{"id":1838,"date":"2025-08-11T07:04:37","date_gmt":"2025-08-11T07:04:37","guid":{"rendered":"https:\/\/donhit.com\/en\/?p=1838"},"modified":"2025-08-12T08:39:51","modified_gmt":"2025-08-12T08:39:51","slug":"one-rep-max","status":"publish","type":"post","link":"https:\/\/donhit.com\/en\/calculator\/one-rep-max\/","title":{"rendered":"One Rep Max Calculator"},"content":{"rendered":"<p><center><body class=\"orm-app\">\r\n    <div class=\"orm-calculator\">\r\n        <h2 class=\"orm-title\">1RM Calculator<\/h2>\r\n        <p class=\"orm-subtitle\">Calculate your One Rep Max with precision<\/p>\r\n        \r\n        <form id=\"ormForm\">\r\n            <div class=\"orm-form-group\">\r\n                <label class=\"orm-label\" for=\"weight\">Weight Lifted<\/label>\r\n                <input \r\n                    type=\"number\" \r\n                    id=\"weight\" \r\n                    class=\"orm-input\" \r\n                    placeholder=\"Enter weight lifted\"\r\n                    min=\"1\"\r\n                    step=\"0.5\"\r\n                    required\r\n                >\r\n                <div class=\"orm-unit-group\">\r\n                    <button type=\"button\" class=\"orm-unit-btn active\" data-unit=\"kg\">Kilograms (kg)<\/button>\r\n                    <button type=\"button\" class=\"orm-unit-btn\" data-unit=\"lbs\">Pounds (lbs)<\/button>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"orm-form-group\">\r\n                <label class=\"orm-label\" for=\"reps\">Repetitions Performed<\/label>\r\n                <input \r\n                    type=\"number\" \r\n                    id=\"reps\" \r\n                    class=\"orm-input\" \r\n                    placeholder=\"Number of reps (1-15)\"\r\n                    min=\"1\"\r\n                    max=\"15\"\r\n                    required\r\n                >\r\n            <\/div>\r\n\r\n            <button type=\"submit\" class=\"orm-calculate-btn\">\r\n                Calculate 1RM\r\n            <\/button>\r\n        <\/form>\r\n\r\n        <div id=\"resultSection\" class=\"orm-result-section\">\r\n            <div class=\"orm-result-title\">Your One Rep Max<\/div>\r\n            <div class=\"orm-result-value\" id=\"ormValue\">0<\/div>\r\n            <div class=\"orm-result-unit\" id=\"ormUnit\">kg<\/div>\r\n            \r\n            <div class=\"orm-percentage-grid\">\r\n                <div class=\"orm-percentage-item\">\r\n                    <div class=\"orm-percentage-label\">95%<\/div>\r\n                    <div class=\"orm-percentage-value\" id=\"per95\">0<\/div>\r\n                <\/div>\r\n                <div class=\"orm-percentage-item\">\r\n                    <div class=\"orm-percentage-label\">90%<\/div>\r\n                    <div class=\"orm-percentage-value\" id=\"per90\">0<\/div>\r\n                <\/div>\r\n                <div class=\"orm-percentage-item\">\r\n                    <div class=\"orm-percentage-label\">85%<\/div>\r\n                    <div class=\"orm-percentage-value\" id=\"per85\">0<\/div>\r\n                <\/div>\r\n                <div class=\"orm-percentage-item\">\r\n                    <div class=\"orm-percentage-label\">80%<\/div>\r\n                    <div class=\"orm-percentage-value\" id=\"per80\">0<\/div>\r\n                <\/div>\r\n                <div class=\"orm-percentage-item\">\r\n                    <div class=\"orm-percentage-label\">75%<\/div>\r\n                    <div class=\"orm-percentage-value\" id=\"per75\">0<\/div>\r\n                <\/div>\r\n                <div class=\"orm-percentage-item\">\r\n                    <div class=\"orm-percentage-label\">70%<\/div>\r\n                    <div class=\"orm-percentage-value\" id=\"per70\">0<\/div>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"orm-formula-info\">\r\n                <div class=\"orm-formula-title\">Formula Used: Brzycki<\/div>\r\n                <div class=\"orm-formula-text\">\r\n                    1RM = Weight \u00f7 (1.0278 - 0.0278 \u00d7 Reps)<br>\r\n                    This formula is most accurate for 1-10 repetitions.\r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/div>\r\n\r\n    <script>\r\n        let currentUnit = 'kg';\r\n        \r\n        \/\/ Unit selection\r\n        document.querySelectorAll('.orm-unit-btn').forEach(btn => {\r\n            btn.addEventListener('click', function() {\r\n                document.querySelectorAll('.orm-unit-btn').forEach(b => b.classList.remove('active'));\r\n                this.classList.add('active');\r\n                currentUnit = this.dataset.unit;\r\n                document.getElementById('ormUnit').textContent = currentUnit;\r\n            });\r\n        });\r\n\r\n        \/\/ Form submission\r\n        document.getElementById('ormForm').addEventListener('submit', function(e) {\r\n            e.preventDefault();\r\n            \r\n            const weight = parseFloat(document.getElementById('weight').value);\r\n            const reps = parseInt(document.getElementById('reps').value);\r\n            \r\n            if (!weight || !reps || reps < 1 || reps > 15) {\r\n                alert('Please enter valid weight and repetitions (1-15 reps).');\r\n                return;\r\n            }\r\n\r\n            \/\/ Calculate 1RM using Brzycki formula\r\n            const oneRepMax = weight \/ (1.0278 - (0.0278 * reps));\r\n            \r\n            \/\/ Display results\r\n            displayResults(oneRepMax);\r\n        });\r\n\r\n        function displayResults(orm) {\r\n            \/\/ Round to 1 decimal place\r\n            const roundedOrm = Math.round(orm * 10) \/ 10;\r\n            \r\n            \/\/ Update main result\r\n            document.getElementById('ormValue').textContent = roundedOrm;\r\n            document.getElementById('ormUnit').textContent = currentUnit;\r\n            \r\n            \/\/ Calculate and display percentages\r\n            const percentages = [95, 90, 85, 80, 75, 70];\r\n            percentages.forEach(percent => {\r\n                const value = Math.round((orm * percent \/ 100) * 10) \/ 10;\r\n                document.getElementById(`per${percent}`).textContent = value;\r\n            });\r\n            \r\n            \/\/ Show result section with animation\r\n            const resultSection = document.getElementById('resultSection');\r\n            resultSection.classList.add('show');\r\n            \r\n            \/\/ Smooth scroll to results\r\n            resultSection.scrollIntoView({ \r\n                behavior: 'smooth', \r\n                block: 'nearest' \r\n            });\r\n        }\r\n\r\n        \/\/ Input validation and formatting\r\n        document.getElementById('weight').addEventListener('input', function() {\r\n            if (this.value < 0) this.value = 0;\r\n        });\r\n\r\n        document.getElementById('reps').addEventListener('input', function() {\r\n            if (this.value < 1) this.value = 1;\r\n            if (this.value > 15) this.value = 15;\r\n        });\r\n\r\n        \/\/ Add smooth focus transitions\r\n        document.querySelectorAll('.orm-input').forEach(input => {\r\n            input.addEventListener('focus', function() {\r\n                this.parentElement.style.transform = 'translateY(-2px)';\r\n            });\r\n            \r\n            input.addEventListener('blur', function() {\r\n                this.parentElement.style.transform = 'translateY(0)';\r\n            });\r\n        });\r\n    <\/script><\/center><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[184],"tags":[],"class_list":["post-1838","post","type-post","status-publish","format-standard","hentry","category-calculator"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - 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Accurately estimate your max lift for squats, bench press, deadlifts, and more.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/donhit.com\/en\/calculator\/one-rep-max\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"One Rep Max Calculator - DonHit\" \/>\n<meta property=\"og:description\" content=\"Find your one-rep max (1RM) instantly with our One Rep Max Calculator. Accurately estimate your max lift for squats, bench press, deadlifts, and more.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/donhit.com\/en\/calculator\/one-rep-max\/\" \/>\n<meta property=\"og:site_name\" content=\"DonHit - World of Tools\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-11T07:04:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-12T08:39:51+00:00\" \/>\n<meta name=\"author\" content=\"DonHit\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"DonHit\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"One Rep Max Calculator - DonHit","description":"Find your one-rep max (1RM) instantly with our One Rep Max Calculator. 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