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Calculators that just work.

A precise, fast, dark-mode-first toolkit for everyday finance, health and math. Every number runs entirely in your browser.

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All calculators

Six tools built for clarity. More on the way.

Monthly EMI for home, car or personal loans.

Add or remove GST at 5%, 12%, 18% or 28%.

Income Tax (India)

FY 2024-25 — new vs old regime estimate.

Body Mass Index with category guidance.

Exact age in years, months and days.

Percentage Calculator

% of a number, % change, marks %.

Macronutrient Calculator

TDEE-based protein, carbs & fat for cut, bulk, maintenance or keto.

Read the guides

In-depth articles on macros, training and nutrition.

Counting macros for beginners

A 4-week ramp-up plan, scales, apps and habits.

Macros for weight loss

40 / 30 / 30 in depth with worked examples.

Macros for muscle gain

Lean-bulk surplus, protein timing, training-day macros.

70 / 25 / 5, net carbs, electrolytes & keto flu.

All articles →

15 deep-dive guides on every aspect of macros.

Why CalcHub

Every calculator runs entirely in your browser — your inputs never leave your device. Pages are static HTML, so they load in under a second even on slow networks.

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