Free Fitness Tools & Calculators
Welcome to the Optimo Coach toolkit — a growing collection of free, interactive fitness calculators and planning tools built to give you honest, data-led answers instead of guesswork. Whether you’re mapping out glute growth, working out a realistic body-composition timeline, checking whether a food is actually worth it for protein, or navigating training through menopause or the postpartum period, there’s a tool here to help you make a smarter decision. Every one is quick to use, free, and designed to be genuinely useful rather than a sales pitch.
These tools were built and reviewed by our coaching team — Level 3 qualified personal trainers, CIMSPA endorsed and YMCA Awards certified, based in London. They’re educational aids to help you plan and understand, not a substitute for personalised coaching or medical advice. Pick a category below and dive in.
Glute & booty building tools
Plan smarter lower-body training and set realistic expectations for shape and growth.
Glute Growth Potential Calculator
Estimate your natural glute-building potential from your training history and starting point, with a realistic sense of how much growth to expect and over what timeframe.
Try the glute growth potential calculatorGlute Training Volume Calculator
Work out how many weekly sets your glutes actually need to grow, matched to your experience level, so you train enough to progress without wasted junk volume.
Work out your glute training volumeGlute-to-Waist Ratio Calculator
Measure your glute-to-waist ratio and see how it maps to lower-body shape and proportion — a popular, quick marker for tracking progress over a training block.
Calculate your glute-to-waist ratioBody composition & transformation tools
Set honest expectations for fat loss, muscle gain and how your body changes over time.
Fat Loss vs Muscle Gain Tradeoff Calculator
See how losing fat and building muscle pull against each other, and what a realistic body-composition change looks like when you’re trying to do both.
Try the fat loss vs muscle gain calculatorBody Recomposition Timeline Calculator
Get a realistic timeline for changing your body composition — losing fat and gaining muscle at the same time — based on your starting point and training age.
Estimate your body recomposition timelineWaist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and understand what it indicates about shape and health, benchmarked against World Health Organization reference points.
Calculate your waist-to-hip ratioFitness Age Calculator
Estimate your “fitness age” from your resting heart rate, activity level and measurements, and see how it compares to the number on your birth certificate.
Check your fitness ageNutrition & lifestyle tools
Make smarter food and lifestyle choices with data instead of marketing.
Protein ROI Calculator
Find out whether a food is genuinely worth it for protein by scoring its protein per calorie against the official UK “source of protein” and “high in protein” thresholds.
Score your food’s protein ROIExpat Fitness Grocery Budget Adjuster
Plan a realistic grocery budget for your fitness goals wherever in the world you live, adjusted for local food costs so your nutrition plan stays affordable.
Adjust your fitness grocery budgetLondon Active Lives Borough Benchmark Tool
See how active your London borough is compared with the rest of the city, using Sport England’s Active Lives data — a quick way to benchmark your local area.
Benchmark your London boroughWomen’s training through life stages
Evidence-led, safety-first tools for training through the changes that matter.
Perimenopause & Menopause Training Adjuster
Get sensible training and recovery adjustments tailored to perimenopause and menopause, grounded in current research on strength, bone health and hormones.
Adjust your menopause training planPostpartum Return-to-Training Readiness Checker
A safety-first checker to help you gauge whether you’re ready to return to exercise after having a baby, with clear guidance on red-flag symptoms and when to see a professional.
Check your postpartum training readinessWhy you can trust these tools
CIMSPA endorsed. Our coaching aligns with the standards of the Chartered Institute for the Management of Sport and Physical Activity, the UK’s professional body for the sector.
YMCA Awards certified. Our coaches are qualified through one of the UK’s most established, Ofqual-regulated awarding organisations for fitness professionals.
Level 3 personal trainers. Every coach is qualified to at least Level 3, the recognised professional standard for personal training in the UK.
Based in London. We coach in person across London and online worldwide.
These calculators are educational and give general estimates, not personalised prescriptions. Anything involving a medical condition, pregnancy, the postpartum period or a clinical diet should be checked with your GP, a registered dietitian or an appropriate specialist. When that’s the right call, we’ll always say so.
Want a plan built around your goals rather than a generic template? Have a no-obligation chat with a qualified coach.
- YMCA Level 2 Certification in Gym Instructing
- YMCA Level 2 Certification in Personal Training (Practitioner)
- YMCA Level 2 Certification in Gym Instructing and Personal Training (Practitionar)
