Batrium BMI vs Tire Size Calculator +
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Batrium BMI
Monitor the real-time status of your home or large capacity battery system. View crucial battery parameters like cell voltage, overall voltage, current flow, and internal BMS temperature.
- Real-time battery parameter updates
- Cell voltage monitoring
- Battery voltage display
- Current flow tracking
- Internal BMS temperature
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This application will enable you to monitor the state of your home/large capacity battery. - Watchmon BMS displays all important battery parameters and updates them in real time. - Cell Voltage, battery voltage, real time current flow, battery and internal BMS temperature
Tire Size Calculator +
Calculate tire size differences, speedometer errors, and wheel offset changes. Compare tire dimensions, find alternative sizes, and visualize wheel fitment. Save your car's tire sizes for quick access.
- Compare two tire sizes
- Calculate speedometer and odometer error
- Find plus and alternative tire sizes
- Analyze wheel offset and rim width
- Reference sidewall information
- Save car tire sizes to 'My Garage'
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Tire size calculator for anyone changing tires or wheels: compare two tire sizes, see the speedometer error, find plus sizes and check how a new wheel offset moves the rim in or out. ▶ Compare two tire sizes Pick the current and the new size, for example 225/45R17 against 235/40R18, and read the difference in overall diameter, sidewall height, circumference, ride height and revolutions per km or mile. Both tires are drawn to scale on top of each other, so the size change is easy to see. • Metric sizes and flotation sizes such as 31x10.50R15 • Switch between mm and inches at any time ▶ Speedometer and odometer error A bigger or smaller tire changes how far the car travels per wheel turn. The table shows what you really drive when the speedometer reads 30, 50, 60, 80, 100 or 120 km/h (20 to 80 mph in inch mode), plus the odometer error in percent. ▶ Plus sizes and alternative sizes Enter a base size and get the metric sizes (widths 135–355, rims 13–24) within ±3% of its overall diameter, grouped by rim so a plus-one or plus-two is easy to plan. Tap a size to open it straight in the comparison. ▶ Wheel offset and rim width New in this version. Enter rim width (4 to 13 J) and offset (ET −50 to +70 mm) for the current and the new wheel. The app shows how many millimetres the outer edge moves out, how much closer the inner edge gets to the suspension, the change at the tire edges and the backspacing, with a to-scale cross-section of both wheels. ▶ Read the sidewall Reference tables for P, LT, XL and RF, speed ratings from L to (Y) in km/h and mph, and load index 60 to 130 in kg and lb. ▶ My Garage Save the sizes of your cars and load one back with a single tap. All calculations run on your device and need no account. Good to know: results are geometric estimates from the size markings. Real tire width changes with the rim, and backspacing assumes a 12.7 mm flange. The app does not say whether a wheel will fit your car. Always confirm fitment and clearance with your vehicle manual or a tire professional.
Screenshots
Verdict
The clearest difference is rating: Batrium BMI at 3.0 against Tire Size Calculator +'s 1.0. Batrium BMI also leads on ads (none vs shown) and monetization model (free vs ad-supported). Tire Size Calculator +'s advantage is update cadence (every 2 weeks vs every 6 weeks). On price, 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. Neither carries in-app purchases, so what you see is what you pay.
Batrium BMI holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Batrium BMI ships an update every 6 weeks, Tire Size Calculator + every 2 weeks. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.
| Parameter | Batrium BMI | Tire Size Calculator + |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 6 weeks | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.2 — better | 16.4 |
| Further details — not scored | ||
| Size | 61 MB | 49 MB |
| Age rating | 4+ | 17+ |
| Developer | Batrium Technologies Pty Ltd | heekyung moon |
In-app purchases
Batrium BMI
No in-app purchases
Tire Size Calculator +
No in-app purchases
Questions
Is Batrium BMI free?
Is Tire Size Calculator + free?
Which has better reviews, Batrium BMI or Tire Size Calculator +?
Do Batrium BMI or Tire Size Calculator + have ads?
Which is updated more often, Batrium BMI or Tire Size Calculator +?
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