How do I convert grains to grams?

Multiply grains by 0.06479891. Example: 55 gr × 0.06479891 = 3.563 g.

What is 100 grains in grams?

100 × 0.06479891 = 6.479891 g.

Where are grains (gr) used?

Common in ballistics/reloading, archery, and some jewelry measurements.

How do I convert grams back to grains?

Divide grams by 0.06479891 (or multiply by 15.4323584).

What is 55 grain bullet in grams?

55 gr × 0.06479891 = 3.563940 g (≈ 3.56 g).

Grains to Grams Converter

Convert grains to grams instantly for ammo reloading, archery, bullet weights, and powder charges. Get precise conversions in real time.

🎯 Quick Conversion: 1 grain = 0.0648 grams | 55 gr = 3.56 g | 150 gr = 9.72 g

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Grains to Grams Converter

Grains (gr)

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Grams (g)

Why Choose Our Grains to Grams Converter?

🎯 Professional Accuracy

Exact Conversion: Uses the legal definition: 1 grain = 0.06479891 grams
Precision: Results up to 6 decimal places for reloading accuracy
Real-time: Instant conversions as you type
Copy Function: Easy to copy results for your records

🏁 Real-World Uses

🔫 Ammo Reloading: Bullet weights, powder charges, and load calculations
🏹 Archery: Arrow weights, inserts, and component measurements
🎯 Hunting: Bullet weight conversions for different game
💎 Jewelry: Small mass measurements alongside carats

Common Conversion Examples

1 gr = 0.064799 g

1 grain = 0.06479891 grams

10 gr = 0.647989 g

10 grains = 0.6479891 grams

55 gr = 3.563940 g

55 grains = 3.563940 grams

100 gr = 6.479891 g

100 grains = 6.479891 grams

150 gr = 9.719836 g

150 grains = 9.719837 grams

300 gr = 19.439673 g

300 grains = 19.439673 grams

Grains to Grams: Formula and Quick Guide

Quick gr ⇄ g calculator for reloading, archery arrows, bullets, powder and jewelry. Get instant results with the exact formula.

Formula

grams = grains × 0.06479891
grains = grams ÷ 0.06479891

Unique example

A 150 gr hunting bullet weighs 150 × 0.06479891 = 9.719837 g (≈ 9.72 g).

Grains to Grams: Definition, History, Uses, and Examples

Definition

A grain (gr) is a traditional unit of mass used in ammunition reloading, archery, and jewelry. It is legally defined as exactly 64.79891 milligrams. A gram (g)is the SI unit of mass widely used in science and everyday measurements.

Grams (g) = Grains (gr) × 0.06479891
Grains (gr) = Grams (g) ÷ 0.06479891

Origin or History

The grain originated from the mass of a typical cereal grain. It became a common base unit across the troy, apothecaries, and avoirdupois systems. Modern standards fix the grain at 64.79891 mg, ensuring consistent conversions with grams.

Current Use

Ammo reloading: Bullet weights like 55 gr, 150 gr, powder charges in grains.
Archery: Arrow weights and inserts often listed in grains.
Jewelry: Small masses occasionally measured in grains alongside carats.
Lab/precision: Historical references and niche applications.

Examples

Grains (gr)	Grams (g)	Example Use
55 gr	≈ 3.56394 g	.223/5.56 bullet weight
100 gr	≈ 6.47989 g	Archery arrow component
125 gr	≈ 8.09986 g	Handgun bullet weight
150 gr	≈ 9.71984 g	Hunting bullet (e.g., .308)
300 gr	≈ 19.43967 g	Heavy projectile
700 gr	≈ 45.35924 g	Large arrow or specialty load