● Cycle planner

STEROID CYCLE CALCULATOR.

Map serum-decay curves for every Blackbird Pharma compound on one graph. Pick a product, set your dose, frequency and cycle window — the simulator stacks first-order pharmacokinetic curves so you can see active drug remaining over time. When the plan looks right, the calculator translates total milligrams into the exact number of vials and capsule packs you need, and drops them into your cart in one click.

● Compounds

Add a compound to start planning your cycle.

● Serum projection

Active drug remaining (mg)

Pick start & end dates on to render the curve.
Scroll horizontally to see the rest of the cycle

Curves show active drug remaining in the body (mg), summed across all doses via single-compartment exponential decay using each compound's advertised half-life. Absorption is treated as instantaneous and bioavailability is not applied — this is a pharmacokinetic shape, not a clinical ng/mL reading. For real serum measurements, order bloodwork through a licensed clinic.

● Cycle requirements
ProductDosesTotal mgPer unitUnits neededSubtotal
Cycle total

Build a cycle above to see the products and quantities you'll need.

View cart →
● Export the schedule

Printable calendar

Generates a clean month-by-month calendar with every dose marked on the correct day, ready to print or save as PDF from the browser's print dialog.

Import to Google / Apple / Outlook calendar

Downloads a standard .ics file with one event per dose. Open it in Google Calendar, Apple Calendar, Outlook, Thunderbird, Proton Calendar — any app that supports iCalendar — and every dose lands on your phone with a reminder.

Google Calendar: open Settings → Import & export → Import and pick the downloaded file. Apple Calendar: double-click to import. Outlook: File → Open & Export → Import/Export → iCalendar.

Online steroid cycle calculator — pharmacokinetic graph for testosterone, trenbolone, nandrolone, boldenone, oxandrolone & more

Blackbird Pharma ships pharmaceutical-grade anabolic steroids manufactured inside the European Union with an independent EU laboratory certificate of analysis on file for every active SKU. The cycle planner above lets you simulate the blood-serum concentration profile of any product in our catalogue — testosterone enanthate, testosterone cypionate, testosterone propionate, testosterone undecanoate, trenbolone acetate, trenbolone enanthate, nandrolone decanoate, nandrolone phenylpropionate, boldenone undecylenate, drostanolone propionate, methenolone enanthate (primobolan), oxandrolone (anavar), methandienone (dianabol), oxymetholone (anadrol), stanozolol (winstrol), 4-chlorodehydromethyltestosterone (turinabol), tamoxifen citrate, clomiphene citrate and anastrozole.

Each curve is computed from the advertised pharmaceutical half-life of the compound (not from the lab batch measurement), assuming instant absorption and single-compartment first-order elimination. Stack multiple compounds on one chart to plan a blast-and-cruise testosterone cycle, a contest-prep recomp run, or a PCT schedule built around tamoxifen and clomiphene. The y-axis reports milligrams of active drug remaining in the body, which preserves the correct peak-and-decay shape without inventing a fictional ng/mL clinical value.

Once your plan is set, the calculator translates total milligrams into the exact number of vials or capsule packs needed to complete the cycle, using the published concentration and pack size of every Blackbird Pharma product. Click Add cycle to cart to drop the whole stack into your basket and check out with crypto (BTC, ETH, USDT-TRC20) or SEPA bank transfer. Discreet, tracked shipping ships from the EU to anywhere we can legally deliver, and orders above €250 qualify for free worldwide shipping.

How to use the cycle planner

  1. Add a compound — pick the exact product from our shop, set the dose per injection (or per capsule), choose how often you inject (or take orally), and pin the cycle's start + end date.
  2. Stack more compounds — repeat for every ester or oral in your cycle. The simulator overlays all curves on the same time axis so the relationship between, say, testosterone enanthate (~7 day half-life) and trenbolone acetate (~3 day half-life) is visible at a glance.
  3. Switch the resolution — view the simulation hourly, daily or weekly depending on the cycle length and the half-life of the compounds in play.
  4. Order the cycle — review the requirements table for the exact units needed and the cycle total, then send the whole stack to checkout with one click.

Disclaimer

This planner is provided as a pharmacokinetic visualisation tool for educational purposes only. It is not a medical device and the curves are not a clinical reading. Blackbird Pharma does not provide medical advice. Always consult a qualified medical professional before starting any pharmaceutical regimen and order bloodwork through a licensed laboratory.