10 TB-500 Dosage Calculators Worth Bookmarking Right Now
Peptide calculators used to be an afterthought. A scattered spreadsheet here, a Reddit comment there. That changed in 2025 and early 2026, when several telehealth companies and independent developers shipped actual web tools built around the specific math of lyophilized peptides. The difference matters. Get the units wrong by a factor of 1,000 (mg versus mcg) and you are not off by a little. You are off by a lot.
This list covers ten tools, ranked by how well they handle the TB-500 workflow specifically: vial size entry, BAC water volume, syringe type, and output that tells you exactly where to draw on an insulin syringe.
1. FormBlends Peptide Calculator
The clearest reason this one sits at the top is that it shows you the math, not just an answer. Enter a 5 mg TB-500 vial, say you added 2 mL of bacteriostatic water, and tell it you want 500 mcg per injection. It outputs concentration per mL, units to draw on a U-100 syringe, and how many injections that vial holds. It also renders a small visual fill bar so you can see exactly where the plunger should land.
What separates it from most anonymous pages: it handles U-100, U-50, and U-40 syringes, converts mg to mcg automatically (a 1 mg = 1,000 mcg conversion that trips up a disproportionate number of first-timers), and includes one-tap presets for TB-500 5 mg, BPC-157 5 mg and 10 mg, ipamorelin, tesamorelin, and a GLP-1 50 mg option. The tool is free and does not ask for a login.
It is built by FormBlends, a company that also operates a 503A compounding pharmacy. That means there is an actual organization behind it rather than a domain registered in 2022 with no contact page. The same calculator lives inside the FormBlends iOS and Android app, which adds a 55-compound reference library, dose logging, and an injection-site rotation map for people managing ongoing protocols.
One honest note: the tool calculates how to measure a dose. The number you enter is yours to determine, ideally because a provider has already given it to you.
2. PeptideFox
Peptidefox.com covers more than 30 peptides and has one feature no other tool on this list matches: it optimizes the BAC water volume to produce the cleanest possible unit draw on a standard syringe. Fewer weird decimals. The visual reconstitution guide is a genuine addition for anyone new to the process.
3. PeptideDeck
Simple three-field interface. Enter mg in the vial, mL of water added, and target mcg per dose. It returns concentration and the draw volume in both mL and insulin units. Nothing fancy. Reliable arithmetic. Good for quick reference.
4. MyPeptideMatch
Free, no account. Covers TB-500, BPC-157, semaglutide, tirzepatide, and a broader injectable list that reflects how many people now combine healing peptides with GLP-1 class compounds. Useful if you need one tool to cover multiple protocols at once.
5. LeadWest Medical Calculator
Built around a clinical peptide list: retatrutide, BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, sermorelin, GHK-Cu. The fact that sermorelin and tesamorelin are both included suggests someone with actual clinical familiarity designed the compound list. Straightforward dose math output.
6. Outliyr Peptide Calculator
Covers BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, GHK-Cu, and GLP-1 class peptides. The Outliyr site sits inside a broader biohacking content ecosystem, so the calculator is one piece of a larger resource. Fine for the math; not specialized.
7. peptidereconstitutecalculator.com
Narrowly focused on BPC-157, which makes it less useful for TB-500 specifically. But the mcg-to-units conversion against a U-100 syringe is clean, and it is a good fallback reference for anyone who wants a second check on BPC-157 numbers. Single-peptide focus means fewer variables to misread.
8. Prime Peptides Calculator
Attached to a peptide supplier. The math works. Worth mentioning because it is one of the more visible tools in search results for reconstitution questions. Supplier-affiliated calculators are not inherently wrong, but you should know the context.
See also: Caller Legitimacy Review Covering 18005694879 and Activity
9. peptides.org Dosage Charts
Not a live calculator. Static reference charts. Useful for understanding typical dose ranges (TB-500 protocols commonly run 5 to 20 mg per week in split injections, BPC-157 often 250 to 500 mcg per dose) before you run the numbers in a real tool. Think of it as pre-flight context.
10. Manual Spreadsheet Method
Old-fashioned and still valid. The formula is: (target dose in mcg / total mcg in vial) times mL of BAC water added, times 100, equals units to draw on a U-100 syringe. A basic spreadsheet with this formula catches the same errors any web tool does. The downside is no visual check and no preset compounds. But if a website goes dark, this math still works.
Points That Apply to Every Tool on This List
Adding more BAC water to a vial does not change how much peptide is in it. It changes the concentration, which changes the units you draw to hit your dose. That distinction matters and every good calculator reflects it.
A U-100 syringe holds 100 units per full mL. Ten units equals 0.1 mL. The math is consistent regardless of peptide, which is why the reconstitution formula works identically for TB-500, BPC-157, or anything else that comes lyophilized in a vial.
Most of the tools on this list are anonymous web pages. That is not automatically disqualifying, but it is worth knowing when you decide how much you trust the output.
Common Questions
Does it matter which syringe type you select in a TB-500 calculator?
Yes, and the error compounds fast. A U-40 syringe and a U-100 syringe hold the same volume but mark it differently. If you enter U-100 into a calculator but draw from a U-40, your actual dose is 2.5 times higher than intended. Tools like FormBlends and PeptideFox both ask for syringe type explicitly for exactly this reason.
If I add more BAC water to my TB-500 vial than the calculator assumed, do I need to recalculate?
Every time. The peptide amount stays fixed, but concentration drops with every additional mL of water. A 5 mg vial reconstituted in 1 mL gives you 5,000 mcg per mL. Add 2 mL instead and that halves to 2,500 mcg per mL. Run the numbers again in whichever tool you use before drawing a dose.
Is the FormBlends calculator only useful if you buy from FormBlends?
No. The web tool and app are free and work with any vial, any peptide amount, and any water volume you enter. The FormBlends pharmacy connection matters mainly as a trust signal, confirming there is an accountable organization behind the tool, not as a prerequisite for using it.
Why does PeptideFox optimize BAC water volume when other calculators just accept whatever you enter?
Most calculators take your input and return a draw volume, which sometimes lands on an awkward decimal like 17.3 units. PeptideFox works backward from clean, readable unit values and suggests a BAC water volume that produces them. For TB-500, where doses often fall in the 500 to 2,500 mcg range, that small difference makes practical bench work noticeably easier.
Can these calculators tell me what TB-500 dose to take, or only how to measure one I already have?
Only the latter. Every tool on this list performs reconstitution math: given a vial size, water volume, and a dose you provide, they tell you how many units to draw. None of them prescribe a dose. The 5 to 20 mg per week range cited by peptides.org is a reference figure, not a recommendation, and a prescribing provider is the appropriate source for the actual number.
Sources
- U-100 insulin syringe standard: FDA device classification records and manufacturer labeling (Becton Dickinson, BD Ultra-Fine series)
- Lyophilized peptide reconstitution math: confirmed against USP general chapter guidelines on injectable preparation
- Peptide dose ranges: peptides.org published reference charts (publicly accessible, no login required)
- PeptideFox feature descriptions: peptidefox.com public tool interface
- FormBlends calculator features: FormBlends web tool and app store listing (public)
- LeadWest and Outliyr compound lists: respective public calculator pages