Discreet Watch UI
Use Apple Watch Digital Crown input for fast, discreet calculations.
Scrap gold calculator
Calculate Scrap Gold Value in Seconds.
KaratMaster is a fast offline gold calculator for weight, karat, spot price and payout calculations — with Apple Watch Digital Crown input.
Offline calculation • No account required
Everything a gold counter needs. Nothing it doesn’t.
Instant Scrap Value
Enter weight, karat and spot price to estimate scrap gold value instantly.
Offline Engine
All core calculations happen locally on your device.
Spot Widget
Keep your saved gold price visible from your Lock Screen.
Karat Support
Quickly switch between common gold purities.
Payout Control
Apply your own payout percentage and deductions.
Calculation History
Keep previous calculations available on your device.
Transparent Math
See exactly how weight, purity, spot price and payout produce the result.
How it works
Weight → Karat → Calculate. The math is always shown.
- Enter the weight in grams
- Tap the karat — 24K to 9K or custom
- Confirm your own spot price and payout
- Read the estimate with every step explained
Example: 10 g of 18K gold
Pure gold10.00 g × 75.0 %7.500 g
Gross value7.500 g × $100.00$750.00
After payout$750.00 × 85 %$637.50
Deductionfixed amount−$10.00
Estimated value$637.50 − $10.00$627.50
Spot price is user-provided. KaratMaster never downloads or guesses market prices.
Right from your wrist.
Turn the Digital Crown to set the weight in 0.01 g steps, turn again to pick the karat, confirm the synced spot price — done. Subtle haptics confirm each step, and the watch keeps your last synced prices when your iPhone is out of reach.
Your gold price, one glance away.
Lock Screen and Home Screen widgets show your saved spot price, a quick value for your last calculation and a per-gram table for every common karat. A Control Center button opens the calculator directly.
Karat and purity at a glance
Simple pricing
No subscription. No account.
Free
$0
3 successful calculations
- Basic calculator
- Common karats
- Offline engine
- Calculation results
Lifetime
$19.99
one-time purchase
- Unlimited calculations
- Apple Watch Digital Crown
- Lock Screen widgets
- History
- Saved presets
- Advanced calculation details
- Offline engine
Price shown in USD. The App Store shows the price for your country.
Private by design
No account, no analytics, no tracking and no cloud database. Calculations run on your device and your history stays there. Purchases are handled by Apple.
Read the privacy policy →Questions
Does KaratMaster show live gold prices?
No. You enter the spot price yourself, and KaratMaster shows when you last changed it. This keeps every calculation offline and transparent.
Which karats are supported?
24K (1000), 22K (916.7), 21K (875), 18K (750), 14K (585), 10K (417) and 9K (375) — plus any custom fineness or karat.
What counts as a free calculation?
Only a valid calculation that produces a result. Opening the app, editing fields or invalid input never count. The third result is fully shown and can be saved before the purchase screen appears.
Does it work without internet?
Yes. The calculation engine, history, widgets and Apple Watch app all work offline.
Is this financial advice?
No. KaratMaster is a calculation tool. Values are estimates based on the prices and settings you enter; actual purchase, refining and market prices may differ.
Values are estimates based on the prices and settings entered by the user. Actual purchase, refining and market prices may differ. KaratMaster is not a bank, exchange, trading platform or financial advisor.