Contact us
Found a calculation issue, want a new calculator, or just have a question about one of our tools? We read every message.
How to reach us
Email is the fastest way to get in touch. We typically reply within 1–2 business days.
hello@tongboiot.com
Please include the calculator name and, if it's an error, the inputs you used and the result you expected. That helps us reproduce the issue and fix it faster.
Before you email — check the FAQs
Many common questions are already answered in our guides and on each calculator page. A quick look may save you the wait:
- Rug size by bed — what fits a king, queen, or twin bed
- How to measure a room for flooring
- How much paint do I need?
- Square footage of a house
- All guides
When we'd especially like to hear from you
- You found an error. If a result looks wrong, tell us the inputs and the expected number — we'll verify against the formula and published specs.
- You want a new calculator. We add tools based on reader requests. Tell us the project and the math you'd like handled.
- You spotted a broken link. If a page or link isn't working, the URL helps us fix it quickly.
Who runs RugCalc
RugCalc is an independent home-improvement measurement project, operated under the tongboiot.com domain. We build free, no-signup calculators and measurement guides for homeowners and DIYers. Every formula is based on published manufacturer specs and common industry design rules, and each guide lists its assumptions so you can verify the math yourself.