Calc420 got a visual refresh. Same math, more tools, still 100% free.
Hey Reddit - I'm the person behind Calc420 (https://calc420.com).
A while back I posted about building it after Scientific Edibles went offline. I just spent a stretch making the site actually feel like a 2026 tool instead of a pile of calculators in a 2022 green template - and I added a bunch of things people kept asking for.
WHY I'M POSTING THIS
People actually use this thing to dose homemade edibles. If the UI is confusing, people guess — and guessing mg is how you have a bad night.
So the refresh is visual only: same formulas, same client-side calculator, same shareable recipe links. Just easier to read, easier to scan the result.
WHAT CHANGED VISUALLY
The whole site now shares one look:
- Colors
- Results that actually show the dose - charts next to the mg numbers, not just a wall of text
- Cleaner inputs
If you used it last year, the calculator is in the same place. It just doesn't look like a school project anymore.
WHAT'S NEW ON THE SITE
The original tools are still there:
Edible Dosage Calculator - https://calc420.com/
Magic Mushroom / Truffle Dosage - https://calc420.com/shrooms.html
Yield / Grow Light Calculator - https://calc420.com/yield.html
New calculators people asked for:
AVB / already-vaped bud - leftover THC from how dark the AVB is
https://calc420.com/avb-calculator.html
Edible onset & duration - when it kicks in / peaks / fades (gummies, baked, tincture, drinks)
https://calc420.com/edible-onset-calculator.html
THC gummy dosage - target mg per gummy → how much flower you need
https://calc420.com/gummy-dosage-calculator.html
Also: tincture, flower-to-oil ratio, RSO, CBD-only, THC mg↔%, grow-room electricity / cost per gram, plus the decarb and cannabutter-ratio tools.
A few practical guides too (labeling homemade edibles, storing cannabutter, what to do with dab reclaim, etc.).
WHAT DIDN'T CHANGE
- 100% in your browser. Inputs aren't sent to a server to calculate.
- Shareable recipe links via URL (bookmark or send a friend the exact setup).
- English + Spanish, German, Italian, French, Portuguese.
- No signup. No paywall. No ads.
If something feels off or something’s missing, there’s a feedback form in the nav - or just shoot me a DM. Criticism in the comments is totally welcome, but if you just comment without giving any useful feedback, it doesn’t really help. That’s the whole point of posting this: people here actually build this stuff, and I’d rather build something you’ll use than guess what you want.
