How much water to drink in a day according to weight kg calculator

Byline: Jennifer Stone, PT, DPT, OCS, Clinic Supervisor

Summer is right around the corner … and with it, summer activities, warmer temperatures and an increased risk for dehydration. Here are some tips to help you make sure you are drinking enough fluids to maintain good levels of hydration.

You are probably all aware of the “cardinal rule” that says adults should drink six to eight 8-ounce glasses of water per day. The truth is, this is an estimate and the actual amount you should be drinking per day can vary quite significantly. There are multiple factors that can impact how much water you should be drinking.

Weight

Your weight is one variable that changes the amount of water you should be drinking. To help you establish a baseline, you can use the following rule-of-thumb equation described in U.S. News & World Report.

How much water to drink in a day according to weight kg calculator

In short, the equation tells you to take half your body weight, and drink that amount in ounces of water. In the example, notice that you should be drinking more than 12 glasses of water, not eight!

Exercise

Your exercise habits affect the amount of water you should be drinking, as well. The American College of Sports Medicine recommends adding 12 ounces of water to your daily intake for every 30 minutes that you plan to work out.

How much water to drink in a day according to weight kg calculator

If you are exercising outside and it is very hot, you may need to add more.

Special considerations

There are several special considerations to maintaining a healthy hydration level. If you are pregnant or breastfeeding, you need to increase your fluid intake by 24 to 32 ounces depending on how much you weigh, according to the American Pregnancy Association. It is also important that you get a lot of your hydration from water. If you are primarily drinking sodas or caffeinated beverages such as coffee or tea, you do not get as much “bang for your buck” when it comes to fluid intake (i.e., they don’t “count” as much).

Rules of thumb

The good news is there are some fairly easy rules of thumb to follow when it comes to hydration. One of the important ones is to pre-hydrate. In other words, drink BEFORE you start feeling thirsty, or BEFORE you do an activity. Going running? Drink several glasses of water before you start. Thirst is actually a sign of dehydration, so if you feel thirsty, you have some catching up to do!

Also, monitor your urine. If you are adequately hydrated, you should be urinating about once every two to four hours, and your urine should be colorless or a very pale yellow (the color of hay or lighter). If it is darker than that, you haven’t had enough fluid. Headaches and dizziness are a late sign of dehydration. If you start experiencing those, you really need to up the water intake, and quickly.

Dehydration can turn a fun summer activity into an unpleasant experience at best, or a trip to the emergency room at worst.

Don’t wait until it’s too late. Bring water bottles with you, and keep yourself and your family hydrated during your summer fun!

More info:

  • Physical activity programs from the university’s Healthy for Life Wellness program for faculty and staff. These include the Million Step Pedometer Program and the Ride to Wellness Odometer Program, which provide tools to help you get walking and biking.
  • Download walking maps/trails for each campus.

Sources cited:

  • Buffardi, Danielle (2012, November 13). “Staying Hydrated And Nourished During Pregnancy,” American Pregnancy Association. Retrieved at http://www.americanpregnancy.org/pregnancyblog/2012/11/staying-hydrated-and-nourished-during-pregnancy/.
  • Casa, Douglas, Clarkson, Priscilla and Roberts, William (2005). American College of Sports Medicine Roundtable on Hydration and Physical Activity: Consensus Statements, American College of Sports Medicine. Retrieved at http://www.acsm.org/docs/publications/Roundtable%20on%20Hydration%20and%20Physical%20Activity.pdf?sfvrsn=0.
  • Elkaim, Yuri (2013, September 13). “The Truth About How Much Water You Should Really Drink,” U.S. News & World Report. Retrieved at http://health.usnews.com/health-news/blogs/eat-run/2013/09/13/the-truth-about-how-much-water-you-should-really-drink.

About the author: Jennifer is a Clinic Supervisor for Mizzou Therapy Services (Rangeline location) and a board-certified specialist in orthopedic physical therapy. She is also CAP certified in women’s health physical therapy. She has five years of experience in physical therapy and earned her Master’s degree from Texas State University, her doctorate from Massachusetts General Hospital Institute for Health Professions, and completed an orthopedic residency through Evidence in Motion.

How do I calculate how much water I need for my weight?

Your general water requirements can be determined using your current body weight. Most people need to drink roughly half of their weight (in pounds) in ounces. For example, a 200-pound adult needs approximately 100 ounces of water each day. Of course, your water needs will increase with any physical activity.

How much water should a 70 kg woman drink?

Weight. 60% of our body is water. For a person weighing 70kg, that means 42 kg or 42 litres!

How much water should I drink a day by weight calculator?

If you want to determine the exact amount you should drink according to your body weight, you can follow these steps: Take your weight (in pounds) and divide that by 2.2. Multiply that number depending on your age: If you're younger than 30, multiply by 40. If you're between 30-55, multiply by 35.

How much water should I drink a day if I weigh 80 kg?

Drinking water according to body weight varies from individual to individual. Assuming a person is around 80 kg, he should multiply his weight by 0.033 and find out how many ways he needs to drink in a day (80* 0.033 = 2.64). Anyone who weighs 80 kgs should drink 2.64L of water.