About
Who we are and why we built these tools.
LeeChuanjing Shop sells small, honest digital tools: Excel workbooks, PDF guides and design assets that solve one specific planning problem and then get out of the way.
Why we started
The free calculators on this network were built to answer questions people kept asking the same way: how much paint, how many tiles, what is my real hourly rate. Thousands of people used them, and the most common follow-up question was always the same — "can I just get the whole thing in a spreadsheet so I can change the numbers and see what happens?"
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.
How we build
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.
Fair pricing
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 free tools
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.
Contact
Questions, bug reports or bulk enquiries: use the contact form. We read everything and reply to real problems quickly.