⚖️ Body Weight Dose Calculator
Calculate your personalised total dose from a per-kilogram protocol. Supports kg and lbs with automatic conversion.
Weight-Based Peptide Dosing
Some peptides — most notably BPC-157 and TB-500 — are referenced in pre-clinical literature with per-kilogram dose rates, reflecting how animal study data is presented. This calculator converts a mcg/kg rate to a total dose for any body weight, with automatic pounds-to-kilograms conversion.
Important caveat: Animal-study dose rates are not directly scalable to humans. Many published pre-clinical protocols use dose rates of 100–1,000 mcg/kg that are far higher than effective human research doses. Use this calculator when a specific protocol explicitly states a per-kg rate, not as a universal dosing tool. Check the Peptide Reference Table for flat-dose protocols.
A researcher weighing 185 lbs following a 10 mcg/kg BPC-157 protocol.
- Select lbs and enter 185
- 185 lbs × 0.453592 = 83.9 kg
- 83.9 kg × 10 mcg/kg = 839 mcg total dose
- Table shows Low (5 mcg/kg = 419 mcg) through High (20 mcg/kg = 1,677 mcg)
Body Weight Dose Calculator
Enter your weight and the per-kilogram dose rate from your protocol.
| Protocol level | mcg / kg | Your dose |
|---|
Your selected rate is highlighted. Note that not all peptides use weight-based dosing — see the Peptide Reference table for standard flat-dose protocols.
Body Weight Dosing — Frequently Asked Questions
Which peptides actually use weight-based dosing?
Most practical peptide protocols use fixed flat doses, not weight-based dosing. The exception is when translating directly from pre-clinical animal studies that express doses in mcg/kg. BPC-157 and TB-500 are most commonly referenced with per-kg rates in the literature. Most other peptides (Ipamorelin, CJC-1295, PT-141, GLP-1 agonists) use flat doses that don't adjust for body weight in standard research protocols.
Should I use total body weight or lean mass?
Published pre-clinical research always uses total body weight since that is what is measured in animal studies. This calculator uses total body weight for consistency with the literature. Some practitioners argue lean body mass is more pharmacologically relevant (peptide distribution is primarily to lean tissue), but there is insufficient clinical data in humans to validate one approach over the other definitively.
My weight-based dose is much larger than flat-dose protocols — which is correct?
Pre-clinical animal doses are not directly scalable to humans using the same mcg/kg ratio. Animal studies often use 10–100× higher per-kg rates than effective human doses due to differences in metabolism, body composition, and pharmacokinetics. If weight-based calculation gives you a dose far outside established flat-dose ranges (e.g. BPC-157 flat dose: 250–1,000 mcg/day), default to the flat-dose protocol from the Peptide Reference table.