THC mg ⇌ Percentage
* Note: For liquid products, 1 milliliter (ml) is approximated to weigh 1 gram (g) for standard conversion purposes. Actual density may vary slightly by formulation.
Know exactly how much THC is in any cannabis product. This free THC mg to Percentage Calculator converts milligrams to percentage — and percentage back to milligrams — in seconds.
Understanding the THC mg to Percentage Calculator
Reading a cannabis label is confusing. One product shows “10% THC.” Another says “200mg THC.” Neither tells you the full picture on its own.
Without the right formula, you are guessing your dose.
That guessing costs you. You take too little and feel nothing. You take too much and have a bad experience. This is a real problem for beginners and experienced users alike.
This calculator solves it instantly.
Enter your product weight or volume and the known THC value. The tool converts in both directions — mg to percentage, or percentage to total mg. It also shows you the THC per gram or milliliter, giving you a precise breakdown for any product type.
Whether you’re working with cannabis flower, cannabutter, tincture, oil, or homemade edibles, you get an accurate, reliable result in one click.
Key Features & Capabilities
- Two-way conversion — Switch between “Find Percentage (%)” and “Find Total mg” with one tap
- Three unit options — Supports grams (g), milliliters (ml), and ounces (oz)
- Instant results — No submit button needed; results update automatically
- Full breakdown — Displays Total THC (mg), THC Percentage, and THC per g/ml
- Works for all product types — Cannabis flower, edibles, cannabutter, tincture, cannabis oil, vaporizer oil, capsules, and concentrates
- CBD compatible — Use the same method for CBD milligram and percentage conversions
- 100% free — No account, no paywall, no ads tracking your session
- Mobile-friendly — Works on any device, anywhere
How to Use the THC mg ⇌ Percentage Calculator (Step-by-Step)
The tool has two modes. Choose the one that matches what you already know.
Mode 1 — Find Total mg (you know the weight and THC%)
- Click the “Find Total mg” tab at the top of the calculator.
- Enter your Product Weight or Volume in the left field (e.g., 20).
- Select your unit from the dropdown on the right: grams (g), ml (liquid), or ounces (oz).
- Enter the THC Percentage (%) in the second field (e.g., 10).
- Your results appear instantly below:
- Total THC (mg) — the full milligram count in your product
- THC Percentage — confirmed percentage
- THC per g/ml — potency per unit weight or volume
Example: A 20g product at 10% THC contains 2,000.00 mg of THC, with 100 mg per gram.
Mode 2 — Find Percentage (you know the weight and total mg)
- Click the “Find Percentage (%)” tab at the top.
- Enter your Product Weight or Volume (e.g., 20).
- Select your unit — grams (g), ml (liquid), or ounces (oz).
- Enter the Total THC (mg) you have (e.g., 10).
- Results display instantly:
- THC Percentage — the potency as a percentage
- Total THC (mg) — confirmed milligram total
- THC per g/ml — mg per unit weight/volume
Example: 10 mg of THC in a 20g product equals 0.05% THC, at 0.500 mg per gram.
Note: For liquid products, 1 milliliter (ml) is approximated as 1 gram for standard conversion. Actual density may vary slightly by formulation.
THC mg to Percentage Quick Reference Table
Use this table as a fast reference for common cannabis products and doses.
| Product Weight | THC Percentage | Total THC (mg) | THC per gram |
|---|---|---|---|
| 1g flower | 20% | 200 mg | 200 mg/g |
| 3.5g (⅛ oz) flower | 20% | 700 mg | 200 mg/g |
| 10g cannabutter | 15% | 1,500 mg | 150 mg/g |
| 30ml tincture | 3.33% | 1,000 mg | 33.3 mg/ml |
| 100ml cannabis oil | 5% | 5,000 mg | 50 mg/ml |
| 50g edible batch | 10% | 5,000 mg | 100 mg/g |
Beginner tip: Start low. A safe starting dose is 5–10 mg of THC. Wait at least 2 hours before taking more, especially with edibles.
Accuracy & Privacy Guarantee
This calculator uses verified potency formulas used across the legal cannabis industry.
The math is simple and transparent:
- Total THC (mg) = Weight (g) × THC% × 10
- THC% = (Total mg ÷ Weight) ÷ 10
The tool runs entirely in your browser. No data is sent to any server. Your inputs stay private. There is no login, no tracking, and no charge — ever.
Results update in real time. There is no rounding shortcut. Every figure you see reflects exact calculation.
FREQUENTLY ASKED QUESTIONS (FAQ)
What is the formula to convert THC percentage to milligrams?
Multiply the product weight in grams by the THC percentage, then multiply by 10 to get total milligrams. For example, a 5g edible at 20% THC contains 1,000 mg of THC. This formula applies to flower, cannabutter, oils, tinctures, and any infusion.
Can I use this calculator for CBD products too?
Yes, this calculator works for any cannabinoid, including CBD — just enter the CBD percentage or milligrams the same way you would for THC. The formula for potency calculation is identical whether you are calculating THC, CBD, or any other compound. Use it for tinctures, capsules, oils, or homemade cannabis edibles.
Does the calculator work for liquid products like tinctures and cannabis oil?
Yes, select “ml (liquid)” from the unit dropdown and enter your volume in milliliters. The calculator approximates 1 ml as 1 gram for standard conversion purposes. Actual density may vary slightly by formulation, so results are estimates for liquids with non-standard density.
How many mg of THC is a good dose for a beginner?
A beginner dose is typically 2.5–5 mg of THC per serving for edibles. Start low and wait at least 2 hours before taking more, as edible absorption is slower than inhalation. Use this calculator to find exactly how much THC is in each serving of your homemade edibles or cannabis oil batch before consuming.