Tincture Math Made Ridiculously Simple
Finally understand how many grams in an ounce β and why it matters every time you fill a dropper.
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You’re standing in your kitchen in Adams Morgan, dropper in hand, squinting at a tincture label that lists milligrams per milliliter while you’re still trying to remember how many grams in an ounce β and honestly, you shouldn’t need a math degree to take your medicine.
Let’s start with the question that brings everyone here: how many grams in an ounce? The answer is 28.3495 grams, though in cannabis we almost always round to 28 grams flat. Simple enough on paper, but the moment you’re converting flower weight into tincture potency β factoring in extraction efficiency, carrier oil volume, and your own tolerance β that clean number gets complicated fast. Most DC medical cannabis patients we talk to aren’t confused by the math itself; they’re confused because nobody ever bothered to connect weed measurements to the actual dropper in their hand. That’s what we’re fixing today.
At Green Legacy, we spend a surprising amount of time at the counter walking patients through tincture conversions. It makes sense β sublingual dosing is one of the most precise ways to use medical cannabis, but only if you understand the numbers on the label. We carry lab-tested tinctures with clear potency breakdowns, and our staff can show you exactly how milligrams per dropper relate back to the gram-level measurements you’re probably more familiar with. If you’re anywhere in our DC delivery area, we can even walk you through it over the phone before your order arrives.
I had a patient last year β retired teacher from Dupont Circle β who’d been eyeballing her THC drops for months and wondering why her relief was so inconsistent. Turns out she was swinging between 5mg and 25mg per dose without realizing it. We sat down, did the conversion math together (she took notes, which was very on-brand), and within a week she texted us saying she finally felt like she was in control of her dosing. That’s the kind of thing that reminds you why precision actually matters β it’s not nerdy, it’s the difference between medicine working and medicine being a guessing game.
“Knowing there are 28 grams in an ounce is step one β knowing what that means inside your dropper is where real dosing confidence starts.”
— Green Legacy
Conversion Essentials
How Many Grams in an Ounce: 7 Key Conversions
Ounce to Grams Baseline
One ounce equals 28 grams (28.35 if you’re being precise). This is the foundation for every tincture calculation you’ll ever do. Memorize it like your PIN number.
Grams to Milligrams for THC
One gram equals 1,000 milligrams. So if your flower tests at 20% THC, that’s roughly 200mg of THC per gram β the starting point for figuring out how potent your homemade tincture will be.
Dropper Volume in Milliliters
A standard tincture dropper holds about 1mL of liquid. Most 30mL tincture bottles give you roughly 30 full droppers. Always check whether the label lists potency per dropper or per bottle β huge difference.
Milligrams Per Drop Math
One full dropper (1mL) contains about 20 individual drops. If your tincture is 600mg per 30mL bottle, that’s 20mg per dropper and roughly 1mg per drop. This is how you micro-dose with real accuracy.
Eighth-to-Tincture Conversion
An eighth is 3.5 grams. At 20% THC, that’s about 700mg of total THC β roughly equivalent to a mid-potency 30mL tincture bottle. Useful context when you’re comparing product formats at the dispensary.
See What’s Fresh
Ready to find a tincture that actually lists what you need to know? Browse Green Legacy’s delivery menu β every product comes with full potency details and lab results.
Tinctures & Flower We’d Actually Recommend for Precise Dosing
Every product listed here is third-party tested. Verify potency numbers yourself in our COA library.
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
How Many Grams in an Ounce & Other Tincture Dosing Questions
So really, how many grams in an ounce of cannabis?
There are 28.3495 grams in one ounce β we round to 28 grams in the cannabis world. This number is your starting block for every dosing conversion, whether you’re buying flower or calculating tincture potency. The DC Medical Cannabis Program tracks patient allotments in ounces, so knowing this conversion is especially useful for staying within your limits.
How do I figure out how many milligrams of THC are in my tincture dropper?
Check the label for total milligrams per bottle and total volume in milliliters. Divide the mg by the mL to get your per-dropper dose (since one dropper β 1mL). For example, a 30mL bottle with 900mg of THC gives you 30mg per full dropper. Leafly has a solid beginner’s dosing guide if you want to go deeper.
Can I make tincture from flower I buy at a DC dispensary?
Absolutely β DC medical cannabis patients can infuse their own tinctures at home. You’ll want to decarboxylate your flower first (around 240Β°F for 40 minutes), then steep it in high-proof alcohol or a carrier oil. Knowing how many grams in an ounce helps you calculate expected THC yield before you start. Our flower menu lists THC percentages so you can do the math upfront.
What’s the difference between sublingual dosing and just swallowing a tincture?
Sublingual means holding the drops under your tongue for 60-90 seconds so the cannabinoids absorb directly into your bloodstream. If you just swallow, the tincture goes through your digestive system like an edible β slower onset, different intensity. Most patients we see in Adams Morgan and Shaw prefer sublingual for faster, more predictable results.
How does ABCA regulate tincture products sold in DC?
The Alcoholic Beverage and Cannabis Administration (ABCA) oversees all licensed dispensaries in DC, including product testing and labeling requirements. Every tincture on our shelves has passed third-party lab testing for potency and contaminants. That’s not optional β it’s the law, and honestly, it’s one of the things that makes the DC medical program worth trusting.