FILE 04 REV 2026.04 7 TOOLS · LIVE
04 Section · Calculators RUN
THE MATH.
Tank size, recovery time, wire gauge, battery drain, decibel falloff, PSI → loudness, cordless pack life. Every calculator runs in your browser, cites its formula, and ships an embeddable iframe at /embed/.
/01 Blasts per tank
Air Tank Runtime
- Inputs
- Tank gal · max PSI · min PSI · horn CFM
- Output
- Blast count · total seconds
- Source
- Boyle's law · isothermal expansion
V_usable = V_tank × (P_max − P_min) / 14.7
Open tool →
/02 Tank fill time
Compressor Recovery
- Inputs
- Compressor CFM · tank vol · PSI range · duty cycle
- Output
- Fill time · duty-adjusted
- Source
- Volumetric efficiency · Viair test data
t = (V × ΔP × 7.48) / (CFM × 14.7)
Open tool →
/03 AWG by amps & length
Wire Gauge
- Inputs
- Voltage · amperage · run length · drop %
- Output
- AWG · fuse size
- Source
- ABYC E-11 · NEC 310.16
AWG = round(−10 · log₂(A × L × K / V_drop))
Open tool →
/04 Engine-off runtime
Battery Drain
- Inputs
- Battery Ah · amp draw · duty · alternator
- Output
- Runtime min · DoD safe
- Source
- Peukert's law · capacity vs load
t = (C / I)^n — Peukert
Open tool →
/05 Loudness anywhere
dB at Distance
- Inputs
- Source SPL · target distance · ref distance
- Output
- dB at target
- Source
- Inverse-square · free-field model
SPL₂ = SPL₁ − 20·log₁₀(r₂/r₁)
Open tool →
/06 dB by tank pressure
PSI → Loudness
- Inputs
- Horn model · operating PSI
- Output
- SPL curve · dB at any PSI
- Source
- DJD Labs bench tests
SPL = SPL_ref + K · log₁₀(P / P_ref)
Open tool →
/07 18V handheld horns
Cordless Pack Runtime
- Inputs
- Pack class · Ah · condition · pattern
- Output
- Runtime · blast count
- Source
- Measured 25 A @ 18 V load
I = 450 W / V_pack · t = Ah/I
Open tool →
· Methodology
HOW THESE TOOLS WORK.
01
Browser-side math
No backend, no tracking, no signup. Every calculator runs in your browser. Inputs persist in URL params for sharing.
02
Cited formulas
Boyle's law for tanks. Peukert for batteries. ABYC E-11 for wire. We name the source and show the formula on every tool.
03
Embeddable
Each tool ships at /tools/<slug>/embed/ as a standalone iframe target — drop into any forum, blog, or product page.