# Formulary: Formula Calculator — Physics, Math & Engineering

> Physics, Math & Engineering (iPhone/iPad app by ERDINC ERSOY.)

- Source: https://appshunter.io/ios/app/formulary-formula-calculator/id6759667177 (this page in markdown: same URL + `.md`)
- Developer: [ERDINC ERSOY](https://appshunter.io/developer/1860801978)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 18 MB
- Languages: American English
- Released: 2026-03-02
- Data updated: 2026-11-13

## What is Formulary?

Solve any formula for any variable, and see every step of the working.

Formulary+ holds 4,800+ formulas from physics, math, chemistry and 13 fields of engineering. Pick a formula, choose the unknown, type what you know, and get the answer with each step shown. It works offline, so you can use it in class or the lab.

SOLVE, CHECK, LEARN

• Formula calculator: choose the unknown, enter the rest, and see the answer worked out step by step. Thousands of formulas have one.
• Checks: put your own numbers into an identity or a bound and see whether it holds, and by how much.
• Worked examples: a full calculation with real numbers for the harder equations.
• Notes: write on any formula and export them as Markdown.

FREE TOOLS

• Unit converter: 16 quantities and about 150 units
• Physical constants: 61 values at full CODATA 2022 precision
• Search by name, by symbol, or with a typo
• Real LaTeX rendering, with every variable defined and its SI unit given

16 DISCIPLINES

Mathematics · Physics · Chemistry · Geometry · Mechanical · Electrical · Civil · Chemical · Environmental · Geological Engineering · Computer Science · Biology & Biomedical · Geophysics · Geochemistry · Meteorology · Astronomy & Astrophysics

Also: financial math (loans, annuities, CAPM, WACC) and clinical calculations (QTc, drip and infusion rates).

BUILT FOR

Engineering and science students · exam prep (FE, PE, GRE, AP, A-level) · teachers · engineers in the field

FREE TO TRY

Browse and search everything for free. Open 5 formulas a day, and solve 1 formula a day in full. Formulary Pro removes both limits and unlocks checks, worked examples and notes. Choose a yearly subscription or a one-time Lifetime purchase.

Formulary Pro Yearly is an auto-renewable subscription. Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel it in your Apple Account settings.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://kingerders.github.io/formulary/privacy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly | $19.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime | $39.99 | one-time |


## Is Formulary safe?

Not enough ratings yet to assess Formulary.

## Is Formulary legit?

Formulary: Formula Calculator appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Formulary is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 3.3 — 2026-11-12

• Solve one formula free every day, with the answer and every step of the working
• 31 new formulas, each with a solver: camera exposure and depth of field, musical pitch, heart-rate zones and race times, discounts, VAT and share valuation, LED resistors, motor slip and battery C-rate, pressure and density altitude
• Clearer formulas: equations read ½·m·v² instead of 0.5*m*v^(2), and physical constants show true subscripts
• A clearer upgrade screen: plans first, the yearly price per month, one button to continue
• Fixed: formulas in Recently Viewed did not open on iPhone

### 3.2 — 2026-10-29

• Unit converter: 16 quantities and about 150 units, including length, pressure, energy, temperature and data. Type one value and see every unit at once
• Physical constants: 61 values at full CODATA 2022 precision, with uncertainties. Exact ones are marked, and you can search and tap to copy
• 57 new formulas, each with an interactive solver: loans, annuities, bond prices, CAPM and WACC; clinical calculations such as QTc and drip and infusion rates; overshoot and settling time; effect size and Welch's t-test; radio-link basics
• Recently viewed formulas are now one tap away on iPhone, from the home screen

### 3.1 — 2026-10-10

• 83 new formulas, nearly all with an interactive solver — including a new Financial Mathematics section (compound interest, mortgage payments, CAGR, Rule of 72) and Clinical & Physiological Calculations (BMI, BMR, target heart rate, body surface area)
• Smarter search: find formulas by symbol (ρ, Δ, E = mc²), by another name (Pythagoras, Einstein) and despite typos
• Choose your disciplines — they come first on the home screen, with your recent formulas, favourites and solvers from your subjects
• iPad: a three-column layout and keyboard shortcuts (⌘F search, ⌘1–9 disciplines, ⌘D favourite)
• Solvers can now be set up before subscribing, so you can see exactly what Pro does
• Favourites and notes now stay attached to a formula even when its title is corrected
• Restore Purchases now tells you what it found
• Pricing: Yearly $19.99 · Lifetime $39.99. The monthly plan is no longer offered; current monthly subscriptions continue unchanged.

### 3.0 — 2026-09-10

Formulary+ 3.0 — The biggest update yet. Your formulas can now compute.

NEW: Interactive Solver
Pick any variable in a formula, enter the known values, and get the answer — with full step-by-step solutions. Over 1,500 formulas now have a built-in solver. Look for the SOLVER badge on any formula.

NEW: Evaluator
Identities, bounds, and convergence tests now have an interactive check. Plug in numbers and see both sides computed in real time. Look for the CHECK badge.

NEW: Worked Examples
Tensor equations, PDEs, and multi-step procedures now ship with a fully computed example — every substitution shown. Look for the EXAMPLE badge.

NEW: Freemium Model
The catalog is no longer locked by discipline. Browse everything, search everything, read 5 formulas per day for free. Formulary Pro unlocks the solver, evaluator, worked examples, and notes.

More in this release:

• 4,727 formulas — up from 3,899
• Formula sharing — export as LaTeX, plain text, or rendered image
• Notes export — download all your notes as a Markdown file
• Backup & restore — save your favorites and notes, restore on any device
• Recents — quickly return to formulas you just viewed
• Redesigned editorial UI — paper-white aesthetic, serif typography, discipline accent colors
• Faster search with rebuilt index
• Dark mode fully supported

Pricing:
• Free: full catalog browsing + 5 formulas/day
• Monthly: $1.99/mo
• Yearly: $19.99/yr
• Lifetime: $29.99 — one payment, forever

Thank you for using Formulary+. If something looks off, reach out via the Support URL — every report makes the next version better.

### 2.2.0 — 2026-08-14

• Expanded Interactive Solver — now available for 128 formulas across all 16 disciplines.
• Solver Indicators — formula lists now display a small function icon when an interactive solver is available.
• Improved Scientific Inputs — more reliable calculations for very large, very small, and negative values.
• Expanded Formula Library — new formulas, refined explanations, and corrected mathematical notation.
• More Accurate Library Counts — formula and category totals now remain in sync with the latest catalog.
• Stability & Performance Improvements — safer data updates, improved migration handling, and various bug fixes.

Thank you for using Formulary+!

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## More apps by ERDINC ERSOY

- [Vocablog](https://appshunter.io/ios/app/vocablog/id6756478869)
- [Kuruşum](https://appshunter.io/ios/app/kurusum/id6773300929)

All apps by ERDINC ERSOY: https://appshunter.io/developer/1860801978

## Related topics

[runic formulas](https://appshunter.io/ios/topics/runic-formulas)

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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 2026-11-13.*