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Age Calculator
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Percentage Calculator
Calculate percentages, increases, decreases, and percentage differences.
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Body Mass Index calculator with healthy weight ranges and visual feedback.
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GPA Calculator
Calculate semester and cumulative GPA across multiple grading systems.
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Loan EMI calculator with full amortization schedule and payment breakdown.
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Estimate the future value of a Systematic Investment Plan with monthly contributions.
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Track attendance percentage and calculate classes needed to meet requirements.
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Read up on the math.
General Math 7 min read
The Percentage Formula, Explained from First Principles
Most people remember the formula but forget what it means. Here is the percentage operation, the four common variations, and the mental shortcuts to compute them in your head.
Read article Health 6 min read
How BMI is Calculated (and What the Number Actually Tells You)
A clear, no-jargon walkthrough of the BMI formula, the WHO categories, and the limits of using a single number to describe your body.
Read articleQuestions, answered.
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All formulas are implemented from authoritative sources (WHO for BMI, standard reducing-balance for EMI, ISO units for conversions). Each calculator page documents its formula and method so you can verify it yourself.
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