Coming Soon Free
One Rep Max (1RM)
Calculate maximum weight for a single repetition.
Calculator Coming Soon
We're building the One Rep Max (1RM). When it launches, you'll get instant results, formula explanations, and shareable result cards — all free.
✦ Instant calculation
✦ Formula breakdown
✦ Copy & share results
✦ No account needed
About One Rep Max (1RM)
Calculate maximum weight for a single repetition. This calculator provides instant, accurate results right in your browser — no downloads, no accounts, no ads.
Frequently Asked Questions
Is this calculator free?
Yes — all toolooo calculators are 100% free, forever. No signup, no ads, no paywalls.
When will this calculator be available?
We're actively building calculators for all categories. Follow @khizooo for launch announcements.
Are calculations private?
All calculations happen in your browser. Nothing is sent to any server.