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Get in touch
Questions about a calculation, a correction to a formula, or help with your account. We read everything and reply by email.
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Found a formula wrong?
Tell us which calculator and the figures you used. Accuracy is the whole product, so a correction is the most useful message you can send.
What we cannot do
We cannot advise on whether a rate or charge is lawful, or interpret your contract. Those need a qualified professional who has read it.