This is the original RoidCalc © 1998-2006 SmartLabs, Inc.

The Roid Calculator calculates the estimated blood level of different steroids, using half-lifes. The half-life is simply the time when 100 active milligrams breaks down to 50 active milligrams, to 25 active milligrams, and so on. The half-life may come after a few days, or a few hours, depending on the drug. You can use it to see how much active medicines you really have in your blood. Please remember that the results are only approximate. The half-lifes used below is based on several scientific studies.
Most of these studies used the glutes as injection site, if you inject in the delta muscle you will have much longer half-lives, try doubling all half-lives.

I have included a - 5% waste factor, because we dont live in a perfect world, and there will always be a little bit of loss when you inject steroids. On the orals I have included a -10% waste factor.
Here is the half-lifes, you can change the values if you want:

Testosterone propionate days
Testosterone phenylpropionate days
Testosterone isocaproate days
Testosterone decanoate days
Testosterone cypionate days
Testosterone entantate days
Nandrolone decanoate days
Drostanolonom propionate days
Metenolon enantate days
Boldenone undecylenate days

Note: Sustanon250 is based on this for each amp:
testosterone isocaproate 60mg
testosterone decanoate 100mg
testosterone propionate 30 mg
testosterone phenylpropionate 60mg

Note
:
Sustanon100 is based on this for each amp:
testosterone isocaproate 40mg
testosterone propionate 20 mg
testosterone phenylpropionate 40mg


Instructions
Enter the amount (in milligrams) per injectionday and then press Calculate. In the 'Total' column you will see the total mg of steroids in your blood, if you click in the 'View active' box and then 'Calculate' it will show you how much of the esters that have been released, and is 'active'. Press Clear if you want to set the values to zero. By default it will show 8 weeks (56 days) , you can change this value. It's also possible to change the half-lives if you want to use other numbers.

Injectables

View no. of weeks  
RoidCalc cookies
 Day 
Sustanon250/
Omnadren/
Durateston
Sustanon100
DecaDurabolin/
Extraboline
Testex-Prolang./
DepoTesto.
Testoviron/
Primoteston/
Testen
Primobolan
Virormone/
Testovis/
Testopin
Equipoise/
Ganabol/
Boldenon
View active
Total mg/day
Orals
Methandrostenolone hours
Stanozolol hours
User defined half life hours
HOUR Dianabol (mg)
Winstrol (mg)
User defined (mg)
Total mg per hour

Thanks to:
Bill Roberts for his knowledge
Andy from EliteFitness for his 'View active' suggestion
All PowerBoard members for their inspiration

References:
A pharmacokinetic study of injectable testosterone undecanoate in hypogonadal men J Androl 1998 Nov-Dec;19(6):761-8
Schulte-Beerbuhl M et al., Comparison of testosterone, dihydrotestosterone, luteinizing hormone, and follicle-stimulating hormone in serum after injection of testosterone enanthate or testosterone cypionate. Fertility and Sterility (1980) 33.2 : 201-203.
Chaudry, M.A.Q.; James, K.C.; et al. J. Pharm. Pharmac., 1976, 28, 882-885
Chaudry, M.A.Q.; James, K.C. J. Med. Chem., 1974, 17, 157-161
James, K.C.; Nicholls, P.J.; Roberts M. J. Pharm. Pharmac., 1969, 21, 24-27
Van der Vies, J. Acta Endocrinologica., 1985, 271, 38-44
United States Pharmacopeial Convention, USP DI: Drug Information for the Health Care Professional, 1993, 108. Rand McNally, Taunton Mass.
Weinbauer, G.F.; Jackwerth, B; et al. Acta Endocrinol. Copenh., 1990, 122, 432-42
Belkien, L.; Schurmeyer, T.; et al. J. Steroid Biochem., 1985, 22, 623-629
Metabolism of Anabolic Androgenic steroids. V. Rogozkin. 1991 CRC press
Metabolism of synthetic steroids. Fotherby K, James F. Adv. Steroid biochem pharmacol 1972 3: 67-165
Pharmacokinetic parameters of nandrolone (19-nortestosterone) after intramuscular administration of nandrolone decanoate to healthy volunteers. Wijnand, Bosch and Donker. Acta Endocrinol 1985 (suppl 271) 19-30
Implications of basic pharmacology in the therapy with esters of nandrolone. Acta endocrinol 1985 (suppl 271) 38-43
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