# Grams to Grains (g to grain)

> Convert grams to grains: 1 g = 15.4324 grain. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `grams-to-grains` · Quantity: Mass (`mass`, base unit kg) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/grams-to-grains · This document: https://tttkmbb.com/conversion/grams-to-grains.md · JSON: https://tttkmbb.com/conversion/grams-to-grains.json (add `?value=` for a result)

## Formula

- `1 g = 15.4324 grain`
- `grains = grams × 15.43235835`
- Reverse: `grams = grains × 0.06479891`

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 g = 77.1618 grain
- 12.5 g = 192.904 grain
- 100 g = 1543.24 grain

## Conversion table

| Grams (g) | Grains (grain) |
| --- | --- |
| 1 | 15.4324 |
| 2 | 30.8647 |
| 3 | 46.2971 |
| 4 | 61.7294 |
| 5 | 77.1618 |
| 6 | 92.5942 |
| 7 | 108.027 |
| 8 | 123.459 |
| 9 | 138.891 |
| 10 | 154.324 |
| 15 | 231.485 |
| 20 | 308.647 |
| 25 | 385.809 |
| 30 | 462.971 |
| 40 | 617.294 |
| 50 | 771.618 |
| 75 | 1157.43 |
| 100 | 1543.24 |
| 200 | 3086.47 |
| 250 | 3858.09 |
| 500 | 7716.18 |
| 1000 | 15432.4 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=g&to_unit=grain` → 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":"g","to_unit":"grain"}`
- All mass units: https://tttkmbb.com/api/v1/units?quantity=mass · full converter: [Mass / Weight Converter](https://tttkmbb.com/conversion/mass.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many grains are in one gram?**

1 g = 15.4324 grain. 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 grams to grains?**

Multiply the value in grams by 15.43235835: grains = grams × 15.43235835. For example, 5 g = 77.1618 grain.

**How do I convert grains back to grams?**

Multiply by the inverse factor 0.06479891 (grams = grains × 0.06479891), or use the grains-to-grams page.

## Related conversions

- [Grains to grams](https://tttkmbb.com/conversion/grains-to-grams.md) (reverse)
- [Kilograms to Pounds](https://tttkmbb.com/conversion/kg-to-lbs.md)
- [Pounds to Kilograms](https://tttkmbb.com/conversion/lbs-to-kg.md)
- [Grams to Ounces](https://tttkmbb.com/conversion/grams-to-oz.md)
- [Ounces to Grams](https://tttkmbb.com/conversion/oz-to-grams.md)
- [Kilograms to Stone](https://tttkmbb.com/conversion/kg-to-stone.md)
- [Stone to Kilograms](https://tttkmbb.com/conversion/stone-to-kg.md)
- [Pounds to Ounces](https://tttkmbb.com/conversion/lbs-to-oz.md)
- [Ounces to Pounds](https://tttkmbb.com/conversion/oz-to-lbs.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)