The calculator lets you take the details from your last BT quarterly bill summary and enter these into the bill calculator. Based on the three best tariffs found in the league table, the calculator will show you what the quarterly bill would be for the same phone traffic and the total annual savings, including VAT, when compared with BT standard tariff. If your bill is for one month only, please remember to multiply this number by three.

If you have multiple bills, just run the calculator for each bill and add the totals up to get savings.

We advise schools using BT Internet Caller for Schools, which dials 0820 telephone numbers, they must leave these lines out, since this is a bundled service from BT and will be rejected for carrier pre-select by BT.