Omni Calculator logo

Blood Donation Due Date Calculator

Created by Mehjabin Abdurrazaque
Reviewed by Wojciech Sas, PhD and Rijk de Wet
Last updated: Jan 18, 2024

If you are looking for a blood donation due-date calculator to know when you can donate blood again, good news! We have prepared a calculator like that to help you. The blood donation due date calculator gathers information about only your last blood donation date and your gender, and then gives you the date that you can donate blood again.

In this article, you will find answers to questions like:

  • How to calculate the blood donation due date?
  • Who can donate blood?
  • What excludes a person from donating blood?
  • The volume of blood donated in one donation...

... and more!

Do you want to check the compatibility for donating and receiving blood or blood plasma? Have a look at our blood donor calculator!

✅ Have you imagined what would happen if people like you stopped donating blood? One donation can save the lives of up to three people. If you donate every 4 months, i.e., 3 times a year, you save 9 people a year! Thank you for donating blood. We’re happy to be a part of your blood donation journey that saves lives and makes this world a better one!

Who can donate blood?

To donate blood, you need to meet some basic health conditions set by the World Health Organization (WHO):

  1. You must be within 18 to 65 years of age. In some countries, the maximum age is 60.
  2. Your hemoglobin count must be more than 12.0 g/dL (for females) or 13.0 g/dL (for males).
  3. You must weigh more than 50 kg (110 lbs). Some countries allow you to donate blood if you weigh more than 45 kg (99 lbs).
  4. Your resting heart rate must be between 50 and 100 bpm with no irregularities.
  5. Your body temperature must be normal and your oral temperature may not be more than 37.5 degrees Celsius at the time of donation.
  6. Your systolic blood pressure must be between 100 and 180 mmHg and your diastolic blood pressure between 50 and 100 mmHg.
  7. You don't have any disease that can spread through blood transfusion.
  8. You don't have a fever or flu at the time of donation.
  9. You're not pregnant.

How do I calculate the blood donation due date?

Male donors can give blood every 12 weeks (about 3 months) and female donors can donate blood every 16 weeks (about 4 months). So, if you donated blood on the 1st of March 2022:

  • If you are a woman, you are safe to donate again from the 21st of June 2022; and
  • If you are a man, you can safely donate from the 24th of May 2022.

How do I use the blood donation due date calculator?

Just two simple steps to know the date for your next blood donation:

  1. Select your gender from the drop-dox box for Gender. The tool will tell you the minimum duration between donations for your gender.
  2. Click on the calendar icon in the Last donation date row.
  3. Select the date of your last blood donation from the calendar.

Our blood type calculator helps you find out what blood type will a baby have. Also, you can predict the blood volume in newborn babies and infants based on their weight using Omni's pediatric blood volume calculator.


What are the processes involved in blood donation?

Blood donation involves four steps:

  1. Registration;
  2. Medical history and mini-physical;
  3. Donation; and
  4. Refreshments. 🥤

Do I need a medical certificate to donate blood?

No, you don’t need a medical certificate to donate blood. But you must undergo a physical examination and a blood test to know your hemoglobin level before donating blood at the donation center. This mini-physical examination involves checking your temperature, blood pressure, and pulse.

What is the minimum level of hemoglobin needed to donate blood?

The minimum level of hemoglobin needed to donate blood is 12.0 g/dL for females and 13.0 g/dL for males.

What excludes me from donating blood?

You cannot donate blood if:

  • Your hemoglobin level is lower than the minimum level of hemoglobin needed to donate blood (12.0 g/dL for females and 13.0 g/dL for males);
  • You have low or high blood pressure;
  • You have any blood-related diseases;
  • You are taking certain medicines like blood-thinners or antibiotics;
  • You were vaccinated recently;
  • You are tested positive for hepatitis B, hepatitis C or HIV infection;
  • You are pregnant; or
  • You have tattoos or piercings.

When can I donate blood if I have a cold or the flu?

If you have a cold or the flu, you can donate blood 7 days after you've recovered from your symptoms.

How much blood can I donate at once?

A typical donation is one US pint or 450 ml of whole blood. This is about 8% of the average adult's blood volume. The body replaces this volume of blood within 24 to 48 hours and replenishes the lost red blood cells in 10 to 12 weeks.

Is donating blood healthy?

Yes. Though some people may feel dizzy or nauseous, have bleeding at the needle site, or have arm pain or numbness for some time, donating blood doesn’t cause any damage to your health. Researchers even state that regular blood donation lowers blood pressure and lowers the risk for heart attacks.

Do you want to learn about pediatric blood transfusions? Take a look at our pediatric blood transfusion calculator.

Mehjabin Abdurrazaque
The recommended period between donations is at least 16 weeks for females.
Last donation date
Next donation date
Check out 26 similar hematology calculators 🆎
4Ts scoreAbsolute eosinophil countAbsolute lymphocyte count… 23 more
People also viewed…

Body fat

Use our free Body Fat Calculator, based on BMI, to determine your body fat percentage and explore your ideal body fat range.

EER (Estimated Energy Requirement)

EER calculator estimates the average dietary energy intake that is should to maintain the energy balance in healthy, normal weight individuals.

Max vaccine immunity

The post-vaccine immunity calculator will tell you the exact day when you can finally feel safe from COVID-19.


The perfect snowman calculator uses math & science rules to help you design the snowman of your dreams!
Copyright by Omni Calculator sp. z o.o.
Privacy, Cookies & Terms of Service