How accurate is this calculator?

It uses a simplified formula suitable for estimates. For precise times use official almanac or astronomical APIs.

Can I use a city name instead of coordinates?

This version uses latitude and longitude. You can look up coordinates for your city and enter them.

Calculate sunrise and sunset times for any date and location (latitude/longitude) using a simple formula.

Date

Latitude

Longitude

How accurate is this calculator?: It uses a simplified formula suitable for estimates. For precise times use official almanac or astronomical APIs.
Can I use a city name instead of coordinates?: This version uses latitude and longitude. You can look up coordinates for your city and enter them.

Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly. Free temperature converter.

Tip Calculator

Calculate tip and split the bill. Enter bill amount, tip percentage, and number of people.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999.

Combinations Calculator

Calculate C(n,r) — the number of ways to choose r items from n without order. Uses n!/(r!(n-r)!).

Combinations with Replacement Calculator

Calculate the number of ways to choose r items from n with repetition allowed. Formula: C(n+r-1, r).

Even Permutations Calculator

Count how many permutations of n objects are even (expressible as an even number of swaps). For n ≥ 2, equals n!/2.