# Calculators

> The six free 00 Simulator calculators: what each one answers, what they share with the simulator, and when to open the simulator instead.

Source: https://simulator.00aud.io/docs/guides/calculators

Six free calculators each answer one box question in the browser, with no account: a port length, a box volume, sealed or ported. They run the simulator’s own model, so their numbers match the app’s closely. Open the simulator when the design needs more than one answer.

## The six calculators

| Calculator | What it answers | Needs a driver | Into the simulator |
| --- | --- | --- | --- |
| [Bass-reflex port calculator](https://simulator.00aud.io/calculators/bass-reflex-port) | How long to cut a port for a box and a tuning (**Port length**), or the tuning a port you have gives (**Tuning**). **Round** or **Slot**, one port or several, drawn to scale. | No | **Simulate it with a driver** |
| [Port velocity calculator](https://simulator.00aud.io/calculators/port-velocity) | How fast the air moves in a port across the bass range, with a real driver, power and an optional high-pass, and the cone excursion alongside. | Yes | **Open in the simulator** |
| [Speaker box volume and dimensions calculator](https://simulator.00aud.io/calculators/speaker-box-volume) | Net volume from a box’s **Outside** or **Inside** sizes (**Volume**), the depth for the volume you need (**Depth**), or a whole box in good proportions (**Box size**), allowing for the panels and what sits inside, with a cut list. | No | **Tune a port for this box** takes the volume to the port calculator |
| [Sealed box calculator](https://simulator.00aud.io/calculators/sealed-box) | The box volume for the Qtc you want (**Box volume**), or the Qtc of a box you have (**Qtc**), with the response, F3 and cone excursion. | Yes | **Open in the simulator** |
| [Ported box calculator](https://simulator.00aud.io/calculators/ported-box) | A box volume and tuning that suit the driver, with the port to build, the response against the same driver sealed, cone excursion and port air speed. | Yes | **Open in the simulator** |
| [Subwoofer box calculator](https://simulator.00aud.io/calculators/subwoofer-box) | Sealed or ported? Starting boxes for the driver side by side, by size, extension, level at your power and the most each can play, with a pick for **Compact**, **Balanced** or **Deep**. | Yes | **Open the pick in the simulator**, or **Simulator** on any box |

All six are listed together at [Calculators](https://simulator.00aud.io/calculators). Each links to the others that pick up where it stops: the box volume calculator’s **Sealed or ported?** leads to the subwoofer box calculator, for example.

## What they share

- _A driver._ The calculators that need one start on an illustrative 12-inch woofer marked **Example**. Search the driver library by brand or model, **Paste T/S values** from a spec sheet, or **Edit T/S** to type them in.
- _Units._ The switch at the top reads **mm · L** or **in · ft³**.
- _A link._ **Copy link** copies an address that reopens the calculator with your numbers. **Reset to the example** starts again.
- _The model._ The calculators with a driver run the simulator’s model in half space at 1 m, with one simplification: they leave out the driver’s voice coil inductance, which only rolls off the top of the range. The simulator includes it.

## The same model as the simulator

The [vented example](https://simulator.00aud.io/app?template=vented) is a 55 L box tuned to 32 Hz with one 100 mm port. The port calculator cuts that port to **355.6 mm**, and the simulator’s **Port length** reads the same.

_Figure: The Bass-reflex port calculator’s side section of a 100 mm port cut to 355.6 mm for a 55 L box tuned to 32 Hz, beside the simulator’s Enclosure panel for the same box, showing a Port length of 355.6 mm._

The same 55 L, 32 Hz box in the port calculator and in the simulator, with the same end corrections. Worked out when this page was built.

| | Port length |
| --- | --- |
| Bass-reflex port calculator | 355.6 mm |
| 00 Simulator, Enclosure panel | 355.6 mm |

The port calculator shows more about the port itself: the effective length the air behaves as, other port sizes for the same tuning, a guide to trimming a port to tune it, and a check that it fits a box of a given depth. [Ports and end correction](https://simulator.00aud.io/docs/boxes/ports) explains the effective length.

## Take a design into the simulator

1. **Press the button.** At the foot of a calculator, **Open in the simulator** (or **Simulate it with a driver** on the port calculator) opens the simulator with the design in the address.
2. **Check it.** A dialog shows what will be added: **Inspect this vented design** or **Inspect this sealed design**, with the driver, box and power. The port calculator has no driver, so **Check this port with your driver** asks for one first.
3. **Add it.** **Create vented design** or **Create sealed design** adds it as a new enclosure beside the ones already there, and saves its driver to your own drivers if it is not there yet.

## When to open the simulator instead

The calculators cover sealed and vented boxes with one driver, in half space at 1 m. Open the simulator when you need:

- _Other box types._ Passive radiators, fourth- and sixth-order bandpass boxes and eight kinds of horn: [Choose an enclosure type](https://simulator.00aud.io/docs/start/enclosure-types).
- _Several boxes on one graph._ Every enclosure in a workspace draws its own curve: [Compare designs](https://simulator.00aud.io/docs/guides/compare).
- _More graphs._ Impedance, group delay, phase and the most each design can play before it reaches a limit: [All tiles](https://simulator.00aud.io/docs/reference/tiles).
- _The rest of the system._ Several drivers and their wiring, series resistance, full EQ, the radiation space and listening distance: [Power and limits](https://simulator.00aud.io/docs/guides/power-and-limits) and [EQ and filters](https://simulator.00aud.io/docs/guides/eq-and-filters).
- _To keep and share it._ Signed in, workspaces save as you go, and any design can be shared as a link: [Share and publish](https://simulator.00aud.io/docs/guides/sharing).
- _To check a build._ Import a measurement and compare it with the simulation: [Measured traces and notes](https://simulator.00aud.io/docs/guides/measurements).

## Ask your AI

**Ask your AI**

Your assistant can size, add and simulate boxes through the 00 Simulator connector, with the same model the calculators use.

> Using 00 Simulator, suggest a sealed and a vented box for the Ciare 12.00SW, add both to my open workspace, and compare their F3, peak cone excursion and peak port air speed at 200 W.