Use the form below to do your conversion.
Solution
Step1
Log21871=Log(871) ÷ Log(21)
Log(871)= 2.9400181550077
Log(21)=1.3222192947339
Log21871=2.9400181550077 ÷ 1.3222192947339
Ans=2.2235480655267
Step2
Alternatively, the logarithm can be calculated like this.