Cannabis Edibles Potency Calculator & Dosing Guide

Use the calculator below to estimate THC and CBD per serving in your homemade edibles. Then read the guide to understand what those numbers actually mean — and how to dial in the right dose for your experience level.

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Homemade edibles are powerful — often more potent than people expect. Unlike dispensary products with lab-verified milligram counts printed on the label, homemade edibles require you to estimate potency based on your cannabis's THC percentage, how much you used, and how many servings you're making.

This calculator does that math for you. But numbers alone don't tell the whole story — scroll past the calculator for a complete guide to understanding, controlling, and adjusting your dose.

Cannabis Edibles Potency Calculator

How to use it:

1. Fill in the first sentence about your infusion: how much flower you used, its Total THC % from the label (add CBD % if you like), and what you infused it into. Total THC already accounts for decarboxylation, so use it rather than the separate THC or THCA numbers.
2. Pick what you want to work out:
   • How strong is my recipe? Say how much of the infusion went into the recipe and how many servings it makes. You'll get the THC per serving and how strong that is.
   • How much should I use? Say how many servings the recipe makes, how much butter or oil it calls for, and the dose you want per serving. You'll get how much of your infusion to use, and how much regular butter or oil makes up the rest.

The calculator remembers your last entries on this device, so your infusion is there next time you cook.

How accurate is this estimate?

Honest answer: it's an approximation, not a guarantee — and understanding why helps you dose more safely.

Several factors affect real-world potency that no calculator can fully account for:

THC percentage on packaging isn't exact. Cannabis testing varies between labs and batches. The number on your package is a reasonable estimate, not a precise measurement. Treat it as a starting point.

Infusion efficiency varies. Not all of the THC makes it from the plant into your butter, oil or alcohol, and some stays behind in the plant material you strain out. Lab measurements range from about 40% to 90%: pharmacy-made olive oil preparations recovered 57.6–86.3% of the THC across nearly 5,000 samples (Dei Cas et al., 2020), while professional butter infusions typically land around 40–60% (Leafly). Time, temperature and straining matter more than which fat you choose, and side-by-side lab tests haven't found one oil consistently beating another.

The calculator assumes 80% for every infusion base. That's near the top of the range on purpose: if the estimate is off, your edibles are more likely to be weaker than expected than stronger.

Decarboxylation completeness matters. If your decarb was rushed or done at the wrong temperature, less THCA converted to THC, meaning lower actual potency than the calculator suggests.

Distribution in baked goods isn't perfectly even. Even with a well-made infusion, some servings may be slightly stronger or weaker than others based on how the fat distributed during baking.

What this means in practice: Always treat the calculator's output as an estimate and start with a smaller portion than you think you need — especially with a new batch.

Dosing guide: what do these numbers mean?

Standard dose reference points

These are general guidelines. Individual response varies significantly based on body weight, metabolism, tolerance, and whether you've eaten recently.

The most important rule

Start low, wait long. Edibles take 30 minutes to 2 hours to kick in — sometimes longer on a full stomach. The #1 cause of bad edible experiences is re-dosing too soon because "nothing's happening yet."

If you're new to edibles or trying a new batch: start with 2.5–5mg, wait 2 full hours, then assess. You can always take more. You can't un-take what you've already had.

How to control potency in your recipes

Once you know your infusion's estimated potency per tablespoon, you have several ways to hit your target dose per serving.

Method 1: Adjust the ratio of infused to regular fat

This is the easiest approach. If your recipe calls for 1 cup of butter and your cannabutter is stronger than you want, use a mix — say, ½ cup cannabutter and ½ cup regular butter. The infused portion carries all the THC; the regular portion just fills the recipe requirement.

Example: Your cannabutter has 50mg THC per tablespoon. Your cookie recipe uses 8 tablespoons of butter and makes 16 cookies. That's 400mg total ÷ 16 = 25mg per cookie. Too strong? Use 4 tablespoons cannabutter + 4 tablespoons regular butter → 200mg total ÷ 16 = 12.5mg per cookie.

Method 2: Make a weaker infusion

Use less cannabis per cup of butter or oil when you make your infusion. Our cannabutter guide and coconut oil guide both give mild-to-strong ranges — start at the mild end if you're new or making edibles for mixed-tolerance groups.

Method 3: Make smaller servings

Cut your brownies smaller. Make smaller cookies. The math works in your favor — the same batch at 24 pieces instead of 12 is exactly half the dose per piece.

Method 4: Make a stronger infusion, dose by drops

For precise microdosing, a potent tincture is the most controllable format. See our cannabis tincture guide — tinctures let you dose by the drop, making it easy to add a precise amount to food or drink.

Dosing for specific use cases

For sleep

People who use edibles to wind down at night often report that higher doses (10–25mg THC) combined with CBD work best. Effects should be felt within an hour of your target bedtime — accounting for onset time. Make your edible part of a wind-down routine, not a last-minute decision.

For microdosing during the day

Stay under 5mg THC — ideally 2.5mg. A strong infusion diluted heavily in a recipe, or a tincture dosed carefully, gives you the most control at this level. Many people like to keep some CBD in the mix and say it takes the edge off THC, though the research on that is mixed.

If you use cannabis for aches and pains

Some people in this situation report that a balanced THC:CBD ratio with moderate THC (5–15mg) suits them better than THC alone. That's anecdotal, not medical advice. If you're managing pain, talk to your doctor, especially if you take other medications.

For first-timers

2.5mg. No exceptions. Give it two hours. You can always have more next time — but a bad first experience can put people off edibles entirely, and that would be a shame.

For cooking for groups with mixed tolerances

Make lighter infusions (lower cannabis-to-butter ratio) and label everything clearly. Better to underestimate than to accidentally overwhelm a guest. Leave uninfused versions of the same food available.

What if I don't know the THC percentage?

If your cannabis doesn't have a THC percentage listed — older homegrown material, gifted flower, trim — you can still estimate, just with more uncertainty.

General ballparks by material type:

Use the midpoint of the range for your material type and treat your first batch as a test batch — start with a small portion and wait.

Frequently asked questions

Ready to make your infusion?

Now that you know your target dose, pick your infusion base and get cooking:

• How to make cannabutter — most versatile, works in almost any baking recipe
• How to make cannabis coconut oil — great for vegan baking and capsules
• How to make cannabis olive oil — best for savory cooking and dressings
• How to make cannabis tincture — most precise for microdosing
• Browse all recipes

Or go back to the beginning with our Cannabis Edibles 101 guide if you're just getting started.