BMI Calculator
Calculate body mass index using metric or US units and read what the result can and cannot tell you.
Open tool →Free tools for everyday food decisions
Nutrition calculators for everyday questions.
Explore free body measurement calculators, calorie and macro estimators, kitchen converters and practical meal-planning tools. Each tool is designed to make its method and limitations easy to understand.
Browse all calculators ↓ Explore everyday guidesFree to useNo signupClear assumptionsEducational information
All calculators and tools
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Body measurements
Height Converter
Convert centimetres, metres, feet and inches for everyday measurements.
Open tool →Weight Converter
Convert kilograms, pounds and stones using standard unit conversions.
Open tool →Calories & energy
BMR Calculator
Estimate basal metabolic rate with a documented equation and clearly stated assumptions.
Open tool →Daily Calorie Calculator
Estimate daily energy needs using age, measurements and an activity-level assumption.
Open tool →Macro Calculator
Convert a calorie total and selected macronutrient percentages into approximate grams.
Open tool →Calories per Serving Calculator
Add calorie values you know for recipe ingredients and divide the total by servings.
Open tool →Nutrition & everyday tracking
Water Intake Tracker
Log water consumed against a goal you choose. The tool is a tracker, not a medical hydration prescription.
Open tool →Weekly Meal Planner
Create a simple editable weekly meal outline and shopping list around your preferences.
Open tool →Cooking, conversions & meal planning
Recipe Scaling Calculator
Scale ingredient quantities up or down when you change the number of servings.
Open tool →Cost per Serving Calculator
Estimate the cost per portion using ingredient prices you enter.
Open tool →Kitchen Unit Converter
Convert common cooking volumes and temperatures. Ingredient-specific cup-to-gram values vary.
Open tool →No matching tools found. Try another search or choose “All categories”.
Learn how the numbers work
Helpful context can make calculator results easier to understand.
Balanced Meals: A Practical Guide
Explore variety, flexible portions and ways to build satisfying everyday meals.
Read guide →Budget-Friendly Meal Planning
Plan around pantry staples, ingredient prices, leftovers and grocery lists.
Read guide →Meal Prep for Busy Weeks
Learn practical batch-cooking, storage and preparation techniques.
Read guide →How to use DietDelta calculators
Check the method
Each calculator should explain its formula, units and assumptions. Results based on estimates or user-entered values may not match real-world measurements exactly.
Use results in context
These tools provide general educational information, not diagnosis or individualized medical nutrition therapy. For personal health concerns, consult a qualified healthcare professional.
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Frequently asked questions
Quick answers about the tools on this page.
Are DietDelta calculators free?
Yes. The calculators listed here are intended to be free to use, with no account required for the tools currently offered.
Are calculator results medical advice?
No. Results are educational estimates based on stated methods and user-entered information. They do not diagnose a health condition or replace advice from a qualified professional.
How accurate are nutrition estimates?
Accuracy depends on the formula, the quality of the values entered and individual variation. Read the method and limitations on each tool page and treat estimates as approximate.
Do I need to create an account?
No account is required for the tools currently offered on DietDelta.