Last updated
Estimated one-rep max from submaximal sets using three common formulas and their average, plus training loads at 60–95% of estimated 1RM.
Quick answer: 1 Rep Max Calculator
Epley, Brzycki, and Lombardi 1RM estimates averaged with %1RM working-weight table.
Example: 225 lb × 5 reps might land near a mid-250s averaged 1RM before individual variation.
Calculations follow the documented formula on this page; rounding and input units can change the last digit-treat outputs as educational estimates unless you reconcile with source systems.
* This is an estimate. Actual amounts may vary slightly based on input assumptions.
Submax sets (1–10 reps) feed formulas; true max attempts need safety and spotters.
Estimated one-rep max from submaximal sets using three common formulas and their average, plus training loads at 60–95% of estimated 1RM.
Inputs on this page: Weight lifted, Reps completed (1–10), Exercise (label only). Assumptions stay visible so you can reproduce the figure elsewhere.
Long-form walkthroughs that pair well with this calculator. When you need narrative context beyond the live fields, start here and return to the tool to plug in your own numbers.
Marketplace seller fees: Stripe, PayPal, Etsy, and eBay (2026)
Model percent plus fixed Stripe and PayPal fees, Etsy listing and stacked percents, and eBay final value sketches with honest limits. Link to ROI vs ROAS and margin guides on Toollabz.
Read guide →Loan calculator: how banks calculate your EMI (2026)
EMI explained with amortization intuition, what banks add beyond the formula, and how to pair Toollabz loan & EMI calculators for honest comparisons.
Read guide →Margin vs Percentage: What's the Difference? (2026)
Margin and percentage are often confused. Learn the exact difference with real examples, formulas, and when to use each. Free calculator included.
Read guide →ROAS, churn, LTV, and CAC for growing SaaS teams (2026)
Connect ROAS calculator thinking with churn shortcuts, LTV SaaS, and CAC SaaS on Toollabz. Cross-link ROI vs ROAS and contribution margin posts so paid growth does not fight retention reality.
Read guide →People who care about one rep max calculator use 1 Rep Max Calculator as a planning sandbox: Peaking cycles and technique changes invalidate old rep-max data.
Continue in the Calculators category hub, the Utility tools collection, or the glossary. Related calculators in this session: Daily Calorie Calculator, VO2 Max Calculator, Race Pace Calculator, Cycling Power-to-Weight Calculator, Percentage Calculator, BMI Calculator.
The Formula
Epley, Brzycki, Lombardi 1RM estimates from submax set; training % table from chosen 1RM| This tool | Epley, Brzycki, Lombardi 1RM estimates from submax set; training % table from chosen 1RM |
|---|---|
| Related intent: one rep max calculator | See paired tools for one rep max calculator-each page documents its own core relationship next to the live form. |
| Related intent: 1RM estimator | See paired tools for 1RM estimator-each page documents its own core relationship next to the live form. |
Core relationship for 1 Rep Max Calculator:
Epley, Brzycki, Lombardi 1RM estimates from submax set; training % table from chosen 1RM
Worked check: 225 lb × 5 reps might land near a mid-250s averaged 1RM before individual variation.
Keep the same assumptions and open a neighbor calculator when your question branches: Daily Calorie Calculator, VO2 Max Calculator, Race Pace Calculator, Cycling Power-to-Weight Calculator. Each page documents its own formula beside the fields.
Learning links: Methodology · Editorial policy · Glossary
225 lb × 5 reps might land near a mid-250s averaged 1RM before individual variation.
Re-enter the same numbers in the calculator above to confirm the page math matches the interactive result.
People who care about one rep max calculator use 1 Rep Max Calculator as a planning sandbox: Peaking cycles and technique changes invalidate old rep-max data.
Instant response
Run 1 Rep Max Calculator in the browser and read the breakdown beside the form.
Transparent formula
The formula and worked example on this page match what the calculator uses.
Privacy friendly
No account required; inputs stay in your session unless you choose to share them.
Cross-device ready
Layout works on mobile, tablet, and desktop for the same field labels.
Official references for context. Calculator outputs are planning estimates—confirm material decisions with the primary authority or a qualified professional. See our methodology and editorial policy.
Reviewed July 18, 2026 · Content stamp 2026-07-18
Click a question to expand the answer.
Yes, the 1 Rep Max Calculator is completely free with no hidden limits.
Yes. All tools are optimized for desktop, tablet, and mobile devices.
True 1RM tests carry injury risk - submax estimation is often safer.
Epley, Brzycki, and Lombardi 1RM estimates averaged with %1RM working-weight table.
225 lb × 5 reps might land near a mid-250s averaged 1RM before individual variation.
Peaking cycles and technique changes invalidate old rep-max data. Use safeties or power racks - don’t zero-out pins on max singles. Women’s neuromuscular efficiency differs - coaches adjust spread.
No. Use it as a transparent planning check, then verify critical outcomes in your own systems or with a qualified professional when stakes are high.
Compare units, rounding, compounding, and tax basis side by side. This page documents: Epley, Brzycki, Lombardi 1RM estimates from submax set; training % table from chosen 1RM
Same-category picks first, then high-intent neighbors that often answer the next calculation question.
Percentage Calculator
Calculate percentages, percentage of an amount, and percentage change.
BMI Calculator
Calculate adult body mass index from height and weight.
Tip Calculator
Calculate tip, total bill, and per-person split.
Recipe Scaling Calculator
Scale ingredient amounts from original to desired servings.
Baking Ingredient Substitution Tool
Swap common baking ingredients with measured alternatives.
Cooking Time & Temperature Calculator
Roast time, oven temperature, and safe internal temp by meat type.
Open the full directory, browse your hub collection, or jump back to this category. Bookmark the page if you use it often.
Reviewed by Toollabz Editorial
Product editor | Last reviewed July 18, 2026
See methodology and editorial policy.