diff --git a/research/intents/aod-9604.json b/research/intents/aod-9604.json
index b665144..ed3e282 100644
--- a/research/intents/aod-9604.json
+++ b/research/intents/aod-9604.json
@@ -530,6 +530,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/ara-290.json b/research/intents/ara-290.json
index 0face7b..f39cc74 100644
--- a/research/intents/ara-290.json
+++ b/research/intents/ara-290.json
@@ -477,6 +477,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/bpc-157.json b/research/intents/bpc-157.json
index b30a685..b09945f 100644
--- a/research/intents/bpc-157.json
+++ b/research/intents/bpc-157.json
@@ -416,6 +416,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/cagrilintide.json b/research/intents/cagrilintide.json
index 8c1f6f8..ebebc5a 100644
--- a/research/intents/cagrilintide.json
+++ b/research/intents/cagrilintide.json
@@ -196,6 +196,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/dsip.json b/research/intents/dsip.json
index 4323ad8..c742bfc 100644
--- a/research/intents/dsip.json
+++ b/research/intents/dsip.json
@@ -397,6 +397,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/ghrp-6.json b/research/intents/ghrp-6.json
index 4855771..0cfa977 100644
--- a/research/intents/ghrp-6.json
+++ b/research/intents/ghrp-6.json
@@ -544,6 +544,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/humanin.json b/research/intents/humanin.json
index eed9be9..e27d614 100644
--- a/research/intents/humanin.json
+++ b/research/intents/humanin.json
@@ -463,6 +463,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/ipamorelin.json b/research/intents/ipamorelin.json
index 269120e..cd2efb0 100644
--- a/research/intents/ipamorelin.json
+++ b/research/intents/ipamorelin.json
@@ -304,6 +304,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/melanotan-ii.json b/research/intents/melanotan-ii.json
index 2db0058..f3fa55f 100644
--- a/research/intents/melanotan-ii.json
+++ b/research/intents/melanotan-ii.json
@@ -543,6 +543,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/mots-c.json b/research/intents/mots-c.json
index 7c5fb5c..e4a5168 100644
--- a/research/intents/mots-c.json
+++ b/research/intents/mots-c.json
@@ -209,6 +209,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/retatrutide.json b/research/intents/retatrutide.json
index 6731552..1a7e458 100644
--- a/research/intents/retatrutide.json
+++ b/research/intents/retatrutide.json
@@ -295,6 +295,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "escalation",
     "adverse",
     "who",
diff --git a/research/intents/selank.json b/research/intents/selank.json
index eb46891..c72a8fe 100644
--- a/research/intents/selank.json
+++ b/research/intents/selank.json
@@ -194,6 +194,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/semax.json b/research/intents/semax.json
index 63c3dd6..a11e956 100644
--- a/research/intents/semax.json
+++ b/research/intents/semax.json
@@ -209,6 +209,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/ss-31.json b/research/intents/ss-31.json
index d406129..6fd4a2a 100644
--- a/research/intents/ss-31.json
+++ b/research/intents/ss-31.json
@@ -484,6 +484,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/survodutide.json b/research/intents/survodutide.json
index 870c693..cacb67e 100644
--- a/research/intents/survodutide.json
+++ b/research/intents/survodutide.json
@@ -507,6 +507,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/tb-500.json b/research/intents/tb-500.json
index 2f6fb45..c3b6a7a 100644
--- a/research/intents/tb-500.json
+++ b/research/intents/tb-500.json
@@ -210,6 +210,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/tesamorelin.json b/research/intents/tesamorelin.json
index b4b53cb..58cf87c 100644
--- a/research/intents/tesamorelin.json
+++ b/research/intents/tesamorelin.json
@@ -241,6 +241,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/tesofensine.json b/research/intents/tesofensine.json
index 89f8e81..4fed07d 100644
--- a/research/intents/tesofensine.json
+++ b/research/intents/tesofensine.json
@@ -487,6 +487,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/research/intents/thymosin-alpha-1.json b/research/intents/thymosin-alpha-1.json
index 6a358d0..195bfd2 100644
--- a/research/intents/thymosin-alpha-1.json
+++ b/research/intents/thymosin-alpha-1.json
@@ -474,6 +474,7 @@
     "evidence",
     "doses",
     "dosage-chart",
+    "calculator",
     "adverse",
     "who",
     "biomarkers",
diff --git a/scripts/test_calculators.mjs b/scripts/test_calculators.mjs
index ea04e4e..b76fa51 100644
--- a/scripts/test_calculators.mjs
+++ b/scripts/test_calculators.mjs
@@ -139,6 +139,30 @@ if (fs.existsSync(CALC_DIR)) {
   }
 }
 
+// Each compound that has a calculator page also embeds the calculator on its
+// own record and links to the page. The two must agree: a calculator page with
+// no inbound link from its compound is an orphan, and a compound page whose
+// embedded tool does not compute is the same defect as the empty tools were.
+if (fs.existsSync(CALC_DIR)) {
+  for (const slug of fs.readdirSync(CALC_DIR, { withFileTypes: true }).filter((d) => d.isDirectory()).map((d) => d.name)) {
+    const file = path.join(DIST, 'compounds', slug, 'index.html');
+    if (!fs.existsSync(file)) { fails.push(`compounds/${slug}: no compound page for calculator page`); continue; }
+    const html = fs.readFileSync(file, 'utf8');
+    if (!html.includes(`href="/calculators/${slug}"`)) fails.push(`compounds/${slug}: no link to /calculators/${slug}`);
+    if (!/<section id="calculator">/.test(html)) { fails.push(`compounds/${slug}: no calculator section`); continue; }
+    if (!/id="r-out"/.test(html)) { fails.push(`compounds/${slug}: calculator section has no output element`); continue; }
+    const m = html.match(/<script type="module">([\s\S]*?)<\/script>/i);
+    if (!m) { fails.push(`compounds/${slug}: calculator present but no module script`); continue; }
+    const els = {};
+    for (const [id, v] of Object.entries({ 'r-mass': 5, 'r-vol': 2, 'r-want': 250, 'r-scale': 100 })) els[id] = { value: String(v), addEventListener() {} };
+    const out = { textContent: '' }; els['r-out'] = out;
+    globalThis.document = { getElementById: (id) => els[id] ?? null };
+    new Function(m[1])();
+    if (!out.textContent.includes('10 units on a U-100')) fails.push(`compounds/${slug}: embedded calculator did not compute`);
+    else pass++;
+  }
+}
+
 if (fails.length) {
   console.error(`calculator tests: ${pass} passed, ${fails.length} FAILED\n`);
   for (const f of fails) console.error(`  ${f}\n`);
diff --git a/src/components/Calculators.astro b/src/components/Calculators.astro
index 5aab7aa..f3d3c9b 100644
--- a/src/components/Calculators.astro
+++ b/src/components/Calculators.astro
@@ -8,12 +8,20 @@
 // Nothing here accepts a body weight, an age or a condition, and nothing
 // returns a dose. Each tool states its formula above the inputs, so the
 // arithmetic can be checked by hand.
-interface Props { slug: string }
-const { slug } = Astro.props;
+interface Props {
+  slug: string;
+  /** The reconstitution tool's section id and heading, overridable so the same
+   *  component can sit inside a compound page under that page's own H2. */
+  id?: string;
+  heading?: string;
+  headingLevel?: 2 | 3;
+}
+const { slug, id = 'calc-recon', heading = 'Work out concentration and what to draw', headingLevel = 2 } = Astro.props;
+const H = headingLevel === 3 ? 'h3' : 'h2';
 ---
 {slug === 'reconstitution-calculator' && (
-  <section id="calc-recon">
-    <h2>Work out concentration and what to draw</h2>
+  <section id={id}>
+    <H>{heading}</H>
     <p class="prose">Two divisions, both shown. <b>Concentration</b> = mass in the vial &divide; diluent volume. <b>Volume to draw</b> = mass you want &divide; that concentration. Syringe units are that volume &times; the units per millilitre on your syringe's own scale.</p>
     <form class="calc" onsubmit="return false">
       <label for="r-mass">Mass in vial (mg)</label>
diff --git a/src/layouts/CompoundV2.astro b/src/layouts/CompoundV2.astro
index 26fe909..d4796c8 100644
--- a/src/layouts/CompoundV2.astro
+++ b/src/layouts/CompoundV2.astro
@@ -28,6 +28,8 @@ import LandscapeTable from '../components/v2/LandscapeTable.astro';
 import HumanTrials from '../components/v2/HumanTrials.astro';
 import CombinationEvidence from '../components/v2/CombinationEvidence.astro';
 import EditorialSection from '../components/v2/EditorialSection.astro';
+import Calculators from '../components/Calculators.astro';
+import { qualifies as hasCalculator } from '../lib/calculators';
 import { entityLinker } from '../lib/entities';
 import ReconstitutionMath from '../components/shared/ReconstitutionMath.astro';
 import EquipmentInStudies from '../components/shared/EquipmentInStudies.astro';
@@ -120,7 +122,7 @@ const ledeFor = (f: string) => [boundaryFor(intent, f), defaultLedes[f]].filter(
 // claims but with mapped demand renders as an explicit absence statement.
 type Guide = { id: string; heading: string; lede?: string; html: string; pending?: boolean };
 const guide: Guide[] = ((d as any).guide ?? []) as Guide[];
-type Block = { id: string; kind: 'human' | 'table' | 'landscape' | 'claims' | 'absence' | 'method' | 'compare' | 'combination' | 'regulatory' | 'open' | 'faq' | 'guide'; field?: string; label: string; group: string; guide?: Guide };
+type Block = { id: string; kind: 'human' | 'table' | 'landscape' | 'claims' | 'absence' | 'method' | 'calculator' | 'compare' | 'combination' | 'regulatory' | 'open' | 'faq' | 'guide'; field?: string; label: string; group: string; guide?: Guide };
 // Links the first mention of each other record in this page's own prose.
 const linkEntities = entityLinker([d.slug], 10);
 const blocks: Block[] = [];
@@ -133,6 +135,11 @@ for (const [f, id, label] of evidence) {
   if (has(f)) blocks.push({ id, kind: 'claims', field: f, label: headingFor(intent, f, label), group: 'Evidence' });
   else if (queriesFor(intent, f).some((q) => q.policy !== 'redirect')) blocks.push({ id, kind: 'absence', field: f, label: headingFor(intent, f, label), group: 'Evidence' });
 }
+// The compound's own calculator, only where it has one: a record qualifies when
+// it is finished and carries at least two distinct published dose figures, the
+// same rule that decides whether /calculators/<slug> exists at all.
+const calculatorHere = hasCalculator(entry);
+if (calculatorHere) blocks.push({ id: 'calculator', kind: 'calculator', label: headingFor(intent, 'calculator', `${d.preferred_name} dosage calculator`), group: 'Evidence' });
 if (hasAnyEvidence) blocks.push({ id: 'method', kind: 'method', label: 'Method notes', group: 'Method' });
 if (peerEntries.length > 0) blocks.push({ id: 'compare', kind: 'compare', label: headingFor(intent, 'compare', 'Other compounds in its class'), group: 'Context' });
 if (inStacks.length > 0) blocks.push({ id: 'combination', kind: 'combination', label: headingFor(intent, 'combination', 'Studied in combination'), group: 'Context' });
@@ -228,6 +235,11 @@ const toc = [secs[0], secs[1], secs[2], ...tocBody, ...secs.filter((s) => ['sour
                 <EvidenceTable rows={A.evidence_table} />
               </section>
             );
+            case 'calculator': return (
+              <section id="calculator"><div><h2>{b.label}</h2><p class="lede">Enter a vial and a dose and it returns the concentration, the volume and the units on your syringe. It converts the numbers you give it and suggests none. The doses studies of {d.preferred_name} actually used, with a units chart per vial size, are on the <a href={`/calculators/${d.slug}`}>full {d.preferred_name} calculator page</a>.</p></div>
+                <Calculators slug="reconstitution-calculator" id="calculator-tool" heading="Work out concentration and what to draw" headingLevel={3} />
+              </section>
+            );
             case 'claims': return (
               <section id={b.id}><div><h2>{b.label}</h2><p class="lede">{ledeFor(b.field!)}</p></div><ClaimCards claims={A[b.field!]} sources={d.sources} />{b.field === 'weight_normalized_doses' && <WeightCaveat />}</section>
             );
@@ -260,8 +272,9 @@ const toc = [secs[0], secs[1], secs[2], ...tocBody, ...secs.filter((s) => ['sour
 
         {d.sources.length > 0 && <section id="sources"><div><h2>Sources</h2><p class="lede">Full citations. Every claim above links to one of these by its id.</p></div><Sources sources={d.sources} /></section>}
         <section id="card"><h2>Reference card</h2><RefCard record={d} reg={reg} path={path} /></section>
-        {(inStacks.length > 0 || inComparisons.length > 0 || peerEntries.length > 0) && (
+        {(inStacks.length > 0 || inComparisons.length > 0 || peerEntries.length > 0 || calculatorHere) && (
           <section id="related"><h2>Related records</h2><ul class="cards">
+            {calculatorHere && <li><a href={`/calculators/${d.slug}`}>{d.preferred_name} dosage calculator</a><div class="sub">Units, mg and reconstitution, with the doses studies used</div></li>}
             {peerEntries.map((p) => <li><a href={`/compounds/${p.data.slug}`}>{p.data.preferred_name}</a><div class="sub">Peer compound</div></li>)}
             {inStacks.map((s) => <li><a href={`/stacks/${s.slug}`}>{s.name}</a><div class="sub">Stack · wave {s.pilot_wave}</div></li>)}
             {inComparisons.map((c) => <li><a href={`/compare/${c.slug}`}>{c.sides.join(' vs ')}</a><div class="sub">Comparison · wave {c.pilot_wave}</div></li>)}