1RM Calculator vs One Rep Max
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
1RM Calculator
Estimate your maximum weight lifted for a single repetition. Input your successful lifts and reps to gauge strength, compare progress, and plan future training. Offers advanced features for detailed tracking and analysis.
- Estimate 1-rep max
- Track lift history and progress
- Historical chart and list views
- Multiple estimation formulas
- Calculate multiple rep maxes
- Switch between lbs and kgs
- View percentages of 1-rep max
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1RM Calculator is a tool to help you determine your 1-rep max! Because of the nature and stress of attempting a 1-rep max, this utility allows you to enter in a weight you successfully lifted at the number of reps you performed in order to see what your estimated 1-rep max is. This not only helps give you an idea of the weight to attempt when actually performing a 1-rep max but also to gauge your strength and compare different rep schemes performed at different reps. If one week you were able to bench press 190 lbs at 6 reps and the next week you did 200 for 5, this app gives you a way to compare the two as best as possible (190 lbs @ 6 reps gives a 1-rep max estimate of 223 lbs vs. 200 lbs @ 5 reps gives a 1-rep max estimate of 227 lbs) **** PRO VERSION FEATURES **** Upgrade to the Pro version to get all the settings and features! - Ad free experience - Save your lifts and track your history and progress - Historical chart and list views, categorized by exercise - More formulas in order to best estimate your maximums - Multiple rep maxes (up to 10) - Ability to switch between lbs and kgs - Percentage view that shows anywhere from 50% to 125% of your 1-rep max 1RM Calculator is only intended to give estimates based on the data you enter. Since these are calculated values they may vary with actual measured values. Always ensure you have a spotter, and work your way up to your limit with more than adequate warmup to prevent injuries.
One Rep Max
Safely estimate your maximum lift potential for various strength exercises using scientific formulas. Track your progress visually, set goals, and fine-tune estimates with perceived exertion. Ideal for powerlifters, CrossFit athletes, and strength enthusiasts.
- Precise 1RM calculations with 7 scientific formulas
- RPE integration for fine-tuned estimates
- Custom exercise tracking for any lift
- Visual progress graphs
- Percentage charts for training
- Goal setting and progress monitoring
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Stronger Training, Smarter Progress One Rep Max helps you safely and accurately determine your maximum lift potential for bench press, deadlift, squat, and any other strength exercise - without risking injury. Key Features: • Precise Calculations - 7 scientific formulas for accurate strength predictions: Epley, Brzycki, Lombardi, Mayhew, McGlothin, O'Conner, Wathan • RPE Integration - Factor in Rate of Perceived Exertion to fine-tune your max estimates based on how difficult sets feel • Custom Exercise Tracking - Create and monitor any lift that matters to you • Visual Progress - Beautiful graphs show your strength journey over time • Percentage Charts - Quick reference guide for training percentages • Goal Setting - Set targets and track your path to reaching them Perfect for: • Powerlifters optimizing their training cycles • CrossFit athletes tracking multiple movement patterns • Olympic weightlifters monitoring progress • Strength enthusiasts at any level Advanced Features: • Choose between multiple calculation formulas for different lift types • Track unlimited exercises with custom notes • Rate of Perceived Exertion (RPE) - Fine-tune your 1RM estimates based on how difficult sets feel • Analyze detailed statistics including volume and frequency • Set and monitor progress toward specific strength goals The Science Behind The Numbers: Our app employs multiple validated formulas to estimate your one-rep maximum based on your performance with submaximal weights. This provides you with safe strength targets before attempting potentially risky maximal lifts. Safety Note: Heavy weightlifting should always be performed with proper technique and appropriate spotting. This app provides estimates based on scientific formulas, but individual performance may vary based on experience level and training history. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: 1RM Calculator at none against One Rep Max's shown. 1RM Calculator also leads on iOS requirement (12.1 vs 15.0). One Rep Max's advantage is review sentiment (57% vs 37%) and update cadence (every 6 days vs every 3 weeks). On price, rating, ratings volume and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. 1RM Calculator sells 1 one-off in-app purchase and One Rep Max sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.5 for 1RM Calculator against 4.4 for One Rep Max. Both are backed by a comparable volume of ratings — 222 and 186 respectively. Written reviews are what separate them: 37% of 1RM Calculator's written reviews are positive against 57% of One Rep Max's.
1RM Calculator ships an update every 3 weeks, One Rep Max every 6 days. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.
| Parameter | 1RM Calculator | One Rep Max |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (222 ratings) — better | 4.4 (186 ratings) |
| Positive reviews | 36.8% of reviews | 57.1% of reviews — better |
| Number of ratings | 222 — better | 186 |
| Update frequency | Every 3 weeks | Every 6 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.1 — better | 15.0 |
| Further details — not scored | ||
| Size | 20 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | David Bai | Charles Vanderhoff |
Customer experience
1RM Calculator
One Rep Max
User reviews
1RM Calculator
From 222 App Store ratingsWhat we love
- 👍 Simple and easy to use
- 🚀 Calculates 1 rep max quickly
- 💡 Helps figure out percentages
- 👍 Good for tracking routines
- 👍 Clean design
Room to improve
- 🐛 Pro version not working
- 🐛 Paid features inaccessible
- 🐛 App crashes after upgrade
- 🐛 UI needs improvement
- 🐛 Missing features
One Rep Max
From 186 App Store ratingsWhat we love
- 👍 Easy to use interface
- 📊 Tracks progress with charts
- ➕ Plate calculator bonus feature
- 📈 Supports multiple 1RM formulas
- 💪 Helpful for tracking RMs
Room to improve
- 💰 Subscription required for features
- 💸 Features moved behind paywall
- 😩 Useless without subscription
- 🚫 Basic features now paid
- 💸 High subscription cost
Bugs and requests
1RM Calculator
Reported bugs
8 issues- Pro not working after purchase
- Paid upgrade not granting access
- App crashes after upgrade
- Feedback email link broken
- + button crashes app
Show 3 moreShow fewer
- UI truncated for percentages view
- Cannot use three-digit weight numbers
- App crashes after upgrade
Requested features
7 requests- Ability to re-arrange exercises
- Ability to re-name exercises
- Ability to delete exercises
- See all trend lines on one graph
- Track more than one set per day
Show 2 moreShow fewer
- Allow decimals in weight input
- Dark mode
One Rep Max
Reported bugs
13 issues- Features behind paywall
- Forced ads
- Deleted lifting history
- Lost all logs with update
- Weight limit restriction
Show 8 moreShow fewer
- Reloads excessively
- Wonky and now dead
- Complicated and too much offered
- Not intuitive for tracking
- Buggy about dates and lifts
- Cannot select other lifts
- Only logs back squats
- App copying content from clipboard
Requested features
7 requests- Allow editing of logs (date/time)
- Manual entry for weight preferred over slider
- Include different 1RM formulas (Epley, Brzycki)
- Ability to create custom graphs
- Fix weight limit restriction
Show 2 moreShow fewer
- Allow logging of more than 1073 pounds
- Update app
In-app purchases
1RM Calculator
- Pro Upgrade$1.99
One Rep Max
- 1RM Pro Monthly$2.991 Month
- 1RM Pro Annual7 Days trial$19.991 Year
Questions
Is 1RM Calculator free?
Is One Rep Max free?
Which has better reviews, 1RM Calculator or One Rep Max?
Do 1RM Calculator or One Rep Max have ads?
Which is updated more often, 1RM Calculator or One Rep Max?
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