Single-serve pod (K-Cup) vs Instant coffee: caffeine compared
Single-serve pod (K-Cup) (8 oz) has 90 mg of caffeine, 28 mg more than Instant coffee (8 oz, 62 mg) — 1.5× as much per serving. Per fluid ounce, Single-serve pod (K-Cup) is the stronger drink: 11.2 mg/oz versus 7.8 mg/oz.
| Single-serve pod (K-Cup) | Instant coffee | |
|---|---|---|
| Serving | 8 oz | 8 oz |
| Caffeine per serving | 90 mg | 62 mg |
| Per fl oz | 11.2 mg | 7.8 mg |
| Share of 400 mg/day | 22% | 16% |
| Servings to reach 400 mg | 4.4 | 6.5 |
| Hours until under 50 mg | 4.2 h | 1.6 h |
| Last one for an 11 PM bedtime · standard (50 mg) | 6:46 PM | 9:27 PM |
| Last one for an 11 PM bedtime · sensitive (25 mg) | 1:46 PM | 4:27 PM |
| Share of the 200 mg pregnancy limit | 45% | 31% |
One serving of each, over 16 hours
Common questions
Which has more caffeine, Single-serve pod (K-Cup) or Instant coffee?
Single-serve pod (K-Cup) (8 oz) has about 90 mg versus 62 mg in Instant coffee (8 oz): 28 mg more, or 1.5× as much.
Which is stronger per ounce, Single-serve pod (K-Cup) or Instant coffee?
Single-serve pod (K-Cup): about 11.2 mg per fl oz versus 7.8 mg for Instant coffee. Serving size decides the total you actually drink.
How many Instant coffee servings equal one Single-serve pod (K-Cup)?
About 1.5 servings of Instant coffee (8 oz) match the caffeine in one Single-serve pod (K-Cup) (8 oz).
When should I stop drinking Single-serve pod (K-Cup) or Instant coffee before bed?
For an 11 PM bedtime with a 50 mg limit and a 5-hour half-life: last Single-serve pod (K-Cup) by 6:46 PM, last Instant coffee by 9:27 PM. Half-life varies from about 1.5 to 9.5 hours between people.
Method
Caffeine per labeled serving, from the same drink table every calculator here uses (FDA/USDA reference amounts and manufacturer labels; see caffeine content of every drink). Brewed drinks vary batch to batch, so read these as typical values. Decay uses a 5-hour average half-life with a 45-minute absorption ramp; cutoff = bedtime − 5 h × log₂(dose ÷ limit). Percentages use the FDA's 400 mg/day figure for healthy adults and the 200 mg/day limit ACOG gives for pregnancy.
Source — Single-serve pod (K-Cup): CSPI caffeine chart (Keurig K-Cup, most varieties), checked 2026-10-13. 75–150 mg per pod (8 oz). Published range 75–150 mg.
Source — Instant coffee: USDA FoodData Central (SR Legacy 174130), checked 2026-10-13. 26 mg per 100 g × 237 g.