Contact Us
Every message is read — corrections answered within 48 hours
Last updated: August 2025
How to Reach Us
Both channels reach the editorial team directly. Please note your intent when adding (correction / suggestion / partnership):
- QQ: 9277493 (corrections & tool suggestions — preferred)
- WeChat: 13993092173 (business & partnership inquiries)
Response Promise
| Feedback Type | Response Time | How We Handle It |
|---|---|---|
| Calculation errors / corrections | Confirmed within 48 hours | Reproduce → fix → update review date → reply |
| New tool suggestions | Within 3 business days | Demand assessed; high-demand tools prioritized |
| Business / technical partnerships | Within 3 business days | Routed to the right contact once scope is clear |
| Other inquiries | Within 7 business days | Forwarded to the relevant owner |
Corrections (Highest Priority)
If you spot a wrong result, a formula-convention deviation, or outdated content, reach us via either channel above. To help us locate the issue fast, please include:
- Page URL — just copy it from your address bar
- Your inputs — e.g. "height 175, weight 70"
- Expected vs actual result — e.g. "should be 22.9, shows 0"
- (Optional) Your reference — an official document, textbook or authoritative link
Suggest a New Tool
We keep expanding the library (459 tools and counting). If a calculator you need is missing, tell us your scenario and the expected inputs/outputs — e.g. "enter floor area and renovation style, get a budget estimate". High-demand tools get prioritized.
Business & Technical Partnerships
Our open REST API can be integrated into your product for free: GET /api/v1/calc/[slug], full spec at /api/v1/openapi.json. For content licensing, data partnerships or link exchange, contact us via WeChat (13993092173) with your organization, intent and proposed form of cooperation.
Self-Help
These entries may solve your problem faster:
- Tool broken or displaying oddly? A hard refresh (Ctrl/Cmd + Shift + R) usually fixes cache issues
- Formulas & derivations: see the "Principles & Formulas" block on each tool page
- Data sources: see the "Source & Updates" block at the bottom of each tool page
- Our quality pipeline: see the Editorial & Review Policy page