SIM Data Usage Calculator

Work out sim data usage instantly with clear inputs, formula shown and shareable results.

About SIM Data Usage Calculator

Pooled data plans aggregate every SIM's allowance, so a few heavy devices are absorbed by many light ones. Total usage is SIM count times daily consumption across the 30.44-day average month, and anything above the pool is billed at the overage rate — which is typically several times the in-plan cost per gigabyte.

Formula

Pooled usage

monthly GB = SIMs x MB per day x 30.44 / 1000; overage = max(0, usage - pool); charge = overage x rate

Worked example

With the default values below, SIM Data Usage Calculator returns Monthly fleet data usage of 380.5. Change any input above and every figure here is recalculated in your browser.

Inputs used

SIM cards in the fleetminimum 1: 500
Data per SIM per dayminimum 0.001 MB: 25 MB
Pooled monthly allowanceminimum 0.001 GB: 400 GB
Overage charge per GBminimum 0: 6

Results

Monthly fleet data usage: 380.5 GB
Data above the pooled allowance: 0.00 GB
Overage charge: $0.00
Pool utilisation: 95.1%

Step by step

1Values used
2Pooled usage
3Monthly fleet data usage= 380.5 GB
4Data above the pooled allowance= 0.00 GB
5Overage charge= 0.00
6Pool utilisation= 95.1

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is pooling better than per-SIM allowances?

Because usage varies. Per-SIM caps mean some devices are throttled while unused allowance is wasted elsewhere; pooling smooths that out.

How is unexpected usage controlled?

Per-SIM caps within the pool, alerting on daily usage anomalies, and blocking non-essential destinations. A single misbehaving device can consume the whole pool.