Archery Unit Converter
Arrow specs, bow ratings, and hunting regulations mix imperial and metric units. Convert grains, grams, feet per second, meters per second, foot-pounds, joules, GPI, and draw weight in one place, with every result shown at once.
🎯 Archery Unit Converter
Enter your values below. Results update as you type.
| Unit | Value |
|---|
1 gram = 15.4324 grains · 1 m/s = 3.28084 fps · 1 joule = 0.73756 ft-lb
1 g/m = 0.39198 GPI · 1 kg = 2.20462 lb · 1 kg·m/s = 0.22481 slug·ft/s
📊 Common Archery Conversions
Quick reference values archers look up most often.
| Imperial | Metric | Where you see it |
|---|---|---|
| 100 grains | 6.48 g | Field points and broadheads |
| 425 grains | 27.5 g | Typical whitetail hunting arrow |
| 9.0 GPI | 23.0 g/m | Mid-weight hunting shaft |
| 300 fps | 91.4 m/s | Fast compound arrow speed |
| 40 ft-lb | 54.2 J | Common deer energy guideline |
| 65 ft-lb | 88.1 J | Common elk energy guideline |
| 50 lb draw | 22.7 kg | Hunting draw weight minimums |
| 29 in draw | 73.7 cm | Average adult draw length |
📘 When You Need to Convert
- European arrow specs. Many shaft makers list weight in g/m rather than GPI. Convert before using our arrow weight calculator.
- Hunting regulations. Several countries set minimum arrow energy in joules and minimum arrow mass in grams instead of ft-lb and grains.
- Chronograph settings. Some chronographs read in m/s. Convert to fps to compare against IBO speed ratings.
- Component scales. Kitchen and jewelry scales often read grams. Multiply by 15.43 to get grains.
❓ Frequently Asked Questions
How many grains are in a gram?
One gram equals 15.4324 grains. A 100-grain broadhead weighs about 6.48 grams, and a 425-grain arrow weighs about 27.5 grams.
How do I convert fps to m/s?
Divide feet per second by 3.28084. An arrow at 280 fps is traveling about 85.3 m/s.
How do I convert ft-lbs to joules?
Multiply foot-pounds by 1.35582. A 60 ft-lb arrow carries about 81.3 joules of kinetic energy.
How do I convert GPI to grams per meter?
Multiply grains per inch by 2.5512. A 9.0 GPI shaft weighs about 23.0 g/m.
Is a grain the same as a gram?
No. A grain is much smaller: one gram is more than 15 grains. Mixing them up is one of the most common arrow-build mistakes.
🧮 Related Calculators
Calculator results are planning estimates. Always confirm your setup with chronograph readings and real shooting.