diff --git a/frontend/src/components/editor/Step3FinalGraph.jsx b/frontend/src/components/editor/Step3FinalGraph.jsx
index 8e344f9..4a8fcbd 100644
--- a/frontend/src/components/editor/Step3FinalGraph.jsx
+++ b/frontend/src/components/editor/Step3FinalGraph.jsx
@@ -2,6 +2,7 @@ import React, { useState, useEffect, memo } from 'react';
 import { ComposedChart, Area, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts';
 import { useGraphData } from './finalGraph/useGraphData';
 import { GraphTooltip } from './finalGraph/GraphTooltip';
+import { MembershipEvaluator } from './finalGraph/MembershipEvaluator';
 
 const Step3FinalGraph = memo(({ data, criterionName }) => {
   const { sortedResults, denseData } = useGraphData(data);
@@ -19,15 +20,15 @@ const Step3FinalGraph = memo(({ data, criterionName }) => {
   }
 
   return (
-    <div className="w-full h-[550px] bg-white p-6 rounded-2xl shadow-sm border border-slate-200 flex flex-col final-graph-container relative">
+    <div className="w-full bg-white p-6 rounded-2xl shadow-sm border border-slate-200 flex flex-col final-graph-container relative">
       <style>{`.final-graph-container svg * { clip-path: none !important; }`}</style>
-      
-      <h3 className="text-xl font-bold mb-4 text-center text-slate-800 uppercase">
+
+      <h3 className="text-xl font-bold mb-4 text-center text-slate-800 uppercase shrink-0">
         {criterionName ? `Criterio: ${criterionName}` : 'Espectro Difuso Final'}
       </h3>
-      
-      <div className="flex-1 w-full min-h-[400px] relative">
-        
+
+      <div className="w-full h-[400px] relative shrink-0">
+
         {!isReady && (
           <div className="absolute inset-0 flex flex-col items-center justify-center">
             <div className="w-8 h-8 border-4 border-slate-200 border-t-blue-500 rounded-full animate-spin mb-3"></div>
@@ -35,28 +36,25 @@ const Step3FinalGraph = memo(({ data, criterionName }) => {
           </div>
         )}
 
-        {/* Gráfica */}
         <div className={`absolute inset-0 transition-opacity duration-700 ease-in-out ${isReady ? 'opacity-100' : 'opacity-0'}`}>
           {isReady && (
             <ResponsiveContainer width="100%" height="100%">
               <ComposedChart data={denseData} margin={{ top: 15, right: 50, left: 10, bottom: 10 }}>
                 <CartesianGrid strokeDasharray="3 3" opacity={0.5} vertical={false} />
-                <XAxis 
+                <XAxis
                   dataKey="x" type="number" domain={[0, 1]} allowDataOverflow={true}
-                  ticks={[0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1]} 
-                  tick={{ fill: '#475569', fontWeight: 600, fontSize: 14 }} 
+                  ticks={[0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1]}
+                  tick={{ fill: '#475569', fontWeight: 600, fontSize: 14 }}
                 />
-                <YAxis 
-                  domain={[0, 1]} tickCount={6} tickFormatter={(val) => Number(val.toFixed(2))} 
-                  tick={{ fill: '#475569', fontSize: 14 }} 
+                <YAxis
+                  domain={[0, 1]} tickCount={6} tickFormatter={(val) => Number(val.toFixed(2))}
+                  tick={{ fill: '#475569', fontSize: 14 }}
                 />
-                
-                <Tooltip 
-                  content={<GraphTooltip sortedResults={sortedResults} />} 
-                  cursor={{ stroke: '#cbd5e1', strokeWidth: 1, strokeDasharray: '5 5' }} 
+                <Tooltip
+                  content={<GraphTooltip sortedResults={sortedResults} />}
+                  cursor={{ stroke: '#cbd5e1', strokeWidth: 1, strokeDasharray: '5 5' }}
                   isAnimationActive={false}
                 />
-
                 {sortedResults.map((item) => (
                   <React.Fragment key={item.term}>
                     {item.isType2 ? (
@@ -76,8 +74,8 @@ const Step3FinalGraph = memo(({ data, criterionName }) => {
         </div>
       </div>
 
-      {/* Leyenda */}
-      <div className="flex flex-wrap justify-center gap-x-8 gap-y-3 mt-6 pb-2 relative z-10">
+      {/* Legend */}
+      <div className="flex flex-wrap justify-center gap-x-8 gap-y-3 mt-5 relative z-10 shrink-0">
         {sortedResults.map((item) => (
           <div key={`legend-${item.term}`} className="flex items-center gap-2">
             <span className="w-3.5 h-3.5 rounded-full shadow-sm" style={{ backgroundColor: item.color }} />
@@ -85,6 +83,13 @@ const Step3FinalGraph = memo(({ data, criterionName }) => {
           </div>
         ))}
       </div>
+
+      {/* Evaluador Manual */}
+      {isReady && sortedResults.length > 0 && (
+        <div className="mt-4 pt-4 border-t border-slate-100 relative z-10 pl-[60px]">
+          <MembershipEvaluator sortedResults={sortedResults} />
+        </div>
+      )}
     </div>
   );
 });
diff --git a/frontend/src/components/editor/finalGraph/MembershipEvaluator.jsx b/frontend/src/components/editor/finalGraph/MembershipEvaluator.jsx
new file mode 100644
index 0000000..c41f75e
--- /dev/null
+++ b/frontend/src/components/editor/finalGraph/MembershipEvaluator.jsx
@@ -0,0 +1,115 @@
+import { useState } from 'react';
+import { interpolateY } from './useGraphData';
+
+const evaluateMembership = (x, sortedResults) => {
+  if (!sortedResults || sortedResults.length === 0) return [];
+  return sortedResults.map(item => {
+    if (item.isType2) {
+      const lower = interpolateY(x, item.lowerNodes) ?? 0;
+      const upper = interpolateY(x, item.upperNodes) ?? 0;
+      return { term: item.term, color: item.color, isType2: true, lower, upper };
+    }
+    const y = interpolateY(x, item.nodes) ?? 0;
+    return { term: item.term, color: item.color, isType2: false, y };
+  });
+};
+
+const filterActive = (results) =>
+  results.filter(r => r.isType2 ? r.upper > 0 : r.y > 0);
+
+const TermResult = ({ result }) => {
+  const uncertainty = result.isType2 ? Math.abs(result.upper - result.lower) : 0;
+  const isSimple = !result.isType2 || uncertainty <= 0.001;
+  const displayY = result.isType2 ? result.upper : result.y;
+
+  return (
+    <div className="flex flex-col text-xs font-medium bg-slate-50 p-2.5 rounded-xl border border-slate-100">
+      <span className="uppercase font-black mb-1.5" style={{ color: result.color }}>
+        {result.term}
+      </span>
+      {isSimple ? (
+        <span className="text-slate-600 flex justify-between gap-4">
+          Pertenencia: <b>{displayY.toFixed(3)}</b>
+        </span>
+      ) : (
+        <>
+          <span className="text-slate-600 flex justify-between gap-4">
+            Mínimo: <b>{result.lower.toFixed(3)}</b>
+          </span>
+          <span className="text-slate-600 flex justify-between gap-4 mt-0.5">
+            Máximo: <b>{result.upper.toFixed(3)}</b>
+          </span>
+          <span className="text-slate-500 font-bold mt-1.5 pt-1.5 border-t border-slate-200 flex justify-between gap-4">
+            Incertidumbre: <span>{uncertainty.toFixed(3)}</span>
+          </span>
+        </>
+      )}
+    </div>
+  );
+};
+
+export const MembershipEvaluator = ({ sortedResults }) => {
+  const [inputValue, setInputValue] = useState('');
+
+  const handleChange = (e) => {
+    const raw = e.target.value;
+    if (raw === '') { setInputValue(''); return; }
+    const dotIdx = raw.indexOf('.');
+    if (dotIdx !== -1 && raw.length - dotIdx - 1 > 4) {
+      setInputValue(raw.slice(0, dotIdx + 5));
+    } else {
+      setInputValue(raw);
+    }
+  };
+
+  const trimmed = inputValue.trim();
+  const xNum = trimmed === '' ? null : parseFloat(trimmed);
+  const isValidNumber = xNum !== null && !isNaN(xNum) && isFinite(xNum);
+
+  const activeResults = isValidNumber
+    ? filterActive(evaluateMembership(xNum, sortedResults))
+    : null;
+
+  return (
+    <div className="flex items-center gap-4 flex-wrap">
+      {/* Input group */}
+      <div className="flex items-center gap-2 shrink-0">
+        <label
+          htmlFor="eval-x-input"
+          className="text-xs font-bold uppercase tracking-wider text-slate-400 whitespace-nowrap"
+        >
+          Evaluar X:
+        </label>
+        <input
+          id="eval-x-input"
+          type="number"
+          step="0.0001"
+          value={inputValue}
+          onChange={handleChange}
+          placeholder="ej. 0.35"
+          className="w-28 px-2.5 py-1.5 border border-slate-300 rounded-lg text-sm font-mono text-slate-800 focus:outline-none focus:ring-2 focus:ring-blue-400 focus:border-blue-400 transition-shadow placeholder:text-slate-400"
+        />
+      </div>
+
+      {/* Results */}
+      <div className="flex flex-row flex-wrap gap-3 items-center">
+        {trimmed === '' && (
+          <span className="text-xs text-slate-400 italic">
+            Introduce un valor para obtener el grado de pertenencia.
+          </span>
+        )}
+        {trimmed !== '' && !isValidNumber && (
+          <span className="text-xs text-red-400 italic">Valor no válido.</span>
+        )}
+        {isValidNumber && activeResults.length === 0 && (
+          <span className="text-xs text-slate-400 italic">
+            Ningún término activo en X = {xNum.toFixed(4)}.
+          </span>
+        )}
+        {isValidNumber && activeResults.map(r => (
+          <TermResult key={r.term} result={r} />
+        ))}
+      </div>
+    </div>
+  );
+};
diff --git a/frontend/src/components/editor/finalGraph/useGraphData.js b/frontend/src/components/editor/finalGraph/useGraphData.js
index 408cdfc..965c133 100644
--- a/frontend/src/components/editor/finalGraph/useGraphData.js
+++ b/frontend/src/components/editor/finalGraph/useGraphData.js
@@ -1,7 +1,7 @@
 import { useMemo } from 'react';
 import { CHART_COLORS } from '../../../config';
 
-const interpolateY = (x, nodes) => {
+export const interpolateY = (x, nodes) => {
   if (!nodes || nodes.length === 0) return null;
   const EPSILON = 1e-5;
   const MICRO_STEP = 0.0001;