# Captain Physique > Free online calculators for math, science, percentages, area, and everyday problems. Fast, accurate, and easy to use — no signup required. Every tool and article on Captain Physique is free to use — no sign-up required. The links below are the primary, canonical resources on this site. ## Tools - [Discount Calculator](https://captaincalc.xyz/calculator/discount-calculator/): Gym Memberships, Supplements, and the Math You're Probably Getting Wrong Let's be honest — most of us are terrible at calculating discounts in our he… - [Date Calculator](https://captaincalc.xyz/calculator/date-calculator/): Why Dates Matter More Than You Think in Health and Fitness Most people who take their health seriously track the obvious numbers — reps, sets, calori… - [Unit Converter](https://captaincalc.xyz/calculator/unit-converter/): Why Unit Conversion Actually Matters in Health and Fitness If you've ever followed a nutrition plan written in grams while your kitchen scale only sh… - [Currency Converter](https://captaincalc.xyz/calculator/currency-converter/): The Morning I Realized My Travel Budget Was Built on Bad Math It started with a spreadsheet and a dream. My partner and I had been planning a six-wee… - [Percentage Calculator](https://captaincalc.xyz/calculator/percentage-calculator/): Why Fitness People Are Obsessed With Percentage Calculators (And You Should Be Too) There's a moment in almost every serious fitness journey where th… - [Tip Calculator](https://captaincalc.xyz/calculator/tip-calculator/): Tipping Without the Math Headache: A Real-World Guide to Tip Calculators You've just finished a solid meal after a long gym session. The bill arrives… - [BMI Calculator](https://captaincalc.xyz/calculator/bmi-calculator/): 7 Things a BMI Calculator Actually Tells You (And 3 Things It Definitely Does Not) Pull up any BMI calculator online and you get the same experience:… - [401(k) Calculator](https://captaincalc.xyz/calculator/401k-calculator/): Retirement Math You Actually Need: Breaking Down the 401(k) Calculator Most people know they should be saving for retirement. Fewer people know wheth… - [Auto Loan Calculator](https://captaincalc.xyz/calculator/auto-loan-calculator/): What Exactly Does an Auto Loan Calculator Tell You? At its core, an auto loan calculator takes three inputs — your loan amount, your interest rate, a… - [Mortgage Calculator](https://captaincalc.xyz/calculator/mortgage-calculator/): No, a Mortgage Calculator Is Not Just for Banks — It's Your Personal Financial Fitness Trainer Most people think a mortgage calculator is something y… - [Body Fat Percentage Calculator (Navy Method)](https://captaincalc.xyz/calculator/body-fat-percentage-calculator/): Calculate your body fat percentage using the U.S. Navy tape-measure method. Enter neck, waist, hip, and height — get instant, accurate results for fr… - [Lean Body Mass & Fat Mass Calculator](https://captaincalc.xyz/calculator/lean-body-mass-calculator/): Calculate lean body mass and fat mass using the US Navy method. Enter your measurements to split weight into muscle and fat and track real body compo… - [One-Rep Max (1RM) Strength Calculator](https://captaincalc.xyz/calculator/one-rep-max-calculator/): Calculate your estimated 1RM using Epley, Brzycki, and Lombardi formulas. Get a full % training table to plan your strength workouts smarter. - [Macro Split Calculator for Cutting & Bulking](https://captaincalc.xyz/calculator/macro-split-calculator/): Calculate your exact daily protein, carbs, and fat grams for cutting, maintaining, or bulking. Enter calories and weight for a science-backed macro s… - [FFMI (Fat-Free Mass Index) Calculator](https://captaincalc.xyz/calculator/ffmi-calculator/): Free FFMI Calculator — enter your weight, height, and body fat % to get your Fat-Free Mass Index, normalized FFMI, and see how close you are to your … - [Ideal Body Weight & Goal Weight Calculator](https://captaincalc.xyz/calculator/ideal-body-weight-calculator/): Calculate your ideal body weight using Hamwi, Devine & Robinson formulas. Get a realistic goal weight range based on height, sex & frame size — not B… - [Protein Intake Calculator for Muscle Gain](https://captaincalc.xyz/calculator/protein-intake-calculator/): Calculate your optimal daily protein intake for muscle gain using bodyweight, lean mass, activity level, and goal. Get precise gram targets instantly. - [Waist-to-Hip & Waist-to-Height Ratio Calculator](https://captaincalc.xyz/calculator/waist-to-hip-ratio-calculator/): Free waist-to-hip & waist-to-height ratio calculator. Enter your measurements and get instant body fat distribution risk zone feedback based on WHO g… - [Calories Burned During Workout Calculator](https://captaincalc.xyz/calculator/calories-burned-workout-calculator/): Calculate calories burned during 56+ exercises using MET values, your weight, and workout duration. Instant, science-based results for any fitness go… - [Plate Loading Barbell Calculator](https://captaincalc.xyz/calculator/plate-loading-calculator/): Plate Loading Barbell Calculator — enter a target weight, pick Olympic or standard bar, and instantly see which plates go on each side. Lbs and kg su… - [Weekly Progressive Overload Planner](https://captaincalc.xyz/calculator/progressive-overload-calculator/): Use this free Weekly Progressive Overload Planner to map out weight and rep increases for any lift. Drive steady strength and muscle gains with a per… - [Calorie Deficit & Fat-Loss Timeline Calculator](https://captaincalc.xyz/calculator/calorie-deficit-calculator/): Calculate your daily calorie deficit, safe fat-loss timeline, and milestone roadmap based on your weight, height, age, and activity level. Free, scie… ## Articles - [How to Keep Your Personal Number Private with g100.us](https://captaincalc.xyz/keep-personal-number-private-g100us/): Want to keep your personal number private? g100.us gives you a separate business number for calls, SMS & WhatsApp in 100+ countries, live in seconds. - [How to Send SMS and OTPs Online Instantly With g100.us](https://captaincalc.xyz/send-sms-otp-online-g100us/): Send SMS and receive OTPs online fast with a g100.us virtual business number. Step-by-step setup, instant activation, flat pricing, 100+ countries. - [The Complete Pre-Workout Body Stats Checklist for Tracking Real Progress](https://captaincalc.xyz/body-stats-tracking-checklist/): Track real fitness progress with this body stats checklist: weight, body fat %, measurements, BMR, strength benchmarks, and the right calculator for … - [Inside the Calorie Math: A Deep Dive Into How TDEE Formulas Are Built](https://captaincalc.xyz/how-tdee-formulas-are-built-deep-dive/): Understand the math behind TDEE: how Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle differ, what populations they were built from, and which equ… - [Cutting vs Bulking: How to Use a Macro Calculator to Pick the Right Phase](https://captaincalc.xyz/cutting-vs-bulking-macro-calculator/): Learn how to choose between cutting, bulking, or maintenance and use a macro calculator to set your calories and macros for each phase effectively. - [10 Quick Tips to Get More Accurate Numbers From Any Fitness Calculator](https://captaincalc.xyz/tips-accurate-fitness-calculator-numbers/): Get more accurate results from any fitness calculator with 10 quick tips on consistent measuring, activity multipliers, and avoiding common input err… - [Your One-Rep Max Questions, Answered: Estimating Strength Without Maxing Out](https://captaincalc.xyz/one-rep-max-questions-answered/): Learn how to estimate your 1RM using the Epley and Brzycki formulas, how accurate 1RM calculators are, and how to use your number to program lifts by… - [BMR Explained Like You're Five: The Calories Your Body Burns Doing Nothing](https://captaincalc.xyz/bmr-explained-like-youre-five/): What is BMR and what does your calculator result actually mean? Plain-English explanation of Basal Metabolic Rate, what drives it, and how to use the… - [Skinny-Fat to Lean: How Body Recomposition Tracking Actually Works](https://captaincalc.xyz/skinny-fat-to-lean-recomposition-journey/): There's a common number people don't expect to see when they first run an online body composition calculator: a body fat percentage in the low 30s, a… - [The Science of Protein Intake: How Much You Really Need to Build Muscle](https://captaincalc.xyz/protein-intake-build-muscle-science/): What does the research actually say about protein for muscle building? Leucine thresholds, per-kg targets, and how a protein calculator turns studies… - [7 Body-Composition Myths That Are Sabotaging Your Progress](https://captaincalc.xyz/body-composition-myths-sabotaging-progress/): Debunking 7 body-composition myths — from spot reduction to BMI — with calculator-driven reality checks that reveal what's actually happening in your… - [BMI vs Body Fat Percentage: Which One Actually Tells You If You're Healthy?](https://captaincalc.xyz/bmi-vs-body-fat-percentage/): BMI vs body fat percentage: a head-to-head comparison of what each measures, where each fails, and which fitness calculator to actually trust for you… - [What Your TDEE Actually Means and Why It's the Foundation of Every Fitness Goal](https://captaincalc.xyz/what-tdee-means-fitness-foundation/): Learn what TDEE really means, how BMR, TEF, NEAT, and exercise combine to set your energy needs, and how to use a TDEE calculator to cut, bulk, or ma… - [How to Calculate Your Body Fat Percentage at Home (No Fancy Equipment Needed)](https://captaincalc.xyz/calculate-body-fat-percentage-at-home/): Learn 3 practical at-home methods to calculate body fat percentage — Navy tape method, BMI formula, and skinfold calipers — with step-by-step instruc… ## About & Policies - [About Us](https://captaincalc.xyz/about-us/) - [Contact Us](https://captaincalc.xyz/contact-us/) - [Terms of Service](https://captaincalc.xyz/terms-of-service/) - [Disclaimer](https://captaincalc.xyz/disclaimer/) - [Privacy Policy](https://captaincalc.xyz/privacy-policy/) ## Notes - Full URL list: https://captaincalc.xyz/sitemap.xml - Content is original and maintained by Captain Physique. 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