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About
Who we are and why we built these tools.
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That request is what this shop is. Every product started as a calculator, then grew into a workbook with the reference tables, the worked examples and the scenarios that a single online form cannot hold.
Everything is built with native Excel formulas, native charts and native conditional formatting. No macros, no VBA, no Power Query, no plug-ins. A file that needs something enabled is a file that breaks on someone else's machine, and we would rather not ship that.
Coverage rates, thresholds and conversion factors are drawn from published trade references and manufacturer data sheets. Where a figure is a rule of thumb rather than a specification, the sheet says so, and you should always check the data sheet for the specific product you are buying.
Entry products sit at $12–15 because a spreadsheet is a low-cost product and we would rather sell a lot of them than pretend they are more than they are. The bundle price is a genuine discount on the three parts bought separately, not a made-up "compare at" number.
The calculators at leechuanjing.com, pay.leechuanjing.com and blog.leechuanjing.com remain free, with no account and no sign-up. If they answer your question, you do not need to buy anything. That is the point.
Questions, bug reports or bulk enquiries: use the contact form. We read everything and reply to real problems quickly.
">That request is what this shop is. Every product started as a calculator, then grew into a workbook with the reference tables, the worked examples and the scenarios that a single online form cannot hold.
Everything is built with native Excel formulas, native charts and native conditional formatting. No macros, no VBA, no Power Query, no plug-ins. A file that needs something enabled is a file that breaks on someone else's machine, and we would rather not ship that.
Coverage rates, thresholds and conversion factors are drawn from published trade references and manufacturer data sheets. Where a figure is a rule of thumb rather than a specification, the sheet says so, and you should always check the data sheet for the specific product you are buying.
Entry products sit at $12–15 because a spreadsheet is a low-cost product and we would rather sell a lot of them than pretend they are more than they are. The bundle price is a genuine discount on the three parts bought separately, not a made-up "compare at" number.
The calculators at leechuanjing.com, pay.leechuanjing.com and blog.leechuanjing.com remain free, with no account and no sign-up. If they answer your question, you do not need to buy anything. That is the point.
Questions, bug reports or bulk enquiries: use the contact form. We read everything and reply to real problems quickly.
">Who we are and why we built these tools.