# RefCalc: All-in-One Calculator — Calculator, Converter & Tools

> Calculator, Converter & Tools (iPhone/iPad app by Lam Nguyen.)

- Source: https://appshunter.io/ios/app/refcalc-all-in-one-calculator/id1636416755 (this page in markdown: same URL + `.md`)
- Developer: [Lam Nguyen](https://appshunter.io/developer/843676921)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 59 MB
- Languages: American English, Hindi, Indonesian, Malay, Brazilian Portuguese, European Spanish, Thai, Vietnamese
- Released: 2022-08-06
- Data updated: 2026-10-23

## What is RefCalc?

RefCalc puts 123 calculators, converters and everyday tools in one fast, clean app. Work out a loan payment, convert units, count the days between two dates, check your BMI or create a QR code without switching apps. Almost everything runs on your device and works offline.

WHY REFCALC
- 123 tools in one app, grouped into clear categories
- Works offline: calculations never need the internet
- No account and no sign-up
- Search any tool by name in a second
- Star your favorites and jump back to recent tools
- Calculation history stays on your device; clear it anytime
- Copy results with one tap
- Light and dark themes
- Available in English, Spanish, Portuguese, Hindi, Indonesian, Malay, Thai and Vietnamese

MATH
Basic and scientific calculator, percentage, percentage change, fractions, average, median, statistics, standard deviation, sample size, circle, triangle, shape area and volume, Pythagorean theorem, quadratic equation, combinations (nCr) and permutations (nPr).

MONEY AND BUSINESS
Loan, mortgage, EMI, amortization schedule, simple and compound interest, savings, retirement, debt payoff, investment return, ROI, CAGR, NPV, inflation, salary, hourly wage, overtime pay, tip, split bill, discount, VAT / GST, profit, profit margin, markup, pricing, break-even, commission, revenue, ROAS, CPC, CPA, CAC, customer lifetime value, LTV to CAC, burn rate, runway, growth rate, marketplace fee and dropshipping profit. Currency converter with exchange rates saved for offline use.

DATE AND TIME
Age, date difference, add or subtract days, working days, add business days, countdown, birthday countdown, week number, duration, time difference and time zone converter.

HEALTH AND FITNESS
BMI, BMR, TDEE, daily calories, macro split, ideal weight, body fat, water intake, running pace, running finish time, steps to distance and pregnancy due date.

UNIT CONVERTERS
Length, weight, temperature, area, volume, speed, time, data size, data rate, angle, fuel economy and fuel cost.

ELECTRICAL
Ohm's law, electrical power, voltage drop, battery runtime, resistors in series or parallel, three-phase power, and voltage, current and charge converters.

GRADES
GPA, weighted grade, final grade and required exam score.

HANDY TOOLS
QR code creator and reader (links, text, Wi-Fi, contact cards, events and more), JSON formatter, Base64, SHA digest, UUID and ULID generator, number base converter, Unix timestamp, word counter, password and passphrase generator, random number, IBAN checker, phone calling codes, Roman numerals and number to words.

PRIVATE BY DESIGN
Your inputs are calculated on your device. QR images, passwords, IBANs and pregnancy dates are never saved to history. The app goes online only for currency rates and ads.

FREE WITH OPTIONAL REMOVE ADS
Every tool is free. RefCalc is supported by ads. If you prefer an ad-free experience, a one-time "Remove ads" purchase turns off all ads for good. No subscription. You can restore it on the same store account.

Important: health, finance and tax results are estimates for information only. They are not medical, financial, tax or legal advice.

Questions or ideas? Use "Rate RefCalc" in the app menu. We read every review.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |
| Buy 10 gems | $0.99 | one-time |
| Buy 250 gems | $2.99 | one-time |
| Buy 50 gems | $1.99 | one-time |


## Is RefCalc safe?

Not enough ratings yet to assess RefCalc.

## Is RefCalc legit?

RefCalc: All-in-One Calculator appears to be a legitimate app. The AppsHunter Legitimacy Score for RefCalc is 90 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 2.0.0 — 2026-10-22

- 123 calculators, converters and tools in one app
- Math, money, business, date and time, health, units, electrical, grades and developer tools
- Works offline; currency rates update when you're online
- Favorites, recent tools and calculation history on your device
- QR code creator and reader
- Light and dark themes, 8 languages
- Optional one-time purchase to remove ads

Thanks for trying RefCalc. Your rating and feedback help us improve.

### 1.0.6 — 2023-01-26

Bug fixes and update performance improvements

### 1.0.2 — 2022-08-06

No release notes.

## More apps by Lam Nguyen

- [Word Blocks Connect](https://appshunter.io/ios/app/word-blocks-connect/id1229002210)
- [Royale Decks: Brawl Stats](https://appshunter.io/ios/app/royale-decks-brawl-stats/id1248182286)
- [Clasher Maps of Clans](https://appshunter.io/ios/app/clasher-maps-of-clans/id1248667281)
- [MC Crafting Desk](https://appshunter.io/ios/app/mc-crafting-desk/id1250837525)
- [CS:Guider](https://appshunter.io/ios/app/csguider/id1258028236)
- [Bubble Shooter - Cat Rescue](https://appshunter.io/ios/app/bubble-shooter-cat-rescue/id1281406585)

All apps by Lam Nguyen: https://appshunter.io/developer/843676921

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-23.*