Enter the weight you lifted and the number of reps performed into the 5/3/1 calculator. The calculator will estimate your 1RM, calculate a Training Max (TM), and display commonly used 5/3/1 set weights (as percentages of TM).

5/3/1 Lifting Program Calculator

Enter the weight lifted and the number of reps to estimate your 1RM, compute a Training Max (TM = 90% of 1RM), and generate standard 5/3/1 weekly set weights. For safety and accuracy, this calculator only estimates 1RM from 1–10 reps.

Tip: Real-world loading is limited by plates/dumbbell jumps—round to a load you can set up safely.

Safety note: Educational use only; not medical advice. Strength training carries injury risk—use conservative loads, prioritize technique, and consider working with a qualified coach. If you have cardiovascular disease, uncontrolled high blood pressure, are pregnant/postpartum, have an injury, are under 18, or have medical concerns, consult a clinician before attempting heavy lifts. For “+” sets, avoid grinding to failure; stop with pain, dizziness, or chest symptoms.

Using the 5/3/1 Calculator

This calculator takes a recent set of 1–10 reps, estimates your one-rep max, reduces it to a Training Max (TM), and then applies the standard 5/3/1 percentages. The key idea is simple: train from a conservative TM, not from an all-out max.

\text{Estimated 1RM} = \frac{\text{Weight Lifted}}{1.0278 - 0.0278 \times \text{Reps}}
\text{Training Max (TM)} = 0.90 \times \text{Estimated 1RM}
\text{Week 1 Sets} = (0.65,\ 0.75,\ 0.85)\times \text{TM}
\text{Week 2 Sets} = (0.70,\ 0.80,\ 0.90)\times \text{TM}
\text{Week 3 Sets} = (0.75,\ 0.85,\ 0.95)\times \text{TM}

Quick Setup Guide

Step What to do Why it matters
1 Enter a recent set using the same unit throughout. Mixing lb and kg will distort the estimate.
2 Use a technically clean set for 1–10 reps. Higher-rep sets make any 1RM estimate less reliable.
3 Use the calculated TM for programming. 5/3/1 is built around submaximal training.
4 Round each work set to a load you can actually set up. Barbells, plates, and dumbbells move in fixed increments.

Standard Weekly Percentages

Week Set 1 Set 2 Set 3 Target
Week 1 (5s) 65% × 5 75% × 5 85% × 5+ Build volume with controlled effort
Week 2 (3s) 70% × 3 80% × 3 90% × 3+ Shift toward heavier strength work
Week 3 (5/3/1) 75% × 5 85% × 3 95% × 1+ Top strength exposure without maxing out
Week 4 (common deload option) 40% × 5 50% × 5 60% × 5 Reduce fatigue and recover

Note: The calculator covers the main work sets. Warm-ups, assistance work, and template-specific variations are separate decisions.

Example

If you lift 185 lb for 8 reps, the estimate is:

Item Value
Estimated 1RM 229.7 lb
Training Max (90%) 206.7 lb
Week 1, rounded to nearest 5 lb 135 / 155 / 175 lb
Week 2, rounded to nearest 5 lb 145 / 165 / 185 lb
Week 3, rounded to nearest 5 lb 155 / 175 / 195 lb

How to Progress Each Cycle

Lift category Common TM increase next cycle Practical takeaway
Upper-body lifts +5 lb Small jumps keep technique stable and progress sustainable.
Lower-body lifts +10 lb Lower-body lifts usually tolerate slightly larger increases.

When Your Numbers Feel Off

  • Too heavy early: lower your TM and rebuild from a more conservative base.
  • Last set turns into a grind: stop before form breaks down; the goal is quality reps, not failure.
  • Estimate seems inflated: use a cleaner, lower-rep set for your input.
  • Rounding changes the feel: keep rounding consistent from week to week.

Common Mistakes

  • Using a true max instead of a training max.
  • Entering sloppy reps just to get a higher estimate.
  • Changing units mid-calculation.
  • Treating every + set like a mandatory all-out AMRAP.
  • Ignoring recovery, sleep, and assistance volume.

FAQ

Should I calculate from my true 1RM or from a rep set?
A clean rep set is often the better starting point because it gives a practical estimate without requiring a max test.

What does the + mean on the final set?
It means the final set is typically performed for at least the prescribed reps, with additional reps only if technique stays solid.

Should I round before or after percentages are applied?
Calculate from TM first, then round each final work set to the nearest usable load.

What rep range gives the best estimate?
The calculator is intended for sets from 1 to 10 reps, with moderate rep ranges usually giving the most practical results.

Does this calculator replace a full program?
No. It gives the main work-set loads; exercise selection, warm-ups, assistance work, and recovery still need to be planned.