Free BMR Calculator for Weight Loss 2026
Use your BMR to calculate the calorie deficit needed for weight loss. To lose 1 pound per week, you need a deficit of 3,500 calories/week (500 calories/day). To lose 2 pounds per week, you need a 7,000 calorie/week deficit. However, never eat below your BMR — doing so puts your body in starvation mode and slows metabolism. Your safe minimum caloric intake should be your BMR, with a deficit created by exercise. No sign-up required — your data never leaves your browser. Works instantly on desktop, tablet, and mobile. Completely free with no daily usage limits, no watermarks, and no account needed. Trusted by students, professionals, and businesses worldwide. FixFlowHub is a browser-based toolbox with 120+ free utilities covering PDF, image, text, calculator, and productivity tools.
Frequently Asked Questions
How many calories below BMR is safe for weight loss?
You should never eat below your BMR. Create your calorie deficit by eating between your BMR and TDEE (Total Daily Energy Expenditure). A safe deficit is 300-500 calories below TDEE per day. Going too low causes muscle loss, fatigue, nutrient deficiencies, and metabolic slowdown.
How fast can I safely lose weight?
Safe weight loss is 0.5-2 pounds (0.25-1 kg) per week. Losing more than 2 pounds/week typically means losing muscle mass in addition to fat, which slows your metabolism long-term. Gradual, sustainable weight loss leads to better long-term results than crash dieting.