How to Calculate How Much Water You Should Drink A Day

By Kristen Mccaffrey on

Lots of people don't realize the true importance of drinking enough water everyday and how it can impact both your health and your weight loss efforts. According to experts in a recent study, drinking just 2 cups of water, which is smaller than the size of a bottled soda, before meals helped dieters lose an extra five pounds yearly and help you maintain your weight loss. Additionally drinking the right amount of water daily can actually speed up your metabolic rate and help to curb overeating when your body confused hunger and thirst. But how much water is enough? Here is how to calculate how much water you should drink a day for both health and weight loss benefits.

  1. Your weight: The first step to knowing how much water to drink everyday is to know your weight. The amount of water a person should drink varies on their weight, which makes sense because the more someone weighs the more water they need to drink. A two hundred pound man and 100 pound woman require different amounts of water every day.
  2. Multiply by 2/3: Next you want to multiple your weight by 2/3 (or 67%) to determine how much water to drink daily. For example, if you weighed 175 pounds you would multiple that by 2/3 and learn you should be drinking about 117 ounces of water every day.
  3. Activity Level: Finally you will want to adjust that number based on how often you work out, since you are expelling water when you sweat. You should add 12 ounces of water to your daily total for every 30 minutes that you work out. So if you work out for 45 minutes daily, you would add 18 ounces of water to your daily intake.

Daily Water Intake Calculator

Use this hydration calculator to learn how much water you should drink daily based on your weight and activity level.

It is recommend that you drink: Enter your information above and hit "calculate"

To make it a littler easier to calculate how much water to drink everyday, here are the recommended amounts for a range of weights. Remember to adjust for your activity level.

Weight Ounces of Water Daily
100 pounds 67 ounces
110 pounds 74 ounces
120 pounds 80 ounces
130 pounds 87 ounces
140 pounds 94 ounces
150 pounds 100 ounces
160 pounds 107 ounces
170 pounds 114 ounces
180 pounds 121 ounces
190 pounds 127 ounces
200 pounds 134 ounces
210 pounds 141 ounces
220 pounds 148 ounces
230 pounds 154 ounces
240 pounds 161 ounces
250 pounds 168 ounces

Tips for Reaching Your Daily Water Goals

So now that you know how much water you should be drinking everyday, let's talk about how to make sure you actually get enough. Drinking over 100 ounces of water may seem impossible at first, but with these easy tips you can reach your goal in no time.

  • Drink 2 cups (16 oz) of water before every meal: Science has proven that drinking 2 cups of water before every meal helps you to eat less during meal time and lose weight. If you do this three times daily - at breakfast, lunch, and dinner - you have already consumed 48 ounces of water.
  • Morning and Night: Get into the habit of drinking one glass (16 oz) of water when you wake up and another 8 oz glass before you go to sleep every night. This will add another 24 ounces of water to your daily intake. The easiest way to do this is to keep a glass or container of water at your bedside, that way as soon as you wake up and start your day, you can begin drinking water.
  • Keep Track By Your Container: One thing that has proven to help people consumer enough water daily is to buy a special container for their water, like this one or this one, and set a goal of how many times they will fill an finish the container. For example, if you buy a 16 oz container and need to drink 80 ounces of water a day, your goal would be to drink 5 of those daily. Need to drink more water? Try a larger container.
  • Infuse Your Water With Flavor: Water doesn't have to be boring and infusing your water with fruit, herbs, and other flavors can make it much easier to reach your daily goal. Try adding cucumber, strawberries,lemons, limes, and fresh herbs to create flavorful water. This fruit infusion water pitcher is a great way to always have great tasting water on hand.
  • Bubbles: Consider carbonated and sparkling water in addition to regular water. Many people find that adding sparkling water and 0 calorie flavored water makes drinking water throughout the day more fun. Find yourself drinking lots of expensive sparkling water? Consider buying a sodastream and make your own delicious sparkling beverages at home.
How to Calculate How Much Water You Should Drink A Day

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On How to Calculate How Much Water You Should Drink A Day
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Jenny Exner
January 28, 2019 - 13:57
That is nowhere near enough water for a person who works in a hot and dry environment. Nevermind taking into consideration: height (along with weight), sodium intake, smoker/non-smoker, diet (foods high/low in water), alcohol consumption, activity levels, medications and/or vitamins and supplements that might require more or less water intake. There's SO much to consider - this calculator is a great suggestion, but nowhere near accurate for every gender and size of human.
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December 27, 2018 - 18:11
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Love the site
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September 15, 2018 - 20:30
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I am a vegetarian soo I hope you have recipes that cater for people like me and I have a million food allergies. My goal is too reach my acquired BMI.
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July 22, 2018 - 02:46
You are dizzy because you are way under your water need - yes you will loose salt through sweat.. but you also loose water through sweat - the more you sweat the more you need water. 40oz for 160lbs is WAY to little.
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July 13, 2018 - 19:05
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I drink 40oz of water a day (its marked on my bottle) and I weigh 160lbs. I work in a hot and dry environment. And 40oz of water is TOO MUCH WATER. I lose so much salt and vitamins I get dizzy and black out. And I wake up in the night with a full bladder. You should just about drink a cup of water with each meal. its not rocket science. If you're working extra hard drink electrolyte drinks on top of that.
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July 2, 2018 - 10:57
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If you're drinking enough water for your body AT A HEALTHY WEIGHT, you're drinking enough water. Increasing intake beyond what the kidneys can process (approximately 3.5L/hour) is harmful and potentially deadly. The way to calculate the amount of water to drink is to find a healthy weight for your height & multiply it by .5. Of course, your intake might go up with added exercise or in hot weather but intakes above twice that can deplete vital nutrients and more than that can cause hyponatremia, which is extremely dangerous.
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David Jones
May 31, 2018 - 12:57
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I am 300 pounds so does that mean I should drink 150 ounces of water a day and if so what time should I get up and how much should I drink an hour.
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May 25, 2018 - 10:01
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Great info , include info on diet websites and diabetics website. Most people don't know the amount of,water the actually need which can change there health along with eating more vegetables and way less carbs. Thanks...
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May 7, 2018 - 12:19
First, I think your chart is a great starting point for healthy hydration. But I'm wondering, what's your source for this chart and calculation? Most clinicians, researchers and even U.S. agencies (i.e., FDA, CDC, USDA, OSHA, etc) all distance themselves from a quantity-specific recommendation since hydration needs are wildly variable from person to person and from one environment to another.

As I mentioned, your chart is a good starting point but people should really take into consideration their health, overall fitness, daily activity levels, and environment (for example, exposure to high temperatures) in assessing their individual hydration needs. Relying on a static formula with one or two variables (like weight or age) could leave many people short of healthy hydration.