About Tapeline

Tapeline is a set of 57 practical calculators for people planning and doing real work: homeowners, DIYers, contractors, tradespeople and anyone towing a trailer.

We build fewer, stronger tools rather than hundreds of near-duplicate pages. When two popular searches use the same math — a concrete patio and a concrete driveway, for example — they share one well-built calculator.

What we promise

Every calculator shows its formula, its assumptions and a worked example computed by the same engine you use. Every calculator has automated tests against known values. Where a result touches building, electrical, plumbing or vehicle safety rules, we say so plainly and tell you what to verify.

What we don’t do

We don’t invent vehicle specifications, reproduce copyrighted code tables, or present estimates as guarantees. See the methodology and disclaimer.