Evidence based

Beginners Guide to Dosing CBD Oil

Learn how to calculate your dose of CBD like a pro using your specific weight. We cover everything you need to know about dosing CBD in this comprehensive guide.

Article By
Justin Cooke , posted 2 months ago

  • Table of Contents

There’s a lot of information going around about the many health benefits of CBD oil, but the information is less clear on exactly what dose to take.

We aim to bust the doors wide open on CBD oil dosing and definitively answer the question about what the right dose is, and how to calculate it for yourself if you want to be as accurate as possible.

We go over some general dosage guidelines, how the dose can change from one person to the next, and how to calculate your own optimal dosage based on weight and the potency of the CBD oil you purchased.

cbd dosage

How to Dose CBD Oil

Dosing CBD oil can seem confusing at first.

Everybody reacts to CBD differently, which can change the dose a lot.

We often find two people, who are the same sex and have virtually identical weights and height, who respond very differently to the same dose of CBD.

The first one might find a dose of 5 mL of CBD oil perfect for reducing their pain and inflammation, while the next person finds no relief until 40 mL. Others may be the opposite and find an effective dose closer to just a few drops.

This, of course, makes it very difficult to answer the question;

How Much CBD Oil Should I Be Taking?

There are some general guidelines that can help you ballpark the dose, however, it’s important to always start below this dose and work your way up from there. This is to make sure that you test how reactive you are with a smaller dose before jumping up a level.

It’s better to start with a lower, ineffective dose and build up to a higher, effective dose gradually. You don’t want to take way too much the first time and experience uncomfortable side effects for the rest of the day.

General Rule of Thumb for Choosing a Dosage Strength:

  • Low strength → 1 mg CBD per 10 pounds
  • Medium strength → 3 mg CBD per 10 pounds
  • High strength → 6 mg CBD per 10 pounds

It’s important to note that this measurement is in pure CBD, not CBD oil.

We’ll go over calculating how much this equates to in CBD oil later on.

For now, here’s a chart of rounded weights, and the resulting doses per weight in pure CBD.

Doses of CBD by Weight & Strength (in mg)

Weight (lbs)Low StrengthMedium StrengthHigh Strength
100 lbs10 mg30 mg60 mg
125 lbs13 mg38 mg75 mg
150 lbs15 mg45 mg90 mg
175 lbs17 mg52 mg105 mg
200 lbs20 mg60 mg120 mg
225 lbs22 mg67 mg135 mg
250 lbs25 mg75 mg150 mg

Ask Yourself: “What am I Taking CBD for Exactly?”

This is an important question to ask because it will guide you in the direction of the right dose to take.

  • General health → low strength
  • Nausea → low to medium strength
  • Chronic pain → medium to high strength
  • Sleep disorders → medium to high strength
  • Anxiety → medium to high strength
  • Epilepsy → high strength or pharmaceutical grade
  • Cancer → high strength or pharmaceutical grade
  • Migraines → low to high strength

Dosing CBD: 4 Steps to Dosing Like a Pro

The easiest way to start dosing is to find where you fall in the table above, start dosing with the low strength and build your way up from there.

Never start at the high strength if you‘ve never used CBD oil before.

If you want to get even more accurate with your dosing, follow the 4 steps below.

Step #1: Determine the Potency of Your CBD Oil

The first step is to look at the CBD oil you have and determine its potency.

Sometimes the manufacturers will make this super easy for you, and tell you the concentration of CBD per mL of oil.

However, in most cases, this isn’t provided and you may need to do some quick calculations for yourself.

This may seem intimidating at first, but it’s actually pretty simple. All you need to do is enter the numbers into the formula below.

Here’s What You Need to Take Into Account:

  1. Bottle size (in mL)
  2. Amount of CBD listed on the bottle (300 mg, 600 mg, 1000 mg)

Use This Formula to Calculate Potency:

[CBD IN MG] ÷ [BOTTLE SIZE IN ML] = [CBD IN MG/ML]

Let’s use an example.

Royal CBD makes a hemp oil that advertises 600 mg. The bottle size is 1 ounce (30 mL).

Let’s put this into our formula:

[600 MG] ÷ [30 ML] = [20 MG/ML CBD].

Our Answer: 20 mg CBD for every 1 mL of liquid.

You can compare this to the reference chart above to see how much oil you’ll need to get the desired strength of CBD (AKA your dose). 

Now that we know this, the next step is to see how much fluid the dropper holds. This will make dosing much easier later.

Step #2: Measure the Volume of Your Dropper

The dropper is the part of the bottle that’s used to dole out the CBD oil.

It usually comes with a squeezable head and a glass tube. It makes it easy to give exact doses of CBD oil in drop doses.

Most droppers are designed to hold exactly 1 mL of fluid.

This can vary depending on the manufacturer, so it’s best to measure first whenever using a new manufacturer to make sure your dosing is as accurate as possible.

Do do this, simply fill the dropper up as normal, and let it out one drop at a time, count the drops as you go.

You should end up somewhere around 20 drops.

Keep this number in mind for the next step.

Step #3: Calculate Your Dose

So now you need to decide on the dose you’re going to take.

Here’s the General Rule of Thumb for Dosing According to Weight & Strength:

 Weight MetricLow StrengthMedium StrengthHigh Strength
Imperial (pounds)1 mg  every 10 lbs3 mg every 10 lbs6 mg every 10 lbs
Metric (kilograms)1 mg every 4.5 kg3 mg every 4.5 kg6 mg every 4.5 kg

How To Calculate Dose From Your Weight

[YOUR WEIGHT IN POUNDS] ÷ [10] x [DESIRED STRENGTH IN MG] = [YOUR DOSE]

If you prefer metric, the formula changes only slightly:

[YOUR WEIGHT IN KG] ÷ [4.5] x [DESIRED STRENGTH IN MG] = [YOUR DOSE]

Here’s an example of this in practice:

Let’s say you’re a 170-pound male, and you’re looking for a medium strength dose.

You need to first divide your weight in pounds by 10 to see how many sets of 10 you have in your weight.

[170] ÷ [10] = 17.

Now you simply multiply 17.5 by the medium strength dosage guideline, which in this case is 3.

[17] x [3 mg] = 51 mg CBD

So a good starting dose for you would be about 52 mg CBD per day in this case.

Step #4: Tweak The Dose To Match Your Body

This is one of the most important steps.

Let me tell you why.

As mentioned earlier, everyone responds to CBD oil differently. This means that you need to assess how it affects you individually, rather than going off the experiences of everyone else.

Your friend may find the right dose at 20 mg, while you may require far more, or far less.

The only way to really identify this is to start with the dose calculated above, and then tweak it from there.

Perhaps you took 20 mg and didn’t find any relief in your symptoms, the logical step is to increase it to the next strength tier and reassess again.

In our example we went with the medium strength, perhaps next time we will calculate the higher strength (6 mg per 10 pounds);

[17] x [6 mg] = 102 mg CBD

Or perhaps you took the 20 mg and found excellent relief, but became a little too drowsy as a result, now it’s time to tweak the dose to a slightly lower amount.

This process is never finished, you’ll always be reassessing how it affects you, and changing the dose slightly to accommodate.

This is because each manufacturer is going to be slightly different depending on the other cannabinoids, terpenes, and phytochemicals are contained in the oil.

You may also find that a CBD isolate will require significantly higher CBD doses to work despite the high concentration.

This is because of something called the entourage effect.

This is the idea that a full-spectrum CBD oil has a stronger effect because of the other ingredients in the plant all working together to produce the effects.

Matching CBD Oil Potency with Your Dose

CBD oils come in a wide range of potencies.

You can find some that have 1500 mg of CBD oil in a small 15 mg bottle, while others have far less, with only 100 mg of CBD in a 30 mL bottle.

Reference Chart for Making Common Calculations in CBD Dosage:

Bottle Size300 mg600 mg1000 mg1500 mg
15 mL20 mg/mL40 mg/mL66 mg/mL100 mg/mL
30 mL10 mg/mL20 mg/mL33 mg/mL50 mg/mL
50 mL6 mg/mL12 mg/mL20 mg/mL30 mg/mL

This helps to put everything into context a little bit easier when deciding your dose.

For example, if you need a very low dose, it doesn’t make much sense to get a CBD oil with a very high potency because it would be too easy to take too much.

On the flip-side, if you require a high dose of CBD oil, you may need to drink half the bottle to get the desired effects when using a less potent extract.

Common CBD Oil Doses When By Drop (Assuming the Dropper Provides 20 Drops per mL):

Bottle Size300 mg600 mg1000 mg1500 mg
15 mL1 mg/drop2 mg/drop3.33 mg/drop5 mg/drop
30 mL0.5 mg/drop1 mg/drop1.6 mg/drop2.5 mg/drop
50 mL0.3 mg/drop0.6 mg/drop1 mg/drop1.5 mg/drop

From this, it’s easier to see how the different potencies work.

If you calculated earlier that the ideal dose for you per day is about 45 mg of CBD, you’re best off going with a higher dose product, such as the 1500 mg in a 15 or 30 mL bottle. You’d need only about 10-20 drops.

If instead, you purchased a low dose CBD oil, containing only 300 mg in a 50 mL bottle, you’re going to need to take 160 drops to get the dose you need.

Matching your dosage needs, with the product you buy is very useful for these reasons.

Conclusion & Where to Buy CBD Oil

Although CBD oil affects everyone differently, it’s useful to know the general rule of thumb for dosing so that you can find the right starting point.

As always, whenever trying a new supplement out for the first time, including CBD oil, you should always start with a much lower dose than you think you need, and build up slowly from there.

These guidelines are meant to help you identify the ballpark dose you could be aiming for. It’s meant to put it in perspective for you. With that said, you should never jump straight into the largest dose without properly testing it in lower amounts.

If you’re looking for high-quality CBD oil to get started, we recommend looking at our review page.

Further Reading

Further Reading