diff --git a/iframe.html b/iframe.html
index b370e17..877ee92 100644
--- a/iframe.html
+++ b/iframe.html
@@ -2202,7 +2202,8 @@ const CALCULATOR_CONFIG = {
                     energyUnit: 'kcal100g',
                     percentage: 0,
                     isLocked: false,
-                    chartType: null
+                    chartType: null,
+                    splitByMeals: false
                 };
                 this.foodSources.push(treats);
                 this.renderFoodSource(treats);
@@ -2654,6 +2655,11 @@ const CALCULATOR_CONFIG = {
                 const container = document.getElementById('foodSources');
                 if (!container) return;
 
+                const isChart = foodSource.chartType === 'gc' || foodSource.chartType === 'kibble';
+                const energyReadonlyAttr = isChart ? 'readonly' : '';
+                const energyTitle = isChart ? 'Chart-based food: kcal locked' : 'Enter energy content';
+                const unitDisabledAttr = isChart ? 'disabled' : '';
+
                 const cardHTML = `
                     <div class="dog-calculator-food-source-card" id="foodSource-${foodSource.id}">
                         <div class="dog-calculator-food-source-header">
@@ -2664,11 +2670,11 @@ const CALCULATOR_CONFIG = {
                         <div class="dog-calculator-input-group">
                             <div class="dog-calculator-form-group">
                                 <label for="energy-${foodSource.id}">Energy Content:</label>
-                                <input type="number" id="energy-${foodSource.id}" min="1" step="1" placeholder="Enter energy content" value="${foodSource.energy}">
+                                <input type="number" id="energy-${foodSource.id}" ${energyReadonlyAttr} title="${energyTitle}" min="1" step="1" placeholder="Enter energy content" value="${foodSource.energy}">
                             </div>
                             <div class="dog-calculator-form-group">
                                 <label for="energy-unit-${foodSource.id}">Unit:</label>
-                                <select id="energy-unit-${foodSource.id}" class="dog-calculator-unit-select">
+                                <select id="energy-unit-${foodSource.id}" class="dog-calculator-unit-select" ${unitDisabledAttr} title="${isChart ? 'Chart-based food: unit locked' : 'Select energy unit'}">
                                     <option value="kcal100g" ${foodSource.energyUnit === 'kcal100g' ? 'selected' : ''}>kcal/100g</option>
                                     <option value="kcalkg" ${foodSource.energyUnit === 'kcalkg' ? 'selected' : ''}>kcal/kg</option>
                                     <option value="kcalcup" ${foodSource.energyUnit === 'kcalcup' ? 'selected' : ''}>kcal/cup</option>
@@ -2729,7 +2735,7 @@ const CALCULATOR_CONFIG = {
                     });
                 }
 
-                if (energyInput) {
+                if (energyInput && !energyInput.hasAttribute('readonly')) {
                     energyInput.addEventListener('input', () => {
                         this.updateFoodSourceData(id, 'energy', energyInput.value);
                         // If kibble reference changed, recompute daily target
@@ -2753,7 +2759,7 @@ const CALCULATOR_CONFIG = {
                     energyInput.addEventListener('blur', () => this.validateFoodSourceEnergy(id));
                 }
 
-                if (energyUnitSelect) {
+                if (energyUnitSelect && !energyUnitSelect.hasAttribute('disabled')) {
                     energyUnitSelect.addEventListener('change', () => {
                         this.updateFoodSourceData(id, 'energyUnit', energyUnitSelect.value);
                         if (id === this.kibbleRefId) {
@@ -3365,7 +3371,7 @@ const CALCULATOR_CONFIG = {
                 // Debug: log what unit is being used
                 console.log('UpdateFoodCalculations - unit:', unit, 'unitLabel:', unitLabel);
                 
-                // Determine frequency suffix for display
+                // Determine frequency suffix for display (will adjust per-item below)
                 const frequencySuffix = this.showPerMeal ? '/meal' : '/day';
                 
                 // Clear all food source errors first
@@ -3429,6 +3435,8 @@ const CALCULATOR_CONFIG = {
                 const kcalPerPercent = chartedPercent > 0 ? (chartedKcal / chartedPercent) : null;
 
                 // Second pass: finalize amounts
+                let splitDailyTotal = 0;
+                let dailyOnlyTotal = 0;
                 firstPass.forEach(({ fs, energyPer100g, gramsPortion }) => {
                     let dailyGramsForThisFood = 0;
                     let hasEnergyContent = !!(energyPer100g && energyPer100g > 0);
@@ -3447,12 +3455,14 @@ const CALCULATOR_CONFIG = {
                         }
                     }
 
-                    const displayGrams = this.showPerMeal ? dailyGramsForThisFood / this.mealsPerDay : dailyGramsForThisFood;
+                    const isDailyOnly = fs.splitByMeals === false;
+                    const displayGrams = (this.showPerMeal && !isDailyOnly) ? (dailyGramsForThisFood / this.mealsPerDay) : dailyGramsForThisFood;
 
                     foodBreakdowns.push({
                         name: fs.name,
                         percentage: fs.percentage,
                         dailyGrams: dailyGramsForThisFood,
+                        isDailyOnly: isDailyOnly,
                         displayGrams: displayGrams,
                         dailyCups: null,
                         displayCups: null,
@@ -3463,6 +3473,7 @@ const CALCULATOR_CONFIG = {
                         foodSource: fs
                     });
                     totalDailyGrams += dailyGramsForThisFood;
+                    if (isDailyOnly) dailyOnlyTotal += dailyGramsForThisFood; else splitDailyTotal += dailyGramsForThisFood;
                     if (dailyGramsForThisFood > 0) hasValidFoods = true;
                 });
 
@@ -3483,12 +3494,13 @@ const CALCULATOR_CONFIG = {
                     const unitButtons = document.getElementById('unitButtons');
                     if (unitButtons) unitButtons.style.display = 'none';
                     
-                    // If we have any food sources without energy content, still show the breakdown section
-                    if (foodBreakdowns.length > 0) {
+                    // If we have any foods with >0% but missing energy, show warnings only for those
+                    const visibleBreakdownsMissing = foodBreakdowns.filter(b => b.percentage > 0);
+                    if (visibleBreakdownsMissing.length > 0) {
                         // Show food amounts section with warnings for missing energy content
                         const unitLabel = unit === 'g' ? 'g' : unit === 'kg' ? 'kg' : unit === 'oz' ? 'oz' : 'lb';
                         
-                        const foodAmountsHTML = foodBreakdowns.map(breakdown => {
+                        const foodAmountsHTML = visibleBreakdownsMissing.map(breakdown => {
                             const lockIndicator = breakdown.isLocked ? '<span class="dog-calculator-lock-indicator">🔒</span>' : '';
                             
                             return `
@@ -3539,31 +3551,24 @@ const CALCULATOR_CONFIG = {
                 const unitButtons = document.getElementById('unitButtons');
                 if (unitButtons) unitButtons.style.display = 'flex';
 
-                // Update per-food breakdown
-                if (foodBreakdownList && foodBreakdowns.length > 1) {
-                    const breakdownHTML = foodBreakdowns.map(breakdown => {
+                // Update per-food breakdown (show only items with >0%)
+                const visibleBreakdowns = foodBreakdowns.filter(b => b.percentage > 0);
+                if (foodBreakdownList && visibleBreakdowns.length > 0) {
+                    const breakdownHTML = visibleBreakdowns.map(breakdown => {
                         let valueContent;
+                        // Choose per-item frequency suffix: daily-only items stay /day even in per-meal view
+                        const itemSuffix = (this.showPerMeal && !breakdown.isDailyOnly) ? '/meal' : '/day';
                         if (breakdown.hasEnergyContent) {
                             if (unit === 'cups') {
                                 // For cups, use the pre-calculated cups value if available
                                 if (breakdown.displayCups !== null) {
-                                    if (breakdown.hasRange && breakdown.displayCupsMin !== breakdown.displayCupsMax) {
-                                        valueContent = `${this.formatNumber(breakdown.displayCupsMin, decimals)}-${this.formatNumber(breakdown.displayCupsMax, decimals)} ${unitLabel}${frequencySuffix}`;
-                                    } else {
-                                        valueContent = `${this.formatNumber(breakdown.displayCups, decimals)} ${unitLabel}${frequencySuffix}`;
-                                    }
+                                    valueContent = `${this.formatNumber(breakdown.displayCups, decimals)} ${unitLabel}${itemSuffix}`;
                                 } else {
                                     valueContent = `<span class="dog-calculator-warning" title="Cups only available for foods with kcal/cup measurement">N/A</span>`;
                                 }
                             } else {
                                 // For other units (g, kg, oz, lb)
-                                if (breakdown.hasRange && breakdown.displayGramsMin !== breakdown.displayGramsMax) {
-                                    const minConverted = this.convertUnits(breakdown.displayGramsMin, unit);
-                                    const maxConverted = this.convertUnits(breakdown.displayGramsMax, unit);
-                                    valueContent = `${this.formatNumber(minConverted, decimals)}-${this.formatNumber(maxConverted, decimals)} ${unitLabel}${frequencySuffix}`;
-                                } else {
-                                    valueContent = `${this.formatNumber(this.convertUnits(breakdown.displayGrams, unit), decimals)} ${unitLabel}${frequencySuffix}`;
-                                }
+                                valueContent = `${this.formatNumber(this.convertUnits(breakdown.displayGrams, unit), decimals)} ${unitLabel}${itemSuffix}`;
                             }
                         } else {
                             valueContent = `<span class="dog-calculator-warning" title="Enter energy content to calculate amount">⚠️</span>`;
@@ -3586,7 +3591,8 @@ const CALCULATOR_CONFIG = {
                 // Generate individual food amount breakdown
                 
                 // Update daily food value with correct units
-                const displayTotal = this.showPerMeal ? totalDailyGrams / this.mealsPerDay : totalDailyGrams;
+                // When per-meal view is enabled, split-only items divide by meals/day; daily-only items remain as daily totals
+                const displayTotal = this.showPerMeal ? (splitDailyTotal / this.mealsPerDay + dailyOnlyTotal) : (splitDailyTotal + dailyOnlyTotal);
                 let convertedTotal;
                 let totalDisplayText;
                 
@@ -3653,7 +3659,8 @@ const CALCULATOR_CONFIG = {
                 dailyFoodValue.textContent = totalDisplayText;
                 
                 // Build HTML for individual food amounts
-                const foodAmountsHTML = foodBreakdowns.map(breakdown => {
+                const foodAmountsVisible = foodBreakdowns.filter(b => b.percentage > 0);
+                const foodAmountsHTML = foodAmountsVisible.map(breakdown => {
                     const lockIndicator = breakdown.isLocked ? '<span class="dog-calculator-lock-indicator">🔒</span>' : '';
                     
                     if (!breakdown.hasEnergyContent) {
diff --git a/src/js/calculator.js b/src/js/calculator.js
index b6f6f31..a7b52f2 100644
--- a/src/js/calculator.js
+++ b/src/js/calculator.js
@@ -106,7 +106,8 @@
                     energyUnit: 'kcal100g',
                     percentage: 0,
                     isLocked: false,
-                    chartType: null
+                    chartType: null,
+                    splitByMeals: false
                 };
                 this.foodSources.push(treats);
                 this.renderFoodSource(treats);
@@ -558,6 +559,11 @@
                 const container = document.getElementById('foodSources');
                 if (!container) return;
 
+                const isChart = foodSource.chartType === 'gc' || foodSource.chartType === 'kibble';
+                const energyReadonlyAttr = isChart ? 'readonly' : '';
+                const energyTitle = isChart ? 'Chart-based food: kcal locked' : 'Enter energy content';
+                const unitDisabledAttr = isChart ? 'disabled' : '';
+
                 const cardHTML = `
                     <div class="dog-calculator-food-source-card" id="foodSource-${foodSource.id}">
                         <div class="dog-calculator-food-source-header">
@@ -568,11 +574,11 @@
                         <div class="dog-calculator-input-group">
                             <div class="dog-calculator-form-group">
                                 <label for="energy-${foodSource.id}">Energy Content:</label>
-                                <input type="number" id="energy-${foodSource.id}" min="1" step="1" placeholder="Enter energy content" value="${foodSource.energy}">
+                                <input type="number" id="energy-${foodSource.id}" ${energyReadonlyAttr} title="${energyTitle}" min="1" step="1" placeholder="Enter energy content" value="${foodSource.energy}">
                             </div>
                             <div class="dog-calculator-form-group">
                                 <label for="energy-unit-${foodSource.id}">Unit:</label>
-                                <select id="energy-unit-${foodSource.id}" class="dog-calculator-unit-select">
+                                <select id="energy-unit-${foodSource.id}" class="dog-calculator-unit-select" ${unitDisabledAttr} title="${isChart ? 'Chart-based food: unit locked' : 'Select energy unit'}">
                                     <option value="kcal100g" ${foodSource.energyUnit === 'kcal100g' ? 'selected' : ''}>kcal/100g</option>
                                     <option value="kcalkg" ${foodSource.energyUnit === 'kcalkg' ? 'selected' : ''}>kcal/kg</option>
                                     <option value="kcalcup" ${foodSource.energyUnit === 'kcalcup' ? 'selected' : ''}>kcal/cup</option>
@@ -633,7 +639,7 @@
                     });
                 }
 
-                if (energyInput) {
+                if (energyInput && !energyInput.hasAttribute('readonly')) {
                     energyInput.addEventListener('input', () => {
                         this.updateFoodSourceData(id, 'energy', energyInput.value);
                         // If kibble reference changed, recompute daily target
@@ -657,7 +663,7 @@
                     energyInput.addEventListener('blur', () => this.validateFoodSourceEnergy(id));
                 }
 
-                if (energyUnitSelect) {
+                if (energyUnitSelect && !energyUnitSelect.hasAttribute('disabled')) {
                     energyUnitSelect.addEventListener('change', () => {
                         this.updateFoodSourceData(id, 'energyUnit', energyUnitSelect.value);
                         if (id === this.kibbleRefId) {
@@ -1269,7 +1275,7 @@
                 // Debug: log what unit is being used
                 console.log('UpdateFoodCalculations - unit:', unit, 'unitLabel:', unitLabel);
                 
-                // Determine frequency suffix for display
+                // Determine frequency suffix for display (will adjust per-item below)
                 const frequencySuffix = this.showPerMeal ? '/meal' : '/day';
                 
                 // Clear all food source errors first
@@ -1333,6 +1339,8 @@
                 const kcalPerPercent = chartedPercent > 0 ? (chartedKcal / chartedPercent) : null;
 
                 // Second pass: finalize amounts
+                let splitDailyTotal = 0;
+                let dailyOnlyTotal = 0;
                 firstPass.forEach(({ fs, energyPer100g, gramsPortion }) => {
                     let dailyGramsForThisFood = 0;
                     let hasEnergyContent = !!(energyPer100g && energyPer100g > 0);
@@ -1351,12 +1359,14 @@
                         }
                     }
 
-                    const displayGrams = this.showPerMeal ? dailyGramsForThisFood / this.mealsPerDay : dailyGramsForThisFood;
+                    const isDailyOnly = fs.splitByMeals === false;
+                    const displayGrams = (this.showPerMeal && !isDailyOnly) ? (dailyGramsForThisFood / this.mealsPerDay) : dailyGramsForThisFood;
 
                     foodBreakdowns.push({
                         name: fs.name,
                         percentage: fs.percentage,
                         dailyGrams: dailyGramsForThisFood,
+                        isDailyOnly: isDailyOnly,
                         displayGrams: displayGrams,
                         dailyCups: null,
                         displayCups: null,
@@ -1367,6 +1377,7 @@
                         foodSource: fs
                     });
                     totalDailyGrams += dailyGramsForThisFood;
+                    if (isDailyOnly) dailyOnlyTotal += dailyGramsForThisFood; else splitDailyTotal += dailyGramsForThisFood;
                     if (dailyGramsForThisFood > 0) hasValidFoods = true;
                 });
 
@@ -1387,12 +1398,13 @@
                     const unitButtons = document.getElementById('unitButtons');
                     if (unitButtons) unitButtons.style.display = 'none';
                     
-                    // If we have any food sources without energy content, still show the breakdown section
-                    if (foodBreakdowns.length > 0) {
+                    // If we have any foods with >0% but missing energy, show warnings only for those
+                    const visibleBreakdownsMissing = foodBreakdowns.filter(b => b.percentage > 0);
+                    if (visibleBreakdownsMissing.length > 0) {
                         // Show food amounts section with warnings for missing energy content
                         const unitLabel = unit === 'g' ? 'g' : unit === 'kg' ? 'kg' : unit === 'oz' ? 'oz' : 'lb';
                         
-                        const foodAmountsHTML = foodBreakdowns.map(breakdown => {
+                        const foodAmountsHTML = visibleBreakdownsMissing.map(breakdown => {
                             const lockIndicator = breakdown.isLocked ? '<span class="dog-calculator-lock-indicator">🔒</span>' : '';
                             
                             return `
@@ -1443,31 +1455,24 @@
                 const unitButtons = document.getElementById('unitButtons');
                 if (unitButtons) unitButtons.style.display = 'flex';
 
-                // Update per-food breakdown
-                if (foodBreakdownList && foodBreakdowns.length > 1) {
-                    const breakdownHTML = foodBreakdowns.map(breakdown => {
+                // Update per-food breakdown (show only items with >0%)
+                const visibleBreakdowns = foodBreakdowns.filter(b => b.percentage > 0);
+                if (foodBreakdownList && visibleBreakdowns.length > 0) {
+                    const breakdownHTML = visibleBreakdowns.map(breakdown => {
                         let valueContent;
+                        // Choose per-item frequency suffix: daily-only items stay /day even in per-meal view
+                        const itemSuffix = (this.showPerMeal && !breakdown.isDailyOnly) ? '/meal' : '/day';
                         if (breakdown.hasEnergyContent) {
                             if (unit === 'cups') {
                                 // For cups, use the pre-calculated cups value if available
                                 if (breakdown.displayCups !== null) {
-                                    if (breakdown.hasRange && breakdown.displayCupsMin !== breakdown.displayCupsMax) {
-                                        valueContent = `${this.formatNumber(breakdown.displayCupsMin, decimals)}-${this.formatNumber(breakdown.displayCupsMax, decimals)} ${unitLabel}${frequencySuffix}`;
-                                    } else {
-                                        valueContent = `${this.formatNumber(breakdown.displayCups, decimals)} ${unitLabel}${frequencySuffix}`;
-                                    }
+                                    valueContent = `${this.formatNumber(breakdown.displayCups, decimals)} ${unitLabel}${itemSuffix}`;
                                 } else {
                                     valueContent = `<span class="dog-calculator-warning" title="Cups only available for foods with kcal/cup measurement">N/A</span>`;
                                 }
                             } else {
                                 // For other units (g, kg, oz, lb)
-                                if (breakdown.hasRange && breakdown.displayGramsMin !== breakdown.displayGramsMax) {
-                                    const minConverted = this.convertUnits(breakdown.displayGramsMin, unit);
-                                    const maxConverted = this.convertUnits(breakdown.displayGramsMax, unit);
-                                    valueContent = `${this.formatNumber(minConverted, decimals)}-${this.formatNumber(maxConverted, decimals)} ${unitLabel}${frequencySuffix}`;
-                                } else {
-                                    valueContent = `${this.formatNumber(this.convertUnits(breakdown.displayGrams, unit), decimals)} ${unitLabel}${frequencySuffix}`;
-                                }
+                                valueContent = `${this.formatNumber(this.convertUnits(breakdown.displayGrams, unit), decimals)} ${unitLabel}${itemSuffix}`;
                             }
                         } else {
                             valueContent = `<span class="dog-calculator-warning" title="Enter energy content to calculate amount">⚠️</span>`;
@@ -1490,7 +1495,8 @@
                 // Generate individual food amount breakdown
                 
                 // Update daily food value with correct units
-                const displayTotal = this.showPerMeal ? totalDailyGrams / this.mealsPerDay : totalDailyGrams;
+                // When per-meal view is enabled, split-only items divide by meals/day; daily-only items remain as daily totals
+                const displayTotal = this.showPerMeal ? (splitDailyTotal / this.mealsPerDay + dailyOnlyTotal) : (splitDailyTotal + dailyOnlyTotal);
                 let convertedTotal;
                 let totalDisplayText;
                 
@@ -1557,7 +1563,8 @@
                 dailyFoodValue.textContent = totalDisplayText;
                 
                 // Build HTML for individual food amounts
-                const foodAmountsHTML = foodBreakdowns.map(breakdown => {
+                const foodAmountsVisible = foodBreakdowns.filter(b => b.percentage > 0);
+                const foodAmountsHTML = foodAmountsVisible.map(breakdown => {
                     const lockIndicator = breakdown.isLocked ? '<span class="dog-calculator-lock-indicator">🔒</span>' : '';
                     
                     if (!breakdown.hasEnergyContent) {