# Knots to Miles per hour (kn to mph)

> Convert knots to miles per hour: 1 kn = 1.15078 mph. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `knots-to-mph` · Quantity: Speed (`speed`, base unit m/s) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/knots-to-mph · This document: https://tttkmbb.com/conversion/knots-to-mph.md · JSON: https://tttkmbb.com/conversion/knots-to-mph.json (add `?value=` for a result)

## Formula

- `1 kn = 1.15078 mph`
- `miles per hour = knots × 1.150779448`
- Reverse: `knots = miles per hour × 0.8689762419`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded to 6 significant figures, the API returns up to 12.

## Worked examples

- 5 kn = 5.7539 mph
- 12.5 kn = 14.3847 mph
- 100 kn = 115.078 mph

## Conversion table

| Knots (kn) | Miles per hour (mph) |
| --- | --- |
| 1 | 1.15078 |
| 2 | 2.30156 |
| 3 | 3.45234 |
| 4 | 4.60312 |
| 5 | 5.7539 |
| 6 | 6.90468 |
| 7 | 8.05546 |
| 8 | 9.20624 |
| 9 | 10.357 |
| 10 | 11.5078 |
| 15 | 17.2617 |
| 20 | 23.0156 |
| 25 | 28.7695 |
| 30 | 34.5234 |
| 40 | 46.0312 |
| 50 | 57.539 |
| 75 | 86.3085 |
| 100 | 115.078 |
| 200 | 230.156 |
| 250 | 287.695 |
| 500 | 575.39 |
| 1000 | 1150.78 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=kn&to_unit=mph` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"kn","to_unit":"mph"}`
- All speed units: https://tttkmbb.com/api/v1/units?quantity=speed · full converter: [Speed Converter](https://tttkmbb.com/conversion/speed.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many miles per hour are in one knot?**

1 kn = 1.15078 mph. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

**What is the formula to convert knots to miles per hour?**

Multiply the value in knots by 1.150779448: miles per hour = knots × 1.150779448. For example, 5 kn = 5.7539 mph.

**How do I convert miles per hour back to knots?**

Multiply by the inverse factor 0.8689762419 (knots = miles per hour × 0.8689762419), or use the miles per hour-to-knots page.

## Related conversions

- [Miles per hour to knots](https://tttkmbb.com/conversion/mph-to-knots.md) (reverse)
- [Kilometers per hour to Miles per hour](https://tttkmbb.com/conversion/kmh-to-mph.md)
- [Miles per hour to Kilometers per hour](https://tttkmbb.com/conversion/mph-to-kmh.md)
- [Meters per second to Kilometers per hour](https://tttkmbb.com/conversion/meters-per-second-to-kmh.md)
- [Kilometers per hour to Meters per second](https://tttkmbb.com/conversion/kmh-to-meters-per-second.md)
- [Meters per second to Miles per hour](https://tttkmbb.com/conversion/meters-per-second-to-mph.md)
- [Miles per hour to Meters per second](https://tttkmbb.com/conversion/mph-to-meters-per-second.md)
- [Knots to Kilometers per hour](https://tttkmbb.com/conversion/knots-to-kmh.md)
- [Kilometers per hour to Knots](https://tttkmbb.com/conversion/kmh-to-knots.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)