---
title: "Unit Converters: Length, Weight, Temperature & Currency"
description: "Convert length, weight, temperature, units and currencies. Check metric versus imperial conventions and the difference between fixed factors and dated rates."
url: "https://worldcalculators.org/calculators/conversion/"
canonical: "https://worldcalculators.org/calculators/conversion/"
---

# Conversion calculators

Convert length, weight, temperature, units and currencies. Check metric versus imperial conventions and the difference between fixed factors and dated rates.

## Everyday measurements

Convert lengths, weights and temperatures with the right unit labels. Keep enough precision for your purpose and round once at the end.
mm, cm, m, km, in, ft, yd, miles, nautical miles, furlongs — 17 units

## Money, time and digital units

Check the date or convention as well as the number. Currency reference rates, time zones and digital unit prefixes require different assumptions.
Convert 28 currencies with ECB reference rates when available — dated snapshot fallback, not a bank quote

## Avoid converting the wrong dimension

One metre is 100 centimetres, but one square metre is 10,000 square centimetres. Area factors are squared and volume factors are cubed. Similarly, a temperature difference has a different conversion from an absolute Celsius or Fahrenheit reading.

## Precision is not the same as accuracy

More displayed decimals cannot improve an imprecise measurement. Preserve intermediate precision, then round to match the measurement or specification. For currency, check the displayed source and date and account for provider spreads and fees separately.

## Sources & Methodology

This topic page helps you choose a tool. Read the individual calculator’s assumptions, source dates and limitations before relying on its estimate.
Looking for something else? Search the full directory or choose your country .

Source: https://worldcalculators.org/calculators/conversion/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.