ProAV Math: AV Calculators

ProAV Math is a calculator suite for A/V integrators, sound engineers, riggers and installers, and it shows the work. Every result expands to the formula, the same formula with YOUR numbers substituted in, and a numbered step-by-step breakdown with every intermediate value. Check your math, learn the why, or copy the whole derivation into a design document.

No black-box answers. See exactly how the number was reached.

69 calculators in 11 groups. Every calculator is free.

ACOUSTICS

• Sabine RT60, and RT60 per octave band from real materials (α and NRC lookup)

• Panel Placement: where speaker coverage lands on a wall, and the first reflection point

• Speed of sound and HF air absorption from temperature and humidity; wavelength at your air temperature

AUDIO

• Delay time (temperature and humidity compensated), phase delay

• Ceiling speaker layout and spacing, series / parallel and N-load impedance

• 70V / 100V constant-voltage line loading with amp headroom

• Amp power and SPL: the SPL you will get, or the watts to hit a target

• End-fire and cardioid sub arrays

DB AND LEVELS

• dB calculator: volts, dBu, dBV, dBFS, dBm and dBW

• Gain structure: input level to SPL through the amp

• SPL at distance, dB per doubling (point vs line source), dB addition (power sum)

SPEAKER CABINETS

• Vented box and port tuning, port air velocity (chuffing check)

• Thiele-Small box alignment, L-pad attenuator values

ELECTRICAL

• Ohm's law wheel, voltage drop (copper, single or three phase)

• Conduit fill: THHN and AV cables in EMT, RMC or PVC against the NEC fill limit

• Wire ampacity (NEC 310.16), grounding and bonding size (NEC 250.122)

• Surge arrestor, ground lead surge rise, grounding method by item

• Heat load: watts, BTU/hr and tons of cooling

NETWORKING

• PoE budget and PoE voltage drop, bandwidth budget, Ethernet distance and hops

• Subnet calculator, subnet planner, VLAN / DHCP scope planner

• Dante / AES67 multicast planner, PTP sync budget, traffic and failover time

RACKS

• Rack Builder: gear list to rack size, amps and heat, with a front elevation drawing

RIGGING

• Sling angle and leg tension, bridle legs, WLL and design factor, truss pick reactions, centre of gravity

VIDEO

• Projector throw distance, throw ratio, lens selection

• Projector lamp life: change, reorder and filter dates, with add to calendar

• LED wall resolution, tile count, power, data ports, viewing distance

• Screen size and viewing distance

LIGHTING

• Beam circle at distance, DMX channel count and patch, front wash layout

WIRELESS AND RF

• Intermod and frequency plan, TV channel finder, antenna length, coax loss, link budget

WHY INTEGRATORS USE IT

• Show-the-work derivation on every calculator

• Formulas cited to their source (NEC tables, acoustics references)

• A note on why and when to use every calculator, search, imperial or metric units

• Works offline, no account, no sign-up

• Dark interface built for the field

PRO (ONE-TIME PURCHASE)

The calculators are free with a banner ad. A one-time Pro purchase adds:

• Projects: save calculations into named jobs with client, venue and folders

• PDF export: client-ready reports with the worked math, Letter or A4, your company name in the header; preview, share or save to the device

• Send a project to AV Project Pro as a project file

• No ads

No subscriptions. Saving a calculation to a project is free; opening Projects and exporting the PDF need Pro.

Field-estimate disclaimer: Results are engineering estimates to speed up planning. Always verify electrical and code-related calculations against the current NEC edition and your local authority having jurisdiction (AHJ) before installation. The rigging calculators are planning estimates only and are not a substitute for a qualified rigger, an engineered load plan or the manufacturer's rated WLL.

Privacy: ProAV Math works offline and needs no account. The free version shows ads served by Google AdMob, which may use an advertising identifier; Pro removes ads.