Belt Length Calculator Pro vs Thread Calculators
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Belt Length Calculator Pro
Calculate the required belt length for drive systems using open or cross belt arrangements. Input pulley diameters and center distance to get the precise belt length needed.
- Open belt arrangement calculation
- Cross belt arrangement calculation
- Input large pulley diameter
- Input small pulley diameter
- Input center length of pulleys
- Provides belt length output
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Belt Length Calculator is a practical mechanical engineering tool for calculating belt length, pulley speed ratio, and belt speed for common belt drive systems. Designed for mechanical engineers, maintenance engineers, plant technicians, machine designers, workshop professionals, and engineering students, the app provides fast and convenient calculations for belt and pulley systems used in industrial machinery and mechanical equipment. The application helps reduce manual calculations and provides useful reference values for belt selection, machine design, maintenance, troubleshooting, and drive system analysis. Included Calculators • Open Belt Length Calculator • Cross Belt Length Calculator • V-Belt Length Calculator • Speed Ratio Calculator • Belt Speed Calculator Open Belt Length Calculate the required belt length for open belt drive arrangements. Enter: • Large Pulley Diameter • Small Pulley Diameter • Center Distance The calculator provides the calculated belt length along with the relevant input and reference values. Cross Belt Length Calculate belt length for crossed belt drive arrangements. Enter the large pulley diameter, small pulley diameter, and center distance to determine the required belt length. This is useful when designing or checking crossed belt drive systems. V-Belt Length Calculate belt length for V-belt drive systems using the appropriate belt length calculation method. This calculator is useful for V-belt selection, replacement, machine maintenance, and mechanical drive design. Speed Ratio Determine the speed relationship between driver and driven pulleys. Enter: • Driver Pulley Diameter • Driven Pulley Diameter • Driver RPM Calculate: • Speed Ratio • Driven Pulley RPM This helps analyze pulley relationships and determine the resulting driven speed. Belt Speed Calculate the linear speed of a belt based on pulley diameter and rotational speed. Results are provided in: • m/s for Metric units • ft/s for Imperial units Features • Open belt length calculation • Cross belt length calculation • V-belt length calculation • Pulley speed ratio calculation • Driven pulley RPM calculation • Belt speed calculation • Metric and Imperial units • Automatic unit conversion • Clear calculation results • Accurate mechanical engineering formulas • Simple and professional interface • Fast calculations • No internet connection required Applications Belt Length Calculator is useful for: • Mechanical Design • Belt Drive Design • Machine Design • Industrial Machinery • Plant Maintenance • Equipment Maintenance • Power Transmission Systems • Workshop Engineering • Manufacturing Equipment • Mechanical Troubleshooting Designed For • Mechanical Engineers • Design Engineers • Maintenance Engineers • Plant Engineers • Machine Designers • Workshop Technicians • Maintenance Technicians • Industrial Professionals • Engineering Students Whether you are selecting a replacement belt, checking an existing pulley system, designing a belt drive, calculating machine speed, or troubleshooting mechanical equipment, Belt Length Calculator provides a convenient engineering reference for everyday belt drive calculations. The app combines multiple belt and pulley calculations in one simple tool, helping save time, reduce manual calculation errors, and improve efficiency during mechanical design and maintenance work.
Thread Calculators
This app provides precise thread-cutting data for various international standards. It assists machinists, engineers, and CNC professionals in quickly finding essential measurements and detailed tables for thread dimensions and cutting values.
- Supports international thread standards (M, UNC, NPT, etc.)
- Tap Hole Size Calculator
- Bolt Diameter Guide
- Tap Hole Forming Data
- Tap Hole Repair Values
- Detailed thread dimension tables
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Get quick and accurate thread-cutting data with this complete thread calculator app. It supports a wide range of international thread standards, including M, MF, UNC, UNF, UNEF, UNR, UNS, NPT, NPTF, NPSC, NPSF, NPSL, NPSM, BA, BSP, BSF, BSW, BSPP, TR, and TRF. Whether you're a machinist, engineer, or CNC professional, this app helps you find the right measurements instantly. Access detailed tables for thread dimensions and cutting values in one place. Key tools included: - Tap Hole Size Calculator – Find the correct drill size for perfect threading - Bolt Diameter Guide – Quickly check standard bolt dimensions - Tap Hole Forming Data – Accurate values for forming taps - Tap Hole Repair Values – Fix damaged threads with the correct specs This app is your handy companion for fast, reliable, and precise thread-cutting calculations.
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Verdict
The clearest difference is review sentiment: Thread Calculators at 100% against Belt Length Calculator Pro's 25%. Thread Calculators also leads on rating (5.0 vs 2.3) and update cadence (every 10 months vs every 41 months). Belt Length Calculator Pro's advantage is ratings volume (3 vs 1). On ads, in-app purchases, monetization model and device support 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
Belt Length Calculator Pro costs $2.99 and Thread Calculators $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Thread Calculators holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 25% of Belt Length Calculator Pro's written reviews are positive against 100% of Thread Calculators's.
Belt Length Calculator Pro ships an update every 41 months, Thread Calculators every 10 months. Both last shipped on November 3, 2026.
| Parameter | Belt Length Calculator Pro | Thread Calculators |
|---|---|---|
| Price | $2.99 | $1.99 — better |
| Rating | 2.3 (3 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 25.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 41 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.1 | 13.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | Imran Pinjara | Kantaben Gorasiya |
Customer experience
Belt Length Calculator Pro
Thread Calculators
In-app purchases
Belt Length Calculator Pro
No in-app purchases
Thread Calculators
No in-app purchases
Questions
Is Belt Length Calculator Pro free?
Is Thread Calculators free?
Which has better reviews, Belt Length Calculator Pro or Thread Calculators?
Do Belt Length Calculator Pro or Thread Calculators have ads?
Which is updated more often, Belt Length Calculator Pro or Thread Calculators?
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