Use the form below to do your conversion.
Solution
Step1
Log21257=Log(257) ÷ Log(21)
Log(257)= 2.4099331233313
Log(21)=1.3222192947339
Log21257=2.4099331233313 ÷ 1.3222192947339
Ans=1.8226425320894
Step2
Alternatively, the logarithm can be calculated like this.