The Blood Donation Time Calculator is used for you to calculate the next time you can donate blood, based on the last time you donated. Donating blood is a noble act and should be taken seriously, if you donate too much blood you will put yourself at risk. Use the above calculator to calculate the next time you can donate blood.
According to the American Red Cross, you can donate blood every 56 days. The intervals between Power Red donations is 16 weeks.