Square roots·√155
√155 =
√155
≈ 12.4499

Square root of 155 — 12.4499 (√155)

Irrational

The square root of 155 is about 12.4499, or exactly √155. It lies between 12 and 13.

As a decimal
≈ 12.4499
Simplified surd
√155 = √155
Between
12 < √155 < 13
Squared
155² = 24025
Cube root
∛155 ≈ 5.371685

Nearby numbers

√152 = 2√38√153 = 3√17√154 = √154√156 = 2√39√157 = √157√158 = √158

From 1 to 200

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200

How to read this

  • The decimal is rounded; the surd form is the exact value.
  • Pulling out a square factor simplifies the surd — √50 = 5√2.
  • If the number is not a perfect square, the decimal never ends (irrational).
  • Knowing which two integers it sits between is enough to estimate in your head.

Frequently asked questions

Q. What is the square root of 155?

About 12.4499, or exactly √155.

Q. Can the surd be simplified?

No — there is no square factor to pull out.

Q. Between which integers does it fall?

Between 12 and 13.

Q. What is the cube root of 155?

About 5.371685.