Fitness Calculators
One Rep Max Calculator
Estimate true max strength from a submax set and get a safer training max for programming.
Page structure
Built for a fast answer first, then a calmer second read.
This calculator page is intentionally layered: quick input and output up top, then a deeper pass through formulas, worked examples, FAQs, and related tools.
Result
Estimated 1RM
85.9 kg estimated 1RM
Estimated 1RM lets you plan heavy training without testing a true max every week.Results explained
- Estimates are more reliable in the 1–10 rep range.
- Use a training max for programming and save true max attempts for specific testing blocks.
- Sleep, exercise selection, and fatigue can meaningfully shift your true max.
Best used for
Clearer context before the number
Strong fit for strength traffic and internal links to protein and calories pages.
Coverage
Tags and page signals
strengthfitnesspowerlifting
Formula & steps
Strength formulas
- This page shows both Epley and Brzycki estimates.
- It also calculates a 90% training max.
- The estimate is usually strongest in the 1–10 rep range.
Examples
Quick scenario checks
- 100 kg × 5
Estimated 1RM around 112–113 kg.
- Use 90% of estimate
Helps keep percentage-based programming honest.
FAQ
Questions worth ranking for
Each calculator page keeps its own compact FAQ block to widen long-tail coverage.
Which 1RM formula is best?
No single formula wins every time, so a range is useful.
Do I need to test a true max?
Not for everyday programming.
What is a training max?
A slightly reduced number used to keep percentages sustainable.