Rounds Per Minute Calculator — Cyclic Rate of Fire
Convert between rounds per minute, rounds per second, time between rounds, and rounds over any period. Enter a round count and duration, or key in an RPM directly.
Mode
s
Time unit
Cyclic rate — how many rounds are fired or completed in one minute
- 1
Rate per second
30 ÷ 60 = 0.5 - 2
RPM
0.5 × 60 = 30
How does this calculator work?
RPM = (rounds ÷ seconds) × 60. Invert to get time between rounds: ms per round = 60,000 ÷ RPM. Enter a count + time to compute the rate, or enter RPM directly to get rounds per second, interval in milliseconds, and extrapolated counts for 10 s, 30 s, 1 min, and 1 hour.
Formula
How this is calculated
Rounds per minute (RPM) is the standard measure of cyclic rate — how many rounds, shots, or repetitions occur in one minute. The formula is straightforward: divide the number of rounds by the elapsed time in seconds, then multiply by 60 to scale to a one-minute rate. Rearranged, RPM ÷ 60 gives rounds per second, and 60 000 ÷ RPM gives the interval between rounds in milliseconds.
In firearms, cyclic rate is a property of the mechanism. Common figures: a typical semi-auto rifle fires as fast as you pull the trigger (user-limited), a standard automatic fires 600–900 RPM (roughly one round every 67–100 ms), and a Minigun operates at 2,000–6,000 RPM (roughly 10–50 ms between rounds). In machining, "cycles per minute" for a CNC lathe or punch press uses identical arithmetic.
The calculator also extrapolates to longer periods — rounds in 30 seconds, in an hour — by linear scaling. This assumes a constant, steady-state rate throughout; in practice, magazine changes and heat limits interrupt sustained fire.
Frequently asked questions
Divide the number of rounds by the elapsed time in seconds, then multiply by 60. For example, 30 rounds in 60 seconds is 30 ÷ 60 × 60 = 30 RPM.
Divide 60,000 by the RPM to get the interval in milliseconds. At 600 RPM the interval is 60,000 ÷ 600 = 100 ms per round.
Most standard automatic rifles fire between 600 and 900 rounds per minute (67–100 ms per round) when cycling continuously. Higher-rate weapons such as Miniguns reach 3,000–6,000 RPM.
Also known as
TG we-Calculate Editorial Team. (2026). Rounds Per Minute Calculator — Cyclic Rate of Fire [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/rounds-per-minute-calculator
TG we-Calculate Editorial Team. "Rounds Per Minute Calculator — Cyclic Rate of Fire." TG we-Calculate. 2026. https://we-calculate.com/calculator/rounds-per-minute-calculator.
TG we-Calculate Editorial Team, "Rounds Per Minute Calculator — Cyclic Rate of Fire," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/rounds-per-minute-calculator
@misc{wecalculate_rounds_per_minute_calculator, title = {Rounds Per Minute Calculator — Cyclic Rate of Fire}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/rounds-per-minute-calculator}}, year = {2026}, note = {TG we-Calculate} }
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