{"id":49,"date":"2026-06-27T15:07:13","date_gmt":"2026-06-27T15:07:13","guid":{"rendered":"https:\/\/wolfsickness.com\/?page_id=49"},"modified":"2026-06-27T15:19:12","modified_gmt":"2026-06-27T15:19:12","slug":"sp-500-calculator","status":"publish","type":"page","link":"https:\/\/wolfsickness.com\/?page_id=49","title":{"rendered":"S&amp;P 500 Calculator"},"content":{"rendered":"<nav class=\"is-responsive wp-block-navigation is-layout-flex wp-block-navigation-is-layout-flex\" aria-label=\"Navigation\" \n\t\t data-wp-interactive=\"core\/navigation\" data-wp-context='{\"overlayOpenedBy\":{\"click\":false,\"hover\":false,\"focus\":false},\"type\":\"overlay\",\"roleAttribute\":\"\",\"ariaLabel\":\"Menu\"}'><button aria-haspopup=\"dialog\" aria-label=\"Open menu\" class=\"wp-block-navigation__responsive-container-open\" \n\t\t\t\tdata-wp-on--click=\"actions.openMenuOnClick\"\n\t\t\t\tdata-wp-on--keydown=\"actions.handleMenuKeydown\"\n\t\t\t><svg width=\"24\" height=\"24\" 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class=\"wp-block-navigation__responsive-container-close\" \n\t\t\t\tdata-wp-on--click=\"actions.closeMenuOnClick\"\n\t\t\t><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\" width=\"24\" height=\"24\" aria-hidden=\"true\" focusable=\"false\"><path d=\"m13.06 12 6.47-6.47-1.06-1.06L12 10.94 5.53 4.47 4.47 5.53 10.94 12l-6.47 6.47 1.06 1.06L12 13.06l6.47 6.47 1.06-1.06L13.06 12Z\"><\/path><\/svg><\/button>\n\t\t\t\t\t\t\t<div class=\"wp-block-navigation__responsive-container-content\" \n\t\t\t\tdata-wp-watch=\"callbacks.focusFirstElement\"\n\t\t\t id=\"modal-1-content\">\n\t\t\t\t\t\t\t\t<ul class=\"wp-block-navigation__container is-responsive wp-block-navigation\"><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/wolfsickness.com\/?page_id=25\"><span class=\"wp-block-navigation-item__label\">YouTube<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/wolfsickness.com\/?page_id=49\"><span class=\"wp-block-navigation-item__label\">S&amp;P 500 Calculator<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/wolfsickness.com\/?page_id=69\"><span class=\"wp-block-navigation-item__label\">Strava<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/wolfsickness.com\/?page_id=80\"><span class=\"wp-block-navigation-item__label\">Match Game<\/span><\/a><\/li><li class=\"wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/wolfsickness.com\/?page_id=92\"><span class=\"wp-block-navigation-item__label\">Timezones + Weather<\/span><\/a><\/li><\/ul>\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div><\/nav>\n\n<div style=\"width: 100%; clear: both; display: block; overflow: hidden;\">\n    <div class=\"calculator-card\">\n        <style>\n            \/* Force border-box to prevent width blowouts *\/\n            .calculator-card, .calculator-card * {\n                box-sizing: border-box !important;\n            }\n            .calculator-card {\n                background-color: #ffffff;\n                padding: 1.5rem;\n                border-radius: 12px;\n                box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);\n                width: 100%;\n                max-width: 600px;\n                margin: 0 auto; \n                font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n                color: #1f2937;\n            }\n            .calculator-card h2 {\n                margin-top: 0;\n                margin-bottom: 1.5rem;\n                text-align: center;\n                color: #111827;\n                font-size: 1.5rem;\n            }\n            \n            \/* The Magic Fix: Fluid Flexbox instead of Grid *\/\n            .input-fluid-container {\n                display: flex;\n                flex-wrap: wrap;\n                gap: 1rem;\n                margin-bottom: 1.5rem;\n            }\n            .input-group {\n                flex: 1 1 calc(50% - 0.5rem);\n                min-width: 220px; \/* If it shrinks below this, it forces a stack *\/\n                display: flex;\n                flex-direction: column;\n            }\n            \n            .input-group label {\n                font-size: 0.875rem;\n                font-weight: 600;\n                margin-bottom: 0.5rem;\n                color: #374151;\n            }\n            .input-group input {\n                padding: 0.75rem;\n                border: 1px solid #d1d5db;\n                border-radius: 6px;\n                font-size: 1rem;\n                background-color: #f9fafb;\n                width: 100%;\n            }\n            .input-group input:focus {\n                outline: none;\n                border-color: #3b82f6;\n                box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);\n                background-color: #ffffff;\n            }\n            .result-container {\n                text-align: center;\n                margin-bottom: 1.5rem;\n                padding: 1rem;\n                background-color: #f0fdf4;\n                border-radius: 8px;\n                border: 1px solid #bbf7d0;\n            }\n            .result-title {\n                font-size: 1rem;\n                color: #166534;\n                margin-bottom: 0.5rem;\n                font-weight: 600;\n            }\n            .result-value {\n                font-size: 2rem;\n                font-weight: 700;\n                color: #15803d;\n                margin: 0;\n                word-wrap: break-word; \n            }\n            .chart-container {\n                position: relative;\n                width: 100%;\n                height: 250px; \/* Fixed height so canvas doesn't glitch on mobile *\/\n            }\n            canvas {\n                width: 100% !important;\n                height: 100% !important;\n            }\n        <\/style>\n\n        <h2>S&#038;P 500 Calculator<\/h2>\n        \n        <div class=\"input-fluid-container\">\n            <div class=\"input-group\">\n                <label for=\"initial\">Initial Investment (\u00a3)<\/label>\n                <input type=\"number\" id=\"initial\" value=\"1000\" min=\"0\">\n            <\/div>\n            <div class=\"input-group\">\n                <label for=\"monthly\">Monthly Contribution (\u00a3)<\/label>\n                <input type=\"number\" id=\"monthly\" value=\"200\" min=\"0\">\n            <\/div>\n            <div class=\"input-group\">\n                <label for=\"rate\">Expected Annual Return (%)<\/label>\n                <input type=\"number\" id=\"rate\" value=\"10\" min=\"0\" step=\"0.1\">\n            <\/div>\n            <div class=\"input-group\">\n                <label for=\"years\">Years to Invest<\/label>\n                <input type=\"number\" id=\"years\" value=\"20\" min=\"1\" max=\"50\">\n            <\/div>\n        <\/div>\n\n        <div class=\"result-container\">\n            <div class=\"result-title\">Projected Final Balance<\/div>\n            <div class=\"result-value\" id=\"final-balance\">\u00a30.00<\/div>\n        <\/div>\n\n        <div class=\"chart-container\">\n            <canvas id=\"growthChart\"><\/canvas>\n        <\/div>\n\n        <!-- Ensure Chart.js is loaded -->\n        <script src=\"https:\/\/cdn.jsdelivr.net\/npm\/chart.js\"><\/script>\n        <script>\n            let growthChart = null;\n\n            const currencyFormatter = new Intl.NumberFormat('en-GB', {\n                style: 'currency',\n                currency: 'GBP',\n                maximumFractionDigits: 0\n            });\n\n            function calculateAndDraw() {\n                const initial = parseFloat(document.getElementById('initial').value) || 0;\n                const monthly = parseFloat(document.getElementById('monthly').value) || 0;\n                const rate = parseFloat(document.getElementById('rate').value) || 0;\n                const years = parseInt(document.getElementById('years').value) || 0;\n\n                const labels = [];\n                const balanceData = [];\n                const principalData = [];\n\n                let currentBalance = initial;\n                let currentPrincipal = initial;\n                const monthlyRate = (rate \/ 100) \/ 12;\n\n                labels.push('Year 0');\n                balanceData.push(currentBalance);\n                principalData.push(currentPrincipal);\n\n                for (let y = 1; y <= years; y++) {\n                    for (let m = 1; m <= 12; m++) {\n                        currentBalance = (currentBalance * (1 + monthlyRate)) + monthly;\n                        currentPrincipal += monthly;\n                    }\n                    labels.push('Year ' + y);\n                    balanceData.push(currentBalance);\n                    principalData.push(currentPrincipal);\n                }\n\n                document.getElementById('final-balance').innerText = currencyFormatter.format(currentBalance);\n\n                const ctx = document.getElementById('growthChart').getContext('2d');\n\n                if (growthChart) {\n                    growthChart.destroy();\n                }\n\n                growthChart = new Chart(ctx, {\n                    type: 'line',\n                    data: {\n                        labels: labels,\n                        datasets: [\n                            {\n                                label: 'Total Value',\n                                data: balanceData,\n                                borderColor: '#10b981',\n                                backgroundColor: 'rgba(16, 185, 129, 0.2)',\n                                fill: true,\n                                tension: 0.3\n                            },\n                            {\n                                label: 'Total Contributions',\n                                data: principalData,\n                                borderColor: '#6b7280',\n                                borderDash: [5, 5],\n                                backgroundColor: 'transparent',\n                                fill: false,\n                                tension: 0.3\n                            }\n                        ]\n                    },\n                    options: {\n                        responsive: true,\n                        maintainAspectRatio: false, \n                        interaction: {\n                            mode: 'index',\n                            intersect: false,\n                        },\n                        plugins: {\n                            tooltip: {\n                                callbacks: {\n                                    label: function(context) {\n                                        return context.dataset.label + ': ' + currencyFormatter.format(context.raw);\n                                    }\n                                }\n                            }\n                        },\n                        scales: {\n                            x: {\n                                ticks: {\n                                    maxRotation: 45,\n                                    minRotation: 45\n                                }\n                            },\n                            y: {\n                                beginAtZero: true,\n                                ticks: {\n                                    callback: function(value) {\n                                        if (value >= 1000000) {\n                                            return '\u00a3' + (value \/ 1000000).toFixed(1) + 'M';\n                                        } else if (value >= 1000) {\n                                            return '\u00a3' + (value \/ 1000).toFixed(0) + 'k';\n                                        }\n                                        return '\u00a3' + value;\n                                    }\n                                }\n                            }\n                        }\n                    }\n                });\n            }\n\n            const inputs = document.querySelectorAll('.calculator-card input');\n            inputs.forEach(input => {\n                input.addEventListener('input', calculateAndDraw);\n            });\n\n            setTimeout(calculateAndDraw, 100);\n        <\/script>\n    <\/div>\n<\/div>\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>S&#038;P 500 Investment Calculator<\/title>\n    <!-- Import Chart.js for the graph -->\n    <script src=\"https:\/\/cdn.jsdelivr.net\/npm\/chart.js\"><\/script>\n    <style>\n        body {\n            font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n            background-color: #f3f4f6;\n            color: #1f2937;\n            display: flex;\n            justify-content: center;\n            padding: 2rem 1rem;\n            margin: 0;\n        }\n        .calculator-card {\n            background-color: #ffffff;\n            padding: 2rem;\n            border-radius: 12px;\n            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);\n            max-width: 600px;\n            width: 100%;\n        }\n        h2 {\n            margin-top: 0;\n            margin-bottom: 1.5rem;\n            text-align: center;\n            color: #111827;\n        }\n        .input-grid {\n            display: grid;\n            grid-template-columns: 1fr 1fr;\n            gap: 1rem;\n            margin-bottom: 1.5rem;\n        }\n        @media (max-width: 480px) {\n            .input-grid {\n                grid-template-columns: 1fr;\n            }\n        }\n        .input-group {\n            display: flex;\n            flex-direction: column;\n        }\n        label {\n            font-size: 0.875rem;\n            font-weight: 600;\n            margin-bottom: 0.5rem;\n            color: #374151;\n        }\n        input {\n            padding: 0.75rem;\n            border: 1px solid #\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>S&#038;P 500 Calculator Initial Investment (\u00a3) Monthly Contribution (\u00a3) Expected Annual Return (%) Years to Invest Projected Final Balance \u00a30.00 S&#038;P 500 Investment Calculator body { font-family: -apple-system, BlinkMacSystemFont, &#8220;Segoe UI&#8221;, Roboto, Helvetica, Arial, sans-serif; background-color: #f3f4f6; color: #1f2937; display: flex; justify-content: center; padding: 2rem 1rem; margin: 0; } .calculator-card { background-color: #ffffff; padding: 2rem; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-49","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>S&amp;P 500 Calculator - Wolfsickness<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/wolfsickness.com\/?page_id=49\" \/>\n<meta property=\"og:locale\" content=\"en_US\" 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