All Calculators

💳

Loan Calculator

Monthly payment, total interest, and full amortization.

Finance

🏠

Mortgage Calculator

Home loan payments with taxes/insurance options.

Finance

🧓

Retirement Calculator

Project retirement savings, contributions, and timeline.

Finance

💼

Salary Calculator

Estimate net pay from gross salary and deductions.

Finance

💹

Compound Interest Calculator

Project your balance with compounding by day, month, or year.

Finance

💱

Currency Calculator

Convert currencies with live rates (FreeCurrencyAPI).

Finance • Converter

➗

Percentage Calculator

Find % of a number, percentage change, and part/whole.

Math

🧮

Fraction Calculator

Add, subtract, multiply, divide, and reduce fractions.

Math

📐

Greatest Common Factor (GCF)

Find the largest integer dividing two or more numbers.

Math

📊

Standard Deviation

Compute population/sample SD, variance, and mean.

Math

🔺

Triangle Calculator

Solve sides, angles, area, and perimeter with steps.

Math

🧠

Scientific Calculator

Full scientific functions for quick computations.

Math

🎂

Age Calculator

Exact age in years, months, days—plus upcoming birthday.

Time & Date

📅

Date Calculator

Add/subtract days and find days between dates.

Time & Date

⏳

Countdown Timer

Start a countdown to any date/time with alerts.

Time & Date

🕘

Time Card Calculator

Weekly hours with breaks, overtime, and export.

Time & Date

⏱️

Time Duration Calculator

Compute precise time differences between timestamps.

Time & Date

🌍

Time Zone Calculator

Convert times across world time zones with DST awareness.

Time & Date • Converter

⚖️

BMI Calculator

Body Mass Index and weight category by height & weight.

Health

🥗

Calorie Calculator

Daily calories using activity level and BMR formulas.

Health

🔥

BMR Calculator

Basal Metabolic Rate via Mifflin, Harris-Benedict, Katch.

Health

📏

Body Fat Calculator

Estimate body fat % via multiple supported methods.

Health

🎯

Ideal Weight Calculator

Healthy weight ranges based on height (common formulas).

Health

❤️

Target Heart Rate Calculator

Training zones from resting & max heart rate estimates.

Health

📐

Area Conversion Calculator

Convert between m², ft², acres, hectares, and more.

Converter

📏

Length Conversion Calculator

Switch between metric and imperial length units.

Converter

🌡️

Temperature Conversion Calculator

Convert °C, °F, and K with explanations.

Converter

🧪

Volume Conversion Calculator

Common kitchen and engineering volume units.

Converter

🏋️

Weight Conversion Calculator

Quickly convert kg, lb, oz, and more.

Converter

🚀

Speed Conversion Calculator

Convert between km/h, mph, m/s, and knots.

Converter

🧱

Concrete Calculator

Concrete volume, bag counts, and mix guidance.

Construction

🏠

Square Footage Calculator

Area for rooms & projects in ft² or m².

Construction

🛣️

Asphalt Calculator

Estimate asphalt tons by area and depth.

Construction