Fitness Tools
Accurate, free fitness calculators to track calories burned, find your ideal weight, and hit your fitness goals. No signup, no ads, instant results.
Fitness Tools
06 entries
Calculate exactly how many calories you burn rucking based on your body weight, pack weight, distance, and pace. Uses validated MET values for accuracy.
↗ 02Calculate your Total Daily Energy Expenditure with the Mifflin-St Jeor equation, plus maintenance, cutting, and bulking calorie targets.
↗ 03Estimate your true 1RM from any submaximal set using the Epley, Brzycki, and Lander formulas — with a full training percentage chart.
↗ 04Estimate your body fat percentage, fat mass, and lean mass with the U.S. Navy circumference method — just a tape measure needed.
↗ 05Get your personalized daily water target based on body weight, exercise volume, and climate — in ounces, liters, and cups.
↗ 06Enter your height and a target BMI to instantly find the exact weight you need to reach your goal. Includes a visual BMI range indicator.
↗Most online fitness calculators are cluttered with ads, require you to create an account, or give generic results that don't account for your specific situation. Every calculator on ForgeYourFit is built to be fast, accurate, and genuinely useful — no fluff, no signup, no cost.
All calculators on this site use scientifically validated formulas and data sources. The rucking calorie calculator uses MET (Metabolic Equivalent of Task) values from published exercise science research. The reverse BMI calculator uses the standard WHO BMI formula. Results are estimates — individual variation, terrain, and fitness level can affect actual outcomes by 10 to 15 percent.