Comparison

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.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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.

Screenshots

Belt Length Calculator Pro4 screens
Thread Calculators4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Belt Length Calculator Pro ships an update every 41 months, Thread Calculators every 10 months. Both last shipped on November 3, 2026.

Scorecard6 real differences · 4 level
Belt Length Calculator Pro versus Thread Calculators: the parameters behind the verdict, then further details
ParameterBelt Length Calculator ProThread Calculators
Price$2.99$1.99 — better
Rating2.3 (3 ratings)5.0 (1 ratings) — better
Positive reviews25.0% of reviews100.0% of reviews — better
Number of ratings3 — better1
Update frequencyEvery 41 monthsEvery 10 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.113.0 — better
Further details — not scored
Size1 MB51 MB
Age rating4+4+
DeveloperImran PinjaraKantaben Gorasiya

Customer experience

Belt Length Calculator Pro

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

Thread Calculators

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Belt Length Calculator Pro

No in-app purchases

None

Thread Calculators

No in-app purchases

Questions

Is Belt Length Calculator Pro free?
Belt Length Calculator Pro costs $2.99, with no in-app purchases.
Is Thread Calculators free?
Thread Calculators costs $1.99, with no in-app purchases.
Which has better reviews, Belt Length Calculator Pro or Thread Calculators?
Thread Calculators is rated higher. Belt Length Calculator Pro averages 2.3 out of 5 from 3 ratings, while Thread Calculators averages 5.0 from 1 ratings.
Do Belt Length Calculator Pro or Thread Calculators have ads?
Neither Belt Length Calculator Pro nor Thread Calculators shows ads.
Which is updated more often, Belt Length Calculator Pro or Thread Calculators?
Belt Length Calculator Pro ships an update every 41 months, and Thread Calculators every 10 months. Most recently, Belt Length Calculator Pro was updated on November 3, 2026 and Thread Calculators on November 3, 2026.

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