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General & Health Calculators

BMI, calorie, age, tip, percentage, concrete, grade, GPA and everyday calculators. All free, no signup, works on any device.

⭐ Popular General Calculators
Most-used everyday and health calculators
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Tip Calculator

Bill split + 2026 US tipping norms

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Age Calculator

Exact age in years, months, days

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Percentage Calculator

All 4 types of % calculation

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Concrete Calculator

Bags of cement for any project

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Grade Calculator

GPA and weighted grade average

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Date Calculator

Days between dates + add/subtract

All 22 General & Health Calculators — A to Z
Complete list of every general and health calculator on Calculator200.com

General Calculator FAQs

Which BMI thresholds are used for Indian users?
We show WHO standard (Overweight: 25+) AND India-specific ICMR thresholds (Overweight: 23+, Obese: 27.5+). Indians develop metabolic complications at lower BMI — per ICMR guidelines and Lancet research.
Is the tip calculator updated for 2026 US norms?
Yes — 2026 US tipping context: 15% acceptable, 18% good, 20% excellent at sit-down restaurants. Counter service optional. Based on Pew Research 2024 and Cornell Hospitality Research data.
Which calorie formula is used?
Mifflin-St Jeor formula — most accurate for diverse populations per Academy of Nutrition and Dietetics. Shows all 5 activity levels. Real accuracy range: ±200 kcal/day.
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