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Use of the Calculators
You may use the calculators freely for personal and commercial estimating. Results are estimates; read the calculator disclaimer before relying on them.
Free Accounts
Some calculators, and print-outs without the watermark, need a free account. Accounts are personal: do not share your sign-in or try to get around the account check. We may suspend accounts that are misused, and you can ask us to delete your account at any time.
Content
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Embedding the Calculators
You may embed any calculator that offers an Embed This Calculator box on your own website, free, using the code in that box. Keep the credit link below the calculator, and do not change the calculator, frame it as your own, or place it on pages that are unlawful or misleading. We may stop an embed from working at any time.
No Warranty
The site is provided "as is", without warranties of any kind. The owner may change or remove calculators at any time.