Private, on-device planning

Plan caffeine around your sleep

Test a drink before you have it, work backwards from bedtime, compare alternatives, or keep a private daily log. These are mathematical estimates, not medical or sleep-safety decisions.

BedtimeHalf-life estimate

Decision tool

Can I drink this now?

See how much this additional drink contributes at your planned bedtime.

Choose a common drink

Drink nameCaffeine (mg)Drink time

Enter a dose from 0 to 1,000 mg, a half-life from 1 to 12 hours and a bedtime after the drink.

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Make a planned routine easier to repeat

Optional brewing and carrying equipment, separate from your private tracker data and calculated results.

As an Amazon Associate I earn from qualifying purchases. How paid links work.

AdHario V60 drip coffee scale and timer · blackFor repeating coffee and water weights and brew time. A scale measures mass, not caffeine; it can’t tell us a drink’s milligram dose.View product and current reviews on Amazon UK
AdContigo West Loop AUTOSEAL travel mug · 470 mlAn optional reusable cup for a coffee run. Check café acceptance and serving capacity; a mug’s capacity doesn’t determine caffeine content.View product and current reviews on Amazon UK
AdTaylors of Harrogate Decaffé ground coffee · 6 × 200 gGround coffee for a lower-caffeine home brew, not a café recipe or capsule refill. This listing is a multipack; check quantity and brewing compatibility.View product and current reviews on Amazon UK

Selections checked 24 October 2026. Ratings, availability and product details can change. Check the current reviews, exact variant, ingredients and pack size on Amazon before buying. No Amazon stars, prices or customer reviews are reproduced here.