--- title: "One Rep Max Calculator | Furlani Fitness" description: "Free one rep max calculator in kilograms: an estimated max from a weight lifted and the reps performed with it, with the Brzycki, O'Conner, Epley, Lombardi and Mayhew models side by side." canonical: https://www.furlanifitness.com.au/one-rep-max-calculator/ image: https://www.furlanifitness.com.au/og-card.png --- # One rep max calculator. [Calculator](https://www.furlanifitness.com.au/calculators/) Your estimated max, from one set. Kilograms only. Enter the weight lifted and the reps performed with it. 01 Weight lifted kg 02 Reps performed ## Five published estimates. The models Each model is implemented exactly as its author published it, and the headline figure is their average. w is the weight lifted, r the reps performed. ### Brzycki w × 36 ÷ (37 − r). Matt Brzycki (1993), “Strength testing — predicting a one-rep max from reps-to-fatigue”, Journal of Physical Education, Recreation & Dance 64(1). Usually printed as w ÷ (1.0278 − 0.0278r), which is the same equation with its fractions truncated; the exact form is used here. ### O'Conner w × (1 + 0.025r). Bob O'Conner, Jerry Simmons and J. Patrick O'Shea (1989), Weight Training Today. ### Epley w × (1 + r ÷ 30). Boyd Epley (1985), Poundage Chart, Boyd Epley Workout, University of Nebraska. ### Lombardi w × r^(0.10). V. Patteson Lombardi (1989), Beginning Weight Training. ### Mayhew 100w ÷ (52.2 + 41.9e^(−0.055r)). Jerry Mayhew and colleagues (1992), Journal of Applied Sport Science Research 6(4). ### The warm-up ladder Four sets at 40, 60, 75 and 90 per cent of the estimated max, reps tapering from eight to one, each weight rounded to the nearest 2.5 kg — the smallest step a barbell loads with a 1.25 kg plate on each side. Each bar is that set's share of the max, drawn to scale. The percentages prime the movement without spending the max; the scheme is the conventional attempt-day taper. These are estimates from reps to fatigue, not measurements: the only true test of a one rep max is lifting it. They hold best at ten reps or fewer, which is why the reps field stops at fifteen. Every result is calculated locally. Nothing is stored and nothing is sent anywhere. ## Need help with a better program or diet? Consultation Begin with a 30-minute consultation. We'll talk and get clear on what you want, where you are today, and what's needed to hit your goals faster. [Request a consultation](https://www.furlanifitness.com.au/contact/) ## Structured data ```json { "@context": "https://schema.org", "@graph": [ { "@type": "WebSite", "@id": "https://www.furlanifitness.com.au/#website", "url": "https://www.furlanifitness.com.au", "name": "Furlani Fitness", "publisher": { "@id": "https://www.furlanifitness.com.au/#business" } }, { "@type": [ "LocalBusiness", "HealthClub" ], "@id": "https://www.furlanifitness.com.au/#business", "name": "Furlani Fitness", "description": "Private, evidence-led personal training and health optimisation in Brisbane CBD. Training, nutrition, and body optimisation, one-to-one.", "url": "https://www.furlanifitness.com.au", "image": [ "https://www.furlanifitness.com.au/_astro/training-floor-morning-light.sxQg8p9G_Z1JNddJ.webp", "https://www.furlanifitness.com.au/_astro/strength-floor-racks.BkEVbWto_Z1brB7k.webp", "https://www.furlanifitness.com.au/_astro/recovery-pools.BlaXDte8_op8LH.webp", "https://www.furlanifitness.com.au/og-card.png" ], "logo": "https://www.furlanifitness.com.au/favicon.svg", "priceRange": "$$$", "foundingDate": "2015-11-15", "hasMap": "https://www.google.com/maps?cid=11139443442130971414", "address": { "@type": "PostalAddress", "streetAddress": "157 Ann St", "addressLocality": "Brisbane City", "addressRegion": "QLD", "postalCode": "4000", "addressCountry": "AU" }, "geo": { "@type": "GeoCoordinates", "latitude": -27.4674873, "longitude": 153.0249379 }, "founder": { "@id": "https://www.furlanifitness.com.au/#isaac-furlani" }, "aggregateRating": { "@type": "AggregateRating", "ratingValue": 5, "reviewCount": 57, "bestRating": 5 }, "telephone": "+61432525533", "openingHoursSpecification": { "@type": "OpeningHoursSpecification", "dayOfWeek": [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday" ], "opens": "06:00", "closes": "19:00" }, "email": "isaac@furlanifitness.com", "award": [ "The Best Personal Trainer in Brisbane CBD (Quality Business Awards, 2025)", "Best Personal Trainer (The Best Brisbane)" ], "sameAs": [ "https://www.google.com/maps?cid=11139443442130971414", "https://qualitybusinessawards.com.au/2025/the-best-Personal-Trainer-in-Brisbane-Central-Business-District/Furlani-Fitness", "https://www.thebestbrisbane.com/top-personal-trainers-brisbane/", "https://www.wikidata.org/wiki/Q140778182" ] }, { "@type": "Person", "@id": "https://www.furlanifitness.com.au/#isaac-furlani", "name": "Isaac Furlani", "jobTitle": "Senior Coach", "url": "https://www.furlanifitness.com.au", "hasOccupation": { "@type": "Occupation", "name": "Personal Trainer", "occupationLocation": { "@type": "City", "name": "Brisbane City, QLD" } }, "worksFor": { "@id": "https://www.furlanifitness.com.au/#business" }, "image": "https://www.furlanifitness.com.au/_astro/isaac-furlani-portrait.BJ4wCxf1_Z1LL5gp.webp", "description": "Certified coach, and eleven years in practice", "sameAs": [ "https://www.linkedin.com/in/isaac-furlani" ], "knowsAbout": [ "Personal training", "Strength and conditioning", "Exercise science", "Biomechanics", "Nutrition", "Nutritional chemistry", "Nootropics", "Biohacking", "Endocrinology", "Neuroscience" ] }, { "@type": "WebApplication", "@id": "https://www.furlanifitness.com.au/one-rep-max-calculator/#tool", "name": "One Rep Max Calculator", "url": "https://www.furlanifitness.com.au/one-rep-max-calculator/", "applicationCategory": "UtilitiesApplication", "operatingSystem": "Any", "description": "One rep max calculator in kilograms: an estimated max from a weight lifted and the reps performed with it, alongside the Brzycki, O'Conner, Epley, Lombardi and Mayhew models.", "offers": { "@type": "Offer", "price": "0", "priceCurrency": "AUD" } } ] } ```