Train heavy. Train often. Train smart.
Strength is built by managing two things — how hard each set feels (RPE) and how heavy the weight is relative to your max (%1RM). This tool teaches both, calculates them for your lifts, and helps you decide how hard to push today.
This is important if any of these describe you today:
- Pregnant, postpartum, or returning to lifting after pregnancy
- Returning from an injury or recent surgery (orthopedic, abdominal, cardiac)
- New to lifting, or returning after more than 6 months off
- Managing hypertension, cardiovascular issues, or other medical conditions affected by heavy lifting
- Currently in pain — start with our pain science tool instead
Your coach sent you here? Use this tool — but stick to RPE-based prescriptions (the converter and the self-check). Skip chasing specific percentages until your coach gives you a current tested max.
No coach yet? Connect with one before using this tool. The percentages aren't safe defaults for these situations.
- Get your number. Use the calculator below to estimate your one-rep max from a recent set. Skip if you already know yours.
- Plan today's set. The converter turns "reps × how hard" into the actual weight to load.
- Check yourself. A short self-assessment tells you how hard to push today.
- Watch the lift. The in-session rules cover what to do if something changes during training.
The RPE scale — click to explore
Each rating from 1 to 10 describes how a set felt and how many reps you had left in reserve. The lower end is warm-up and recovery territory; the upper end is true working effort. Tap any level to see what it looks like, when to use it, and where lifters most commonly get it wrong.
Estimate your 1RM & build your working weights
Enter a set you know you can do cleanly — weight × reps — and we'll estimate your one-rep max, then show you what your working percentages look like for that lift.
| %1RM | Working weight | Typical use |
|---|
Estimates get less accurate above ~10 reps. Use a recent, fresh, clean set — not a grinder. Round the working weights to what your gym actually loads — a barbell with 2.5 lb plates, the next dumbbell up (usually 5 lb jumps), the closest kettlebell (35 / 44 / 53 / 70 lb is common), or the nearest pin setting on a machine. When the math says 60 lb but you have 53 or 70 in your hand, pick whichever sits closer to today's effort target. These percentages map cleanest to your main compound lifts (squat, bench, deadlift, overhead press); accessory work tends to run looser — RPE is usually a better guide there than the chart.
If you entered a recent working set above, that estimated max is now your starting number. You don't need to test a true 1RM to use the rest of this tool — most people shouldn't test one cold anyway.
Three things to know:
- What you entered matters. A clean 5-rep set at RPE 8 (no grinding, no form breakdown) gets you within ~5% of your real max. A grinder or a guess gets you further off.
- Haven't done a working set yet? Pick a weight you can do for about 5 reps with one solid rep left in the tank. Plug those numbers in above. That estimate is good enough to start with.
- Don't want a number at all? Use the converter below with the 1RM field blank. You'll see the percentage without a specific weight — and you can train in RPE-only mode, which is the simpler path for most people.
If you're new to lifting, work with a coach to establish your starting numbers before chasing percentages.
Find your working weight
Two questions: how many reps you want to do, and how hard you want it to feel. The tool turns those into a starting-point weight to load.
An honest note. This only gives you a specific weight if the tool knows your one-rep max. If you haven't tested one, the calculator above estimates it from a recent set — and then the converter stacks another estimate on top to give you your working weight. The number you see is a best guess, not a precise prescription. If 60 lb feels heavy in your warm-up today, drop it. If it feels light, hold there and finish your sets. Your body tells you what's right faster than the math will.
Example: you want a hard-but-clean set of 5 reps (RPE 8) on squat. Pick 5 and 8 below. To get a real weight, enter your tested max — or use the calculator above to estimate one first.
Values from Reactive Training Systems' RPE chart (Tuchscherer). It's a guide, not a rule. Personal numbers can drift 3–5% depending on the lift, the day, and how recently you've tested — the underlying chart was developed primarily on male powerlifters, so women and newer lifters often find their working percentages slightly different. Calibrate over a few weeks.
When to use which
Neither system is "better." They answer different questions on different days. Most thoughtful programs use both.
Your body is the variable
- Sleep, stress, or fatigue are unusual
- You don't have a current, tested 1RM
- You're returning from a break or injury
- The goal is "hard but clean" — not a specific number
- You want to learn what real effort feels like
The plan is the variable
- You're running a structured strength block
- Peaking for a competition or test day
- You have a recent, reliable 1RM
- You want progressive overload you can graph
- Volume and intensity need to be precise
In practice: a percentage tells you what to load on the bar; an RPE tells you whether that load was right for today. When the two disagree — say, 80% feels like RPE 10 — the RPE wins, because your body just told you something the plan couldn't predict.
How hard should I push today?
Two short checks. First any pain you're carrying into the lift, then how your body is showing up today. Pain comes first — nothing else matters if it's loud enough.
Three clinical questions — the same framework as our pain science tool. If pain is the loudest signal today, it sets the floor for everything else.
A clinical heuristic — not a validated screening tool. The right intensity for today is also a body-and-bar-speed conversation that lives in the warm-up.
The point isn't to skip hard days — it's to know which day this is. A push-it day with the wrong body underneath it becomes the injury you didn't need. A back-off day spent grinding becomes a wasted session.
While you're training
The pre-workout decision is the easy part. What matters more is what you do during the session if things change. Two rules cover most of it.
After each working set, take 10 seconds to check in with the symptomatic area (or with how the lift felt overall). One of three things is happening:
The error most lifters make is "I'll just finish the set and reassess." Reassess between sets — not after the next one becomes the problem.
- Sharp pain — different in character from familiar muscular discomfort
- Neural symptoms — pins and needles, numbness, shooting pain, electric sensations
- Sudden strength loss — the limb stops working in a way that's not normal fatigue
- You can't breathe through it — chest tightness, dizziness, ringing ears, vision changes
- You hear or feel a pop — anywhere, ever, no exceptions
- Loss of form you can't fix — back rounding, knee caving, etc. that doesn't come back with a cue
Racking the bar early is never the wrong call. Finishing a set you should have stopped is how cheap injuries become long ones.
Train the lifter you brought today — not the one you wish you'd brought.
Carrying symptoms today? Start with our Pain Science 101 tool to understand what your body is telling you before deciding how to load it.
This tool is provided by NOVA Functional Training for educational purposes only. It does not constitute medical advice, a personal training prescription, or a substitute for professional coaching. All estimated one-rep maxes, RPE-to-percentage conversions, and readiness recommendations are general guidelines — they are not personalised to your medical history, injury status, or individual physiology.
By using this tool, you confirm that you are doing so voluntarily and accept full responsibility for any training decisions you make based on its output. NOVA Functional Training, Dr. Jane Pavalkis, and any affiliated coaches or staff are not liable for any injury, loss, or harm arising directly or indirectly from use of this tool or reliance on its recommendations.
If you are pregnant or postpartum, returning from injury or surgery, new to resistance training, or managing a medical condition, you must consult a qualified healthcare provider or coach before applying any information from this tool. When in doubt, stop and seek guidance.