# zCalculators

> 500+ free online calculators for math, finance, health, statistics, and everyday life. Fast, accurate, and easy to use — no sign-up required.

zCalculators is a free collection of single-purpose web calculators. Each tool runs entirely in the browser, shows the formula and worked examples, and is embeddable on other sites.

## Categories

- [Finance Calculators](/category/finance): Loans, mortgages, investments, interest, taxes, and business finance.
- [Health Calculators](/category/health): BMI, calories, heart rate, body fat, pregnancy, and fitness.
- [Math Calculators](/category/math): Algebra, geometry, trigonometry, fractions, percentages, and conversions.
- [Statistics Calculators](/category/statistics): Probability, distributions, hypothesis tests, correlation, and sample size.
- [Everyday Calculators](/category/everyday): Tips, dates, time, unit conversions, and household tools.

## Popular Calculators

- [BMI Calculator](/calculator/bmi): Body Mass Index from height and weight.
- [Loan Calculator](/calculator/loan): Monthly payment, interest, and amortization.
- [Mortgage Calculator](/calculator/mortgage): Home loan payments with taxes and insurance.
- [Compound Interest Calculator](/calculator/compound-interest): Investment growth over time.
- [Percentage Calculator](/calculator/percentage): Percent of, percent change, and percent off.
- [Tip Calculator](/calculator/tip): Restaurant tips and bill splitting.
- [Age Calculator](/calculator/age): Exact age in years, months, and days.
- [Calorie Calculator](/calculator/calorie): Daily calorie needs from activity level.
- [Standard Deviation Calculator](/calculator/standard-deviation): Variance and spread of a dataset.
- [Future Value Calculator](/calculator/future-value): Lump-sum and annuity future value.

## Optional

- [Home](/): Search and browse all calculators.