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Wind Speed Converter
Tool Description
Wind Speed Converter is an online wind speed unit converter that supports mutual conversion between meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots (kn), feet per second (ft/s), and Beaufort scale (Bft). Enter any value and unit to instantly view the corresponding results in all other units. Suitable for weather observation, maritime aviation, outdoor sports, engineering calculations, and more.
How to Use
- Enter a Value
Type the wind speed value you want to convert, supporting integers and decimals, e.g.,
10,0.5,3(Beaufort scale uses integer levels) - Select Source Unit
Choose the wind speed unit of your value from the dropdown (m/s/km/h/mph/kn/fts/Bft)
- View Results
Click the "Convert" button or press Enter, and the result area below will display the corresponding values in all units. Each result has a copy button for convenience.
Use Cases
- Weather forecast interpretation: Weather forecasts commonly use m/s or km/h for wind speed, but different countries have different conventions. For example, China uses m/s, Japan uses km/h, and the US uses mph. Use this tool to quickly convert to your familiar unit for a more intuitive understanding of wind strength.
- Maritime and aviation navigation: Knots (kn) are the standard speed unit in maritime navigation, and are also commonly used in aviation. When you need to convert between km/h or m/s and knots, this tool provides precise conversion results.
- Outdoor activity planning: Cycling, running, sailing, paragliding, and other outdoor activities are greatly affected by wind speed. This tool helps you quickly convert wind speed data from different sources (e.g., sports apps showing km/h, weather stations providing m/s) to plan activities appropriately.
Core Advantages
- Daily Free Quota
Free usage is provided to every user every day, covering everyday lightweight conversions at zero cost. Open and use instantly without installation.
- Privacy & Security
All conversions are performed locally in your browser. Your data never leaves your device, giving you 100% privacy protection.
- Wide Unit Coverage
Covers m/s, km/h, mph, kn, ft/s, and the Beaufort scale (Bft) — 6 commonly used units in total. One input instantly returns all results.
- Accurate Results
Uses international standard conversion factors and high-precision floating-point arithmetic, with smart decimal rounding for trustworthy results.
- One-Click Copy
Every result comes with a copy button on the right. Click to copy the value for easy pasting into documents, spreadsheets, or chat tools.
Wind Speed Unit Conversion Relationships
The following shows the conversion relationships between wind speed units, with meters per second (m/s) as the base unit:
| Unit Name | Abbr. | Conversion Relationship | Equivalent m/s |
|---|---|---|---|
| Meter per Second | m/s | 1 m/s（基准单位） | 1 |
| Kilometer per Hour | km/h | 1 km/h ≈ 0.277778 m/s | 0.277778 |
| Mile per Hour | mph | 1 mph ≈ 0.44704 m/s | 0.44704 |
| Knot | kn | 1 kn ≈ 0.514444 m/s | 0.514444 |
| Foot per Second | ft/s | 1 ft/s = 0.3048 m/s | 0.3048 |
Beaufort Scale Reference Table
The Beaufort Scale is an international standard for wind force classification, dividing wind into 13 levels (0-12) based on the effect of wind on land objects. The following shows the correspondence between Beaufort scale levels and wind speed:
| Level | Name | m/s Range | km/h Range | Land Phenomenon |
|---|---|---|---|---|
| 0 | Calm | 0 ~ 0.2 | < 1 | Smoke rises vertically |
| 1 | Light Air | 0.3 ~ 1.5 | 1 ~ 5 | Smoke drift indicates wind direction, wind vanes do not move |
| 2 | Light Breeze | 1.6 ~ 3.3 | 6 ~ 11 | Wind felt on face, leaves rustle, wind vanes move |
| 3 | Gentle Breeze | 3.4 ~ 5.4 | 12 ~ 19 | Leaves and small twigs in constant motion, flags extended |
| 4 | Moderate Breeze | 5.5 ~ 7.9 | 20 ~ 28 | Raises dust and loose paper, small branches move |
| 5 | Fresh Breeze | 8.0 ~ 10.7 | 29 ~ 38 | Small trees in leaf begin to sway, small wavelets on inland waters |
| 6 | Strong Breeze | 10.8 ~ 13.8 | 39 ~ 49 | Large branches move, telephone wires whistle, umbrellas difficult to use |
| 7 | High Wind | 13.9 ~ 17.1 | 50 ~ 61 | Whole trees in motion, walking against wind is difficult |
| 8 | Gale | 17.2 ~ 20.7 | 62 ~ 74 | Twigs break off trees, significant resistance when walking |
| 9 | Strong Gale | 20.8 ~ 24.4 | 75 ~ 88 | Slight structural damage, chimney pots and roof tiles removed |
| 10 | Storm | 24.5 ~ 28.4 | 89 ~ 102 | Rare on land, trees uprooted, considerable structural damage |
| 11 | Violent Storm | 28.5 ~ 32.6 | 103 ~ 117 | Very rare on land, widespread damage |
| 12 | Hurricane | ≥ 32.7 | ≥ 118 | Extremely rare on land, devastating destruction |
Beaufort Scale and Wind Speed Relationship
The Beaufort Scale was created by British naval officer Francis Beaufort in 1805, initially used for describing sea conditions in navigation, later extended to land applications. The Beaufort scale is not a simple linear conversion but a discrete classification based on wind speed ranges. Each level corresponds to a specific wind speed interval. When converting from other units to the Beaufort scale, this tool uses the standard wind speed range matching method to determine the corresponding wind force level.
When converting from the Beaufort scale to other units, this tool uses the median wind speed value of that level's range as the representative wind speed. For example, level 5 has a wind speed range of 8.0~10.7 m/s, using the median value of 9.35 m/s as the representative value. Due to the discrete nature of the Beaufort scale, conversion results between different units are for reference only.
FAQ
Meter per second (m/s) is the standard SI unit of speed and the most commonly used wind speed unit in meteorology. 1 m/s means air moves 1 meter in 1 second. Weather forecasts in many countries use m/s for wind speed. For example, 2 m/s corresponds to light air, 10 m/s corresponds to level 5 fresh breeze.
A knot (symbol kn) is a speed unit commonly used in maritime and aviation contexts. 1 kn = 1 nautical mile per hour ≈ 1.852 km/h ≈ 0.5144 m/s. The name "knot" comes from the ancient method of measuring ship speed — sailors would throw a rope with knots tied at regular intervals into the water and count how many knots passed through their hands in a given time. In modern navigation, ship and aircraft speeds are typically expressed in knots.
The Beaufort Scale was created by British naval officer Francis Beaufort in 1805, dividing wind force into 13 levels from 0 to 12, based on the effect of wind on land or sea objects. Each level corresponds to a specific wind speed range: level 0 calm (0~0.2 m/s), level 1 light air (0.3~1.5 m/s), increasing progressively to level 12 hurricane (≥32.7 m/s). When converting, other units → Beaufort scale uses standard range matching, Beaufort scale → other units uses the median wind speed value for approximate conversion.
1 mph = 1.609344 km/h, 1 km/h ≈ 0.621371 mph. mph (miles per hour) is commonly used in the US and UK for traffic speed limits and weather forecasts. km/h (kilometers per hour) is the speed unit used in most countries. The conversion factor is based on the international standard: 1 mile = 1.609344 kilometers.
No. All conversion calculations are performed entirely in your browser locally using pure JavaScript math. Your input data never leaves your device, so please feel free to use it.
This tool uses JavaScript double-precision floating-point numbers (64-bit IEEE 754) for calculations, which is sufficiently accurate for most everyday scenarios. Except for the Beaufort scale, conversions between other units are based on precisely defined conversion factors (e.g., 1 mph = 0.44704 m/s) and are accurate within floating-point range. The Beaufort scale, being a discrete classification, uses median wind speed values for conversion, and results are for reference only. Up to 6 significant decimal places are retained, with excess digits automatically truncated.
It supports 6 wind speed units. These include meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots (kn), feet per second (ft/s), and the Beaufort scale (Bft). Enter a value in any unit and the rest are computed automatically, with the Beaufort level matched according to the standard range.
No registration or login is required. This tool provides you with free usage every day. Open the page and start using it right away, covering everyday lightweight conversions at zero cost. For higher frequency or larger workloads, you can upgrade to a membership to unlock more quota.
Yes. The page uses a responsive design and works well on mobile, tablet, and desktop browsers. On mobile, simply tap the input field, select a unit, and tap convert to see results, with the same workflow as on desktop.
km/h is used in most countries, while mph is mainly used in the US and UK. 1 mph = 1.609344 km/h, and 1 km/h ≈ 0.621371 mph. mph is commonly used for traffic speed limits and weather forecasts in the US and UK, while km/h is the standard speed unit in China and most other countries. This tool helps you quickly convert between the two.
Click the copy icon to the right of the result field. Each unit result comes with a copy button. Clicking it automatically copies the value to your clipboard, allowing one-click pasting into documents, spreadsheets, or chat windows without selecting text manually.
The Beaufort scale is an internationally recognized wind force standard. It divides wind into 13 levels (0-12), originally used to describe sea conditions in navigation and later extended to land applications. For example, level 0 is calm, level 5 is fresh breeze (8.0~10.7 m/s), and level 12 is hurricane (≥32.7 m/s). This tool automatically converts between the Beaufort scale and other wind speed units for easy reference in weather observation, navigation, and aviation.
Content last updated：2026-08-06
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