Know Your Numbers Before You Bake a Single Batch
Understanding how many grams in an ounce is the first step to safe, consistent homemade edibles.
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You’re standing in your kitchen in Adams Morgan with a bag of flower, a stick of butter, and absolutely no idea how many grams in an ounce β and honestly, that’s where most edible disasters begin.
Let’s get the big one out of the way: how many grams in an ounce? It’s 28.35 grams, though most folks in the cannabis world round it down to an even 28. That number matters more than you’d think, especially when you’re a DC medical cannabis patient trying to calculate THC per serving in a batch of brownies or gummies. Get it wrong by even a few grams and your edibles go from pleasantly relaxing to a five-hour staring contest with your ceiling fan. We’ve seen it happen β more often than we’d like to admit.
At Green Legacy, our staff walks patients through these conversions pretty much every day. Whether you’re picking up a quarter or a full ounce for a cannabutter project, we’ll point you to the exact THC percentage on the lab report so you can plug real numbers into your dosing math. You can also browse our COA library from home before you even step through the door β because nobody should be guessing when milligrams are on the line.
I’ll never forget the patient from Dupont Circle who came in after making her first tincture. She’d used an entire ounce of 27% flower and split it into only four bottles. Each dropper was roughly 50 mg β way beyond what she needed for her chronic pain. We sat down together, recalculated the ratios, and she’s been making perfectly dosed 5 mg tinctures ever since. (She even brought us cookies last month. Properly dosed ones, thankfully.)
“Cannabis math isn’t hard β it’s just unforgiving when you skip it. A kitchen scale and a COA are the two cheapest insurance policies you’ll ever own.”
— Green Legacy
DOSING ESSENTIALS
5 Conversions: How Many Grams in an Ounce & Beyond
Ounce to Grams Baseline
One ounce equals 28.35 grams β round to 28 for cannabis math. This is the conversion every single edible recipe starts with, so tattoo it on your brain (or just bookmark this page).
THC Milligrams per Gram
A gram of 20% THC flower contains roughly 200 mg of THC. Multiply grams by the THC percentage (as a decimal) by 1,000 to land on total milligrams β that’s your starting budget for the whole batch.
Decarb Loss Factor
You’ll lose about 10-15% of your THC during decarboxylation. So if your raw flower math says 5,600 mg from an ounce, plan on roughly 4,760-5,040 mg of activated THC actually making it into your butter or oil.
Serving Size Division
The DC medical cannabis program recommends starting low β 2.5 to 5 mg per serving. Divide your total activated THC by your desired per-serving dose to figure out how many servings your batch should yield.
Butter-to-Flower Ratio
A common cannabutter recipe calls for one ounce of flower (28 g) to one pound of butter (four sticks). That gives you enough fat to bind the THC evenly, and the math stays clean when you portion out recipes later.
See What’s Fresh
Need flower with a verified THC percentage for your next infusion? Browse the Green Legacy menu and check lab results before you shop.
Best Flower for Edibles: Our Top Infusion-Friendly Picks
Every strain below comes with third-party lab results you can verify in our COA library β because guessing THC content is how bad brownies happen.
Come Say Hey
Green Legacy sits right in the heart of DC. Whether you’re swinging by after work or making a special trip, we’re here to make it easy β and worth it. Pop in, say hey, and let us help you find exactly what you’re looking for.
4630 14th St NW, Washington, DC
Available across DC β check delivery zones
greenlegacydc.com
4630 14th St NW
Washington, DC
Frequently Asked Questions
Your Questions on How Many Grams in an Ounce & Edible Dosing
How many grams in an ounce of cannabis?
There are 28.35 grams in an ounce β the cannabis industry typically rounds to 28 grams. Knowing this is essential before you start any edible recipe because it’s the foundation for every THC-per-serving calculation. For lab-verified potency numbers to plug into your math, check out the Green Legacy COA library.
How do I calculate THC per serving when making cannabutter?
Multiply the grams of flower by the THC percentage (as a decimal) by 1,000 to get total milligrams. Then subtract about 12% for decarb loss, and divide by the number of servings in your recipe. Leafly has a handy dosing calculator if you want to double-check your work.
What’s a safe starting dose for homemade edibles in DC?
The DC Medical Cannabis Program and most clinicians recommend 2.5 to 5 mg of THC per serving for new patients. You can always take more after two hours, but you can’t un-eat a 50 mg cookie. Start low, go slow β it’s a clichΓ© because it’s genuinely good advice.
Do I need a medical card to buy flower for edibles in DC?
Yes. To purchase cannabis from a licensed dispensary like Green Legacy, you’ll need a valid DC medical cannabis card or a temporary registration from the ABCA. Our team can walk you through the process β just book a consultation if you have questions.
Does it matter what strain I use for homemade edibles?
Absolutely. Strains with higher THC mean you’ll need less flower per batch, which changes your how many grams in an ounce math entirely. Terpene profiles also affect the flavor and, some patients say, the character of the high. We recommend picking a strain with a consistent COA so your dosing stays predictable batch to batch.