Convert Inch to Twip
Convert inches to twips instantly. 1 inch = 1440 twip — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Twip to Inch converter for the reverse conversion.
Units explained
Inch
An inch is an Imperial and US customary unit of length defined since 1959 as exactly 25.4 millimeters (0.0254 meters). It is still the standard small unit of length in the United States, the United Kingdom (informally), and a few other countries.
The inch derives from the Roman uncia (one-twelfth of a foot) and survived through Anglo-Saxon and medieval English measurement systems. Various definitions persisted regionally until the 1959 International Yard and Pound Agreement standardized the inch globally as exactly 25.4 mm.
Inches are used in the US and UK for body height, screen sizes (TVs, monitors, phones), tire sizes, plumbing, lumber, paper sizes (US Letter is 8.5 × 11 in), and most consumer product specifications in the United States.
Anglo-Saxon origin (predating 1066); standardized to 25.4 mm exactly by the International Yard and Pound Agreement of 1959, signed by the US, UK, Canada, Australia, New Zealand, and South Africa.
Twip
A twip is a typographic unit equal to 1/1440 of an inch (about 17.64 µm). It is used in legacy Microsoft Windows graphics APIs and PostScript typography.
The name twip is a contraction of 'twentieth of a point' (point being 1/72 inch). Adopted in Microsoft's GDI and OLE specifications for screen-resolution-independent measurement.
Twips appear in Visual Basic, legacy Windows API code, and some PostScript-derived typesetting systems. They allow whole-number arithmetic at sub-pixel precision for typographic layout.
Adopted by Microsoft in the 1980s for screen-typography APIs; remains in use in legacy Windows GDI and Visual Basic code.
Inch to Twip conversion formula
The relationship between inches and twips:
To convert inches to twips, multiply the value in inches by 1440. To reverse, multiply twips by 0.0006944444.
How to use this converter
Type a value into the calculator. The result in twips updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Twip to Inch converter for the reverse direction.
Step-by-step: convert inches to twips
- Write down the value in inches (in).
- Multiply that value by the factor 1440.
- The product is the equivalent value in twips (twip).
- To reverse, multiply the twip value by 0.0006944444.
Worked examples
Example 1 — Convert 1 in to twip:
1 × 1440 = 1440 twip
Example 2 — Convert 100 in to twip:
100 × 1440 = 143999.9999999991 twip
Real-world example — Adjacent metric sub-units
One inch equals 1,000 twips. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 in × 1440 = 1440 twip
Real-world example — Adjacent small-scale precision
One inch equals 1,000 twips — the standard sub-millimeter precision conversion that materials engineers use whenever they switch between bulk material thickness specs (larger unit) and surface-finish characteristics (smaller unit).
1 in × 1440 = 1440 twip
Inch to Twip conversion table
Standard reference values for converting inches to twips:
| Inch [in] | Twip [twip] |
|---|---|
| 0.01 | 14.4 |
| 0.1 | 144 |
| 1 | 1440 |
| 2 | 2880 |
| 3 | 4320 |
| 4 | 5760 |
| 5 | 7200 |
| 10 | 14399.9999999999 |
| 20 | 28799.9999999998 |
| 30 | 43199.9999999997 |
| 40 | 57599.9999999996 |
| 50 | 71999.9999999995 |
| 100 | 143999.9999999991 |
| 500 | 719999.9999999953 |
| 1000 | 1439999.9999999907 |
Frequently asked questions
How many twips is 1 inch?
How do I convert inches to twips?
How do I convert twips back to inches?
How many twips is 100 inches?
Popular length unit conversions
Convert Inch to other length units
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 in = 1440 twip) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.