to "over 10,000" to make it seem bigger. The precision of the smaller number is more persuasive than the size of the rounded one.