Free nutrition tools
Fast, free, no-sign-up calculators to take control of your nutrition. Based on validated formulas as a starting point — then Renzy helps you track it day to day.
Calorie calculator
How many calories to eat per day for your goal, with your TDEE and macro split.
Weight loss calculator
How long to reach your goal weight and the daily deficit you need.
Basal metabolic rate (BMR)
The calories you burn at rest and your total daily expenditure (TDEE).
Macro calculator
Your daily grams of protein, carbs and fat by goal and diet style.
Water intake calculator
How many liters of water to drink per day by weight, activity and climate.
Protein calculator
How many grams of protein per day by weight, goal and activity.
BMI calculator
Your Body Mass Index, WHO category and healthy weight range.
Ideal weight calculator
Your ideal weight by height and sex, with the classic formulas and your healthy range.
Body fat calculator
Your body fat percentage with the US Navy tape-measure method.
Waist-to-height ratio
Waist-to-height and waist-to-hip: abdominal-fat risk, better than BMI.
Calories burned
How many calories you burn walking, running, cycling or training.
One-rep max (1RM) calculator
Your one-rep max from a working set, with the %-of-1RM training table.
Heart rate & training zones
Your maximum heart rate and your 5 training zones (fat-burn, aerobic, threshold) in bpm.
Intermittent fasting calculator
Your eating window and your fasting window by protocol (16:8, 18:6, OMAD) and your first meal.
Muscle-gain calorie calculator
How many calories to eat per day to gain muscle: maintenance, surplus, protein and gain rate.
TDEE calculator
The calories you burn each day: estimated with a formula or your real number from what you eat and your weight.
Calorie deficit calculator
How much to eat to lose weight: your maintenance and the calories with a 250, 500, 750 or 1,000 kcal deficit.
Cooked to raw weight calculator
What your cooked food weighed raw (and the other way round): rice, pasta, legumes, meat and fish.
Steps to calories calculator
How many calories your steps burn by weight and pace, and how many are extra compared with resting.
Net carbs calculator
The net carbs on any label, US or European, without subtracting fiber twice.
Recipe calorie calculator
Adds up the raw ingredients and gives you calories, protein, carbs and fat per serving.
Meal planner template
Plan your 7 days and your shopping list, then save it as a PDF or print it.
Muscle mass calculator
Your muscle mass percentage by age and sex, compared with the MRI-measured average.
Cooking measurement converter
Convert cups, tablespoons and teaspoons to grams by ingredient (flour, sugar, rice, honey...).
Ovulation calculator
Your estimated ovulation and fertile days from your last period and cycle length.
Food calories
Search how many calories any food has, with protein, carbs and fat per 100 g.
Dish calories
Paella, döner kebab, schnitzel, lentil stew…: the calories in a serving, with the recipe gram by gram.
And after you calculate?
Knowing your numbers is step one. Renzy calculates them for you and then TRACKS them: photograph your food and see what’s left each day.
Keep Renzy in your pocket
Photograph your food and keep your calories, macros and progress always at hand.
App: 7 days free · card required · cancel anytime