GFR Calculator
Health & FitnessEstimate your glomerular filtration rate (GFR)
RunReps has developed a full set of running tools and calculators to support every type of runner. From planning your next race with our Training Plan Generator, to working out splits with the Pace Calculator, each tool is designed to be quick, accurate, and easy to use. Explore the options below to track progress, analyse performance, and train with confidence.
Discover our comprehensive collection of running calculators, training tools, and fitness resources designed to help you achieve your goals.
Estimate your glomerular filtration rate (GFR)
Work out how much dietary fat you should be eating each day
Calculate your daily calories and macronutrient split
The Target Heart Rate Calculator helps you identify the training zones that match your fitness goals
Calculate your Body Surface Area (BSA) instantly using height and weight
Estimate your body fat using Navy, Skinfold or BMI methods.
Getting your fuelling strategy right can make all the difference on race day
Calculate your daily protein needs
Plan your race strategy with weather insights
Generate a Push/Pull workout plan.
Calculate personalised run-walk intervals tailored specifically to your pace and goals.
Personalised feedback on key aspects of your running technique
Precisely plan your pacing strategy for any race distance.
Balance your weekly running volume, intensity, and recovery
Convert your current running pace into personalised heart rate zones, providing clarity on training intensities and guiding effective workout planning.
Convert your current running pace at altitude into the equivalent pace at sea level, providing clarity on their true performance.
Input your current treadmill pace and incline level to instantly see what your equivalent outdoor pace would be.
The running plan generator is a tool designed to help runners of all levels achieve their desired running distance and fitness goals
Run Every Day January, often referred to as RED January, is a fitness challenge designed to start the new year on a positive note
Understand your Body Mass Index (BMI) and its implications for your health.
Understand and optimise your performance across varied terrains.
The interval session generator is a powerful tool for runners who are looking to improve their performance and increase their endurance
12 week jump rope generator to create a unique plan
Generate a workout plan to achieve 500 squats in a day
Personalised 12 week bar dip plan
Try adjusting your filter or browse all tools.
Welcome to the RunReps toolbox — a collection of calculators and planners built to make your training smarter, easier, and more enjoyable. Whether you’re fine-tuning race pace, exploring personalised training plans, or simply converting miles to kilometres, you’ll find everything you need in one place.
Each tool has been designed to be quick to use and easy to understand. From the Pace Calculator and Negative Split Calculator, to the Age Grading Calculator and Hill Grade Adjusted Pace tool, our goal is to help you better understand your performance and guide your next steps.
Many runners also use our Weight vs Pace Calculator to see how changes in body weight affect running speed, or explore structured workouts through the Intervals tool and Workouts library. Whether you’re training for a first 5K or aiming for a marathon PB, there’s a tool here for you.
Simply choose the calculator you need below and follow the on-screen steps. If you’d like advice on how to use the results in your training, get in touch with us — we’re always happy to help.
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