Does this use live exchange rates?

No. You enter the exchange rate (or use the demo rates shown). Useful for planning with a known rate.

How do I get the rate?

Check your bank or a forex site for the rate, then enter it. The tool converts amount × rate (or ÷ rate for the other direction).

Convert amount between currencies. Enter amount, from/to currency codes, and exchange rate (no API; user-provided or demo rates).

Amount

From currency

To currency

Custom rate (optional, 1 from = ? to)

Does this use live exchange rates?: No. You enter the exchange rate (or use the demo rates shown). Useful for planning with a known rate.
How do I get the rate?: Check your bank or a forex site for the rate, then enter it. The tool converts amount × rate (or ÷ rate for the other direction).

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.