# Drill Calc vs Drill Bit Converter

The clearest difference is update cadence: Drill Calc at every 18 months against Drill Bit Converter's every 54 months. Drill Bit Converter's advantage is price ($0.99 vs $2.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Drill Calc costs $2.99 and Drill Bit Converter $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Drill Calc ships an update every 18 months, Drill Bit Converter every 54 months. The most recent releases landed on August 12, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Drill Calc | Drill Bit Converter |
| --- | --- | --- |
| Price | $2.99 | **$0.99** |
| Rating | **[4.1 (19 ratings)](https://appshunter.io/ios/app/drill-calc/id304434324/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 91.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 18 months** | Every 54 months |
| Monetization | Paid | — |
| Size | 5 MB | 2 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [Dohmann Engineering Services](https://appshunter.io/developer/401682475) |

## What reviewers say

### Drill Calc

[App page](https://appshunter.io/ios/app/drill-calc/id304434324)

This utility app helps you determine the correct drill bit size for threaded holes. It supports both inch and metric threads, calculates close and tight fit hole sizes, and provides tables for standard drill bit sizes and pipe information.

**Highlights:** Calculates drill bit size for threaded holes, Supports inch and metric threads, Displays close and tight fit hole sizes, Includes standard inch fractional and numeric drill bit tables, Provides pipe size information, Offers data on common wood screw sizes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Drill Bit Converter

[App page](https://appshunter.io/ios/app/drill-bit-converter/id1552080952)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Drill Calc free?

Drill Calc costs $2.99, with no in-app purchases.

### Is Drill Bit Converter free?

Drill Bit Converter costs $0.99, with no in-app purchases.

### Do Drill Calc or Drill Bit Converter have ads?

Neither Drill Calc nor Drill Bit Converter shows ads.

### Which is updated more often, Drill Calc or Drill Bit Converter?

Drill Calc ships an update every 18 months, and Drill Bit Converter every 54 months. Most recently, Drill Calc was updated on August 12, 2026 and Drill Bit Converter on September 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*