ETG Detection Time Chart: Hour-by-Hour Cutoff Estimate

That's the classic exponential decay pattern. EtG levels drop rapidly at first (when levels are high), then slow down as you approach the cutoffs. Think of it like a ball rolling down a hill — it starts fast and gradually slows. The chart is capped at 1,500 ng/mL to focus on the range that matters most: where you'll cross the test thresholds.

Most workplace drug tests use 500 ng/mL — that's the 'standard' cutoff shown in gray. Probation, court-ordered testing, and zero-tolerance programs often use 100 ng/mL — that's the 'strict' cutoff shown in red. If you're unsure, ask the testing administrator or lab which cutoff applies.

This chart shows averages based on medical research, but your body might be faster or slower. Factors like liver health, body weight, hydration, and genetics all play a role. For testing consequences, use the chart as context and discuss your situation with the testing program, lab, healthcare provider, or legal professional.

Yes! The faded lines in the background show 2, 4, 8, and 12 drink scenarios. Your current selection is the bold line. This helps you see how drinking more dramatically extends your detection window — 4 drinks doesn't just double the time from 2 drinks, it adds many more hours.

The 3-hour half-life is a conservative average from medical studies. Some research shows 2-3 hours, others up to 4 hours for certain people. We use 3 hours because it's middle-ground and matches what many lab discussions assume. Individual variation can be significant, so the chart should be read as a model.

Many people believe that drinking gallons of water will 'flush' EtG out of their system faster. This is a myth. Water consumption does not speed up your body's metabolic breakdown of EtG. It only dilutes your urine. While this might temporarily lower the concentration of EtG (ng/mL) in a single sample, it creates interpretation problems. Modern labs routinely check for creatinine levels and specific gravity. If your sample is too diluted (watery), it may be flagged as 'dilute' or 'invalid' depending on the program. ETG levels mainly decline through natural metabolism over time.

The term '80-hour test' is largely a marketing slogan that has caused a lot of unnecessary panic. While it is technically possible for EtG to be detected up to 80 hours (or roughly 3.5 days) after drinking, this typically only applies to extreme cases of chronic, heavy binge drinking. For many moderate-drinking scenarios, the detection window is significantly shorter — often between 24 and 48 hours. As you can see on the chart, the model often falls below the standard 500ng cutoff well before the 3-day mark. However, because biological outliers exist, the 80-hour window is used as a maximum warning, not a guaranteed detection period for every single drink.

This calculator uses a standard 3-hour half-life, which is a common medical average. However, you are a unique individual, not a statistic. Several biological factors can shift your personal timeline: Liver Health — A healthy liver processes alcohol significantly faster than a damaged or fatty liver. Metabolism — People with naturally faster metabolic rates may reduce ETG faster. Body Composition — Your weight and body fat percentage affect your initial peak levels. Frequency of Drinking — Chronic daily drinkers may process alcohol differently than occasional social drinkers. Age — Metabolism generally slows down as we get older. Because of these personal variables, the chart cannot guarantee a real test result.