Who runs this
caniworkoutyet.com is published by Red Goggles LLC, an independent operator of free, single-purpose web tools. We are not a gym, a clinic, a medical provider, a supplement seller, or a food brand, and we are not affiliated with any of them. We don’t sell anything, we don’t ask you to make an account, and we don’t collect the meal or workout details you enter — the calculator runs entirely in your browser and nothing you type is sent to us.
Why this tool exists
Search “how long to wait after eating before working out” and every result gives you the same flat band: 30 minutes for a snack, one to two hours for a meal, three to four after a big one. That’s a table, not an answer. It ignores the two things that actually move the number — how much fat was in the meal (the single biggest brake on how fast your stomach clears) and how hard you’re about to train. This tool takes your specific calories, fat, protein, meal type, and intensity and returns one number you can set a timer to.
How it’s calculated
The estimate is anchored to published gastric emptying half-time (T½) data — the minutes it takes for half a meal to leave the stomach, measured by scintigraphy — and to the well-established physiology of what slows that emptying:
- Baseline load from calories. A typical ~300 kcal mixed solid meal empties to half in roughly 70–95 minutes in the literature, and bigger meals take materially longer. That sets the size of our baseline term.
- Fat is the primary, dose-dependent brake. Fat is described in the literature as “a potent inhibitor of gastric emptying,” slowing it markedly and dose-dependently — so grams of fat carry the heaviest weight.
- Protein slows it too, but less, load-dependently — a lighter weight than fat.
- Liquids clear faster than solids, so a shake gets a discount versus an equivalent-calorie plate.
- Workout intensity raises the wait. The direction is accepted physiology (harder efforts divert blood from the gut and raise cramp/reflux risk); the size of our intensity adjustment is an editorial choice with a physiological rationale, not a measured constant — and we say so.
The full formula, every figure, and the primary sources are laid out on the methodology page. Our editorial approach is simple: every physiological number printed on the site traces to a cited source, and anything we chose ourselves is flagged as editorial. We show a range, not just a point, and we frame the number as the earliest you’re likely to feel ready — never a green light to push through symptoms.
How the site is funded
caniworkoutyet.com is free and supported by display advertising. Advertising is kept calm and never mixes with your inputs — see our privacy page for exactly what is and isn’t collected.
An estimate — not medical advice. This tool gives a comfort-and-performance estimate, not a physiological all-clear and not a diagnosis. If you have GERD/reflux, diabetes, gastroparesis, or any GI condition, please talk to a clinician rather than a generic timer. See our full disclaimer.
Questions or a correction to the method? We take the sourcing seriously — reach us on the contact page.