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Rule of Threes: The Basic Guide To Survival


When push comes to shove, don’t forget the rule of threes of survival!

In this article:

  1. Three Minutes Without Air
  2. Three Hours Without Shelter
  3. Three Days Without Water
  4. Thirty Days Without Food

The Survival Rule of Threes to Learn Today

 

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Simply Stated

Three rules to survive | The Survival Rule of Threes

Remembering the rule of threes is what’s going to separate you from the rest of the world when SHTF. In an extreme situation, a person cannot survive for more than:

  • 3 minutes without air
  • 3 hours without shelter
  • 3 days without water
  • 30 days without food

Note that this is not a guarantee. Take shelter, for instance.

If you fall into and stay in a large body of cold water, it is highly unlikely you will last three hours. If you end up on dry land and with nice weather, you may live for over three hours.

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These rules are your guide when your experience is different from what you learn from the book. Mind you, both can vary significantly.

Given your set of skills and equipment, how do you make sure you survive for as long as you can?

Applying the Rule of Threes

Let’s expand on this and consider three seconds. What can kill you in three seconds?

You die when someone shots you, for sure. But then, you may also meet your demise by simply falling over and cracking your skull.

You can also perish if a blunt object hits any part of your body.

In the first scenario, you may have to check your weapons and self-defense skills. How do you counter a gun attack?

In the second situation, your climbing knowledge or sense of balance will play a key. Lastly, in the third situation, your agility and alertness may help you survive.

All these may need your avoidance skills. How fast can you dodge a bullet or any type of attack?

Sometimes, these situations can occur in the darkness. Your skills may be useless if you don’t have enough light sources such as a flashlight.

Three Minutes Without Air

Cloudy skies | The Survival Rule of Threes

Three minutes without air is definitely a problem, but there is not a lot one can do about that. If you KNOW you are going to be in a place without air, then perhaps you can include having tanks of air on your to-do list.

But this is not practical just “in case.” No, about all you can do is have a filtration mask to filter out “bad” stuff in any air which does exist.

This might be a full CBRN mask, all the way down to a wet bandana, depending on likely circumstances, weight, space, and even budget.

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Three minutes with severe bleeding is also a problem, and there are practical options for this. It includes various types of tourniquets and combat bandages. Although this is not considered as one of those in-demand skills.

What is a tourniquet? It’s a tool used to stop the blood flow through the veins by compressing the limb with a bandage or cord.

Three Hours Without Shelter

Happy man inside tent | The Survival Rule of Threes

A shelter is a difficult subject which requires more in-depth discussion. First of all, a really good shelter is not portable.

Then a decent shelter (a good tent, insulating pad, and sleeping bag), while portable, tends to be larger and heavier than other equipment. But, it is often possible to make a shelter using material at hand.

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This may be a long process, though. In some circumstances, it may not be practical within the time limits as well.

Thus, the rule of thumb is having materials and tools to assist in building a shelter is usually wise. Consider what “shelter” really entails, too.

Basically, it is that the human body can only last in an environment which is significantly outside its “normal” range. “Exposure” is perhaps the leading cause of death for those lost or trapped “in the wild.”

If the body gets “too cold” or “too hot” long enough, it will shut down or at least result in serious injury. Thus, “shelter” requires materials and skills to keep the body dry when it is wet, warm when it is cold and/or cool when it is hot.

Keep in mind that the temperature of a large object (ground or body of water) with which the body is in contact is at least as dangerous as the temperature of the air. So any consideration of shelter must include insulation from the ground.

Fire can be a key component of “shelter” as well as many other survival aspects. That is why having fire making equipment and skills is critical.

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Three Days Without Water

Silhouette of nab drinking water | The Survival Rule of Threes

Water is pretty straightforward. Although it is possible to live for three days without it, this should not go on.

It will be very unpleasant and may cause long-term damage. It also reduces your ability to think and act in support of other survival aspects.

To avoid this, you can have water stored and/or have ways of getting, carrying, and using the water you find. It is also wise to always assume that water may have contaminated particulates present.

Therefore, also consider the skills and equipment necessary to “purify” these problems. Not to mention, the skills to “find” water which may not be readily visible.

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Three days with serious illness could be a problem as well, so consider ways of preventing and curing infections, as well as other dangerous diseases.

Thirty Days Without Food

Man preparing his breakfast | The Survival Rule of Threes

Food then would be the lowest priority, but not ignored. Like with water, going without food for significant periods of time is not only unpleasant but reduces your ability to think and act. It can eventually result in long-term damage as well.

Again, you can have food stored and/or have the skills and equipment to get food from the environment around you. Keep in mind though, that all “food” is not created equal.

Be aware that filling your belly may be ok short term but should not be your long-term goal. You want to have food which has the stuff your body needs (vitamins, minerals, protein) and as little “harmful” stuff as practical.

Something to keep a particular eye on is “calories.” If you look for storage food, you may find places which brag on the number of “servings” they offer.

Do the math. If the calories per day are under 800, then you are looking at a diet which is usually only appropriate for an extreme weight loss regimen which is doctor monitored.

This would not be appropriate for long-term survival. Usually, the recommendation for a minimal survival diet is 1200 calories per day, and if you will be active, 2000 calories per day may not be too much.

Related:  My Mobile Alternative Energy Experiences, AGM batteries

Another Application of the Rule of Threes

As we see, the “Rule of Threes” provides guidance on selecting which skills and equipment you might need. It also is a key factor in deciding your ACCESS to the equipment.

If you have the defensive equipment, it needs to be immediately available. In a holster or sheath or pouch on your person is just barely adequate.

I suspect if someone was to attack you, the odds are pretty low that you could talk them into waiting while you dig out your defenses from the bottom of your pack. Similarly, your air filtration and severe bleeding equipment should be easily and reliably available in under a minute.

This means in an external pocket(s) or pouch(s), probably with nothing else in there. They should also be secured but accessible because you don’t want to lose the items in the process.

A light source should also be readily available, and reliably accessible in total darkness. After this, access becomes less critical.

Fire equipment should be fairly accessible, and perhaps some of the shelter supplies. Everything else can be packed where it best fits, within reason.

Things Which Are Not “Critical” Can Still Be Important

When considering long-term survival, remember that there are a number of things which although not a matter of “life or death,” make survival easier. Or, at least more pleasant and reduce the long-term impacts of the emergency.

Toilet paper and toothbrushes are things which first leaped to my mind but I’m sure there are things which occur to you.

Bottom Line

Note that the “Rule of Threes” is a guide to PRIORITY, not IMPORTANCE. For instance, if you don’t have food, you will die just as surely as if you don’t have air.

Both are equally important to stay alive. The first one deals with an immediate problem while the other deals with a longer-term problem.

When you are evaluating the gaps in your skills and materials, look at your needs in priority order, but do look at ALL of your needs.

Consider the amount of space available and your budget, and use this to figure out a realistic survival timeframe. Then, try to “match” the amounts of any supplies.

It might not be useful to have a year’s supply of food and a month’s supply of water, or a year’s supply of water and a month’s supply of food. Unless you knew that you could replenish whatever it was you only had a month’s worth of.

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Watch this video from Andy Froy’s Bushcraft & Survival Guides to learn more about the survival Rule of Threes:

We need not stress enough how knowledge and preparedness is key to survival. In fact, tidbits of info like the rule of threes may mean the difference between survival and demise for you.

With that, arm yourself with this know-how and try to use it every day so you are always ready, come what may.

What do you think of the rule of three survival guide? Let us know your thoughts about it in the comments section below!

Up Next: 10 Survival Tips That Could Save Your Life

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Editor’s Note: This post was originally published on April 10, 2018, and has been updated for quality and relevancy.

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Last update on 2019-02-11 / Affiliate links / Images from Amazon Product Advertising API

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