Free for lifters
Tools for people who train
Plan your next set. Estimate your max. Build a warm-up.
1RM Calculator
Enter any set, weight, reps, and how close to failure you went. See your max across seven proven formulas plus the right load for every rep count.
Barbell Plate Calculator
Type a target weight and get the exact plates per side, or tap the plates already on the bar to count the total. Works in kg and lb.
Weightlifting Percentage Chart
Turn your one-rep max into working weights from 100% down to 30%, with the reps and training zone for each percentage. One lift or the big four at once.
Warm-Up Calculator
Enter your working weight and get a ready-to-run warm-up: sets, reps, and loads from the empty bar to your first work set.
RPE Calculator
Pair your estimated max with a target RPE and rep count to get your working weight. Full RPE chart with reps in reserve translated to plain language.
Body Fat Calculator
Use the US Navy tape method with a measuring tape, or a quick height-and-weight estimate. See fat mass, lean mass, and where you land.
Lean Body Mass Calculator
Calculate lean body mass from your body fat percentage, or estimate it with the Boer, Hume, and James formulas. Includes FFMI with honest context.
Training Volume Calculator
Enter your weekly hard sets per muscle group and see which muscles sit below the growth floor, inside the productive range, or past what you can recover from.
DOTS Calculator
Score your powerlifting total with the DOTS formula, the modern standard for pound-for-pound comparisons across bodyweights and sexes.
Wilks Calculator
Score your powerlifting total with the original Wilks formula and the 2020 update. Useful for older meet results and historical comparisons.
Ideal Body Weight Calculator
Run the Devine, Robinson, Miller, and Hamwi formulas side by side, then see why anyone who lifts should treat the answer with suspicion.
Personal Trainer Cost Calculator
Estimate what a personal trainer costs per session, month, and year in your city, then see how much you would save with an AI trainer.
The app does the rest
These tools answer one question at a time. Forge answers the one that matters every session: what should I do today, at what weight, and how do I know it is working.
Your AI trainer builds the plan, adjusts it as you progress, logs every set, and answers questions around the clock. You lift. It handles the math you just did by hand.
Stop calculating. Start training.
Get a coach-built plan that adapts to you, for less than a month of a human trainer's single session.
- 7-day free trial
- $59.99/year
- Cancel anytime