Free tools
IT tools
Small calculators we use ourselves. Everything runs in your browser — nothing you type here is sent anywhere, including to us.
Subnet calculator
What a CIDR block actually gives you: the range, the broadcast address and how many devices fit.
Backup window
How long a backup takes over a given link — the number that decides whether an overnight backup actually finishes overnight.
How long would that password last?
A rough time-to-crack for an offline attack. It is an order of magnitude, not a promise — but the difference between “minutes” and “centuries” is the point.
Monthly filing calendar
The recurring Tanzanian deadlines, by day of the month.
| Day | What | Who |
|---|---|---|
| 7 |
PAYE and SDL Employment taxes for the previous month.
|
TRA |
| 15 |
NSSF contributions Employee and employer pension contributions for the previous month.
|
NSSF |
| 20 |
VAT return For VAT-registered businesses only. Due even in a month with no sales.
|
TRA |
| 30 |
WCF contributions Monthly, against the payroll.
|
Workers Compensation Fund |
Deadlines only — no rates or thresholds, because those change and a stale number here would cost somebody money. Confirm the amounts with TRA or your accountant. Annual filings (BRELA returns, licence renewals) sit outside this monthly cycle.
Why there is no “send me the results” button
A subnet plan and a backup window are facts about your network. We would advise a client against typing those into somebody else's website, so this page has nowhere to send them — no form action, no analytics on the inputs, nothing. Everything above is computed by your own browser.