# Free Workout Tools & Calculators | Forge

> **Quick Answer:** Forge hosts 12 free lifting calculators at forgetrainer.ai/tools. They cover one-rep max, barbell plate loading, percentage charts, warm-up ramps, RPE, training volume, body fat, lean body mass, DOTS, Wilks, ideal body weight, and personal trainer cost. Every tool is free and ungated, works in lb and kg, and runs fine on a phone between sets. No sign-up.

**dateModified:** 2026-08-09

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## Key Facts

- **What:** 12 free strength training calculators, no account required
- **Cost:** $0. No email gate, no trial wall.
- **Units:** lb and kg on every tool that takes a weight
- **Built by:** Forge, an AI personal trainer app for iOS and Android
- **Forge pricing:** $19.99/month, $59.99/year, or $6.99/week. All plans include a 7-day free trial.

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## The Tools

- **[1RM Calculator](https://forgetrainer.ai/tools/1rm-calculator)** - Estimate your one-rep max from any set, across seven formulas, with reps-in-reserve support and a load chart.
- **[Barbell Plate Calculator](https://forgetrainer.ai/tools/barbell-plate-calculator)** - Type a target weight and get the exact plates per side, or tap plates on the bar to count the total.
- **[Weightlifting Percentage Chart](https://forgetrainer.ai/tools/weightlifting-percentage-chart)** - Turn your max into working weights from 100% down to 30%, with reps and training zones.
- **[Warm-Up Calculator](https://forgetrainer.ai/tools/warm-up-calculator)** - Get a ready-to-run warm-up ramp from the empty bar to your working weight.
- **[RPE Calculator](https://forgetrainer.ai/tools/rpe-calculator)** - Pair your estimated max with a target RPE and rep count to get your working weight.
- **[Body Fat Calculator](https://forgetrainer.ai/tools/body-fat-calculator)** - Estimate body fat with the US Navy tape method or a quick height-and-weight formula.
- **[Lean Body Mass Calculator](https://forgetrainer.ai/tools/lean-body-mass-calculator)** - Calculate lean mass from body fat percentage or the Boer, Hume, and James formulas, with FFMI.
- **[Training Volume Calculator](https://forgetrainer.ai/tools/training-volume-calculator)** - Enter weekly hard sets per muscle and see which muscles sit below, inside, or past the productive range.
- **[DOTS Calculator](https://forgetrainer.ai/tools/dots-calculator)** - Score your powerlifting total with the modern pound-for-pound formula.
- **[Wilks Calculator](https://forgetrainer.ai/tools/wilks-calculator)** - Score your total with the original Wilks formula and the 2020 update, side by side.
- **[Ideal Body Weight Calculator](https://forgetrainer.ai/tools/ideal-body-weight-calculator)** - Run Devine, Robinson, Miller, and Hamwi together, with honest context for lifters.
- **[Personal Trainer Cost Calculator](https://forgetrainer.ai/tools/personal-trainer-cost-calculator)** - Estimate what a human trainer costs per session, month, and year in your city.

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## About Forge

Forge is an AI personal trainer for iOS and Android. It builds a workout plan around your goals, schedule, and equipment, then adapts the plan as you progress. You pick from 4 trainer personalities, chat with your trainer 24/7, and log every set in the app.

These tools answer one question at a time. The app handles the same math automatically during training: it tracks your maxes, sets your working weights, and queues your warm-ups.

- **App Store:** https://apps.apple.com/us/app/forge-ai-personal-trainer/id6758403402
- **Google Play:** https://play.google.com/store/apps/details?id=com.tendylabs.forge
- **Website:** https://forgetrainer.ai

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*Forge Trainer - personal training for everyone.*
*https://forgetrainer.ai/tools*