Hick's Law
The time it takes to make a decision increases logarithmically with the number and complexity of choices available.
Hick's Law (also Hick-Hyman Law) quantifies what choice overload describes qualitatively: every additional option increases decision time. Formulated in 1952, it states that reaction time increases logarithmically — not linearly — with the number of choices.
The Formula and What It Means
T = b × log2(n + 1), where T is decision time, b is a constant, and n is the number of choices. The logarithmic relationship means that going from 2 to 4 options adds more time than going from 20 to 22.
Application in Digital Design
Hick's Law is the quantitative justification for simplifying navigation, reducing form fields, and limiting pricing tiers. Every additional option you add to a page measurably increases the time to decision — and in digital contexts, more time usually means more abandonment.
The Practical Implication
Hick's Law doesn't mean "fewer options is always better." It means that each additional option must earn its place by providing enough value to offset the increased decision time. If a fourth pricing tier captures a meaningfully different customer segment, it's worth the cognitive cost. If it's just padding, remove it.
Testing with Hick's Law
When testing page simplification, track both conversion rate and time-to-conversion. If simplification increases conversion but also reduces time-on-page, that's a strong signal that you've reduced cognitive friction — users are deciding faster and converting more.