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Hundreds of free, expertly built calculators and online tools for finance, health, math, everyday life, Christmas, Islamic, Hindu, text, images, PDFs, developers and more — all running in your browser with no tracking.
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Calculators on the left for every life decision; on the right, online tools for text, images, PDFs, developers and design.
Featured calculators
The most-used calculators on CalcaTools — useful, fast, and accurate.
Calculadora hipotecaria | Calcula las cuotas mensuales de un préstamo hipotecario
Estimate monthly mortgage payments with taxes and insurance.
Calculadora del IMC | Calcula tu IMC y descubre tu categoría de peso
Check your Body Mass Index and healthy weight range.
Calculadora de préstamos | Calcula la cuota mensual y el interés total
Calculate loan payments, interest and full amortization.
Calculadora de porcentajes | Resuelve «X % de Y» y la variación porcentual
Calculate percentages, increases, decreases and ratios.
Calculadora de interés compuesto | Calcula el crecimiento de tus ahorros a lo largo del tiempo
See how your investments grow with compound interest.
Calculadora de edad | Obtén la edad exacta entre dos fechas
Calculate exact age in years, months, days and seconds.
Calculadora del zakat | Calcula el 2,5 % del zakat con un desglose de los activos
Compute your annual Zakat with the latest Nisab value.
Calculadora de kundali | Calcula el kundali a partir de los datos de nacimiento
Generate a Vedic Janma Kundali with Lahiri Ayanamsa.
Featured tools
The most-used online tools on CalcaTools — text utilities, image work, PDFs, code helpers and generators.
Contador de palabras | Cuenta palabras, caracteres, frases y tiempo de lectura
Real-time word, character and reading-time counter for any text.
Generador de contraseñas | Crea contraseñas seguras y aleatorias de forma local
Build strong random passwords with length and symbol controls.
Generador de códigos QR | Crea códigos QR para URL, texto y Wi-Fi
Generate downloadable QR codes for URLs, vCards, Wi-Fi and more.
Compresor de PDF | Reduce el tamaño de los archivos PDF de forma local sin pérdida de calidad
Shrink PDF file size in your browser — no upload needed.
Formateador de JSON | Formatear, validar y minimizar archivos JSON de forma local
Format, validate and minify JSON with syntax highlighting.
Selector de colores | Selecciona colores y copia valores HEX, RGB, HSL y CSS
Pick colors and copy HEX / RGB / HSL / OKLCH values.
Convertidor de temperatura | Convierte grados Celsius, Fahrenheit y Kelvin
Convert temperatures between Celsius, Fahrenheit and Kelvin.
Compresor de imágenes | Reduce el tamaño de los archivos JPG, PNG y WebP de forma local
Compress JPG / PNG images client-side to save bandwidth.
Expert Guides & Insights
Detailed tutorials, calculator breakdowns, and expert explanations of our formulas.
Calculadora de grava: calcula fácilmente el tonelaje y las yardas cúbicas
I remember standing in my driveway a few years ago, staring at a pile of gravel that looked like a small mountain. I had ordered twelve tons of crushed stone because I “eyeballed” the measurements. By the time I finished spreading it, I had a two-foot-high surplus sitting on my lawn. It killed the grass, […]
Calculadora del tipo de complexión: Guía para medir la altura y el peso
Recuerdo estar de pie frente al espejo de un probador hace tres años, con un par de pantalones chinos «slim-fit» que se negaban a pasar de mis muslos. Según mi altura y mi peso, la tabla de tallas indicaba que deberían quedarme perfectos. No tenía sobrepeso. Simplemente tenía una complexión diferente a la del modelo […]
Calculadora de rocas para jardinería: calcula las necesidades de tu proyecto
I remember the first time I tried to “eyeball” a gravel delivery for my side yard. I figured three truckloads would be plenty. When the driver dumped the piles, I realized I had enough stone to pave my driveway twice over, but barely enough to cover the actual muddy path I was trying to fix. […]
Cómo calcular tu edad exacta en años, meses y días (método manual + ejemplos)
Ever tried to figure out exactly how old you are for a legal form or a milestone celebration? Just subtracting years isn’t enough. If you want the precise breakdown of years, months, and days, you need a specific math technique called the borrowing method. It is the same logic used by computer software, but you […]
Live market prices
Track crypto, stocks, indices, commodities and forex in one clean live board — auto-updating, free, no signup.
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Prices are indicative, may be delayed up to ~15 minutes, and are for information only — not financial advice. Crypto data by CoinGecko; equities/indices by Yahoo Finance.
Why use CalcaTools
Trusted by thousands of users for everyday calculations — built by people who actually use the tools.
Expert-reviewed formulas
Health, finance, religious and astronomical formulas are reviewed by a named in-house panel and re-checked every quarter.
100% private, in-browser
Every calculation runs client-side. Your inputs never leave your device — no accounts, no logs, no third-party sharing.
Fast and responsive
Compiled CSS, lazy fonts, no Tailwind CDN — every page loads in under a second on a 4G phone connection.
Cited sources, full methodology
Each tool documents the exact formula and links to an authoritative source — CFPB, WHO, NIST, ISKCON, Hilal Committee, and more.