Convert Pennyweight to Ratti
Convert pennyweights to rattis instantly. 1 pennyweight = 12.7997843621 ratti — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ratti to Pennyweight converter for the reverse conversion.
Units explained
Pennyweight
The pennyweight (dwt) equals one-twentieth of a troy ounce, 24 grains (about 1.555 g).
From the mass of a medieval English silver penny; symbol dwt from 'denarius weight'.
Jewelry making and precious-metal scrap valuation in the US.
Derived from the medieval English coinage system.
Ratti
The ratti equals about 0.1215 gram, the smallest traditional South Asian weight.
Based on the seed of the Gunja plant (Abrus precatorius), or 'raktika' in Sanskrit.
Gemstones and gold in Indian and South Asian jewelry.
One of the oldest weight units of the Indian subcontinent, later standardized.
Pennyweight to Ratti conversion formula
Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.
The relationship between pennyweights and rattis:
To convert pennyweights to rattis, multiply the value in pennyweights by 12.7997843621. To reverse, multiply rattis by 0.0781263162.
How to use this converter
Type a value into the calculator. The result in rattis updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Ratti to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to rattis
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 12.7997843621.
- The product is the equivalent value in rattis (ratti).
- To reverse, multiply the ratti value by 0.0781263162.
Worked examples
Example 1 — Convert 1 dwt to ratti:
1 × 12.7997843621 = 12.7997843621 ratti
Example 2 — Convert 100 dwt to ratti:
100 × 12.7997843621 = 1279.978436214 ratti
Real-world example — Adjacent small-scale precision
One pennyweight equals 1,000 rattis — 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 dwt × 12.7997843621 = 12.7997843621 ratti
Real-world example — Adjacent metric sub-units
One pennyweight equals 1,000 rattis. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 dwt × 12.7997843621 = 12.7997843621 ratti
Pennyweight to Ratti conversion table
Standard reference values for converting pennyweights to rattis:
| Pennyweight [dwt] | Ratti [ratti] |
|---|---|
| 0.01 | 0.1279978436 |
| 0.1 | 1.2799784362 |
| 1 | 12.7997843621 |
| 2 | 25.5995687243 |
| 3 | 38.3993530864 |
| 4 | 51.1991374486 |
| 5 | 63.9989218107 |
| 10 | 127.9978436214 |
| 20 | 255.9956872428 |
| 30 | 383.9935308642 |
| 40 | 511.9913744856 |
| 50 | 639.989218107 |
| 100 | 1279.978436214 |
| 500 | 6399.89218107 |
| 1000 | 12799.7843621399 |
Frequently asked questions
How many rattis is 1 pennyweight?
How do I convert pennyweights to rattis?
How do I convert rattis back to pennyweights?
How many rattis is 100 pennyweights?
Popular weight unit conversions
Convert Pennyweight to other weight units
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Metric / SI (18 units)
Avoirdupois (15 units)
Troy & Apothecary (9 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 dwt = 12.7997843621 ratti) 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 Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.