Trade-planning values depend on one another, which makes repeated manual calculations slow and error-prone. The calculator keeps stop-loss price and percentage, target price and percentage, quantity and position amount, risk, reward, and expected profit synchronized as inputs change.
Trading CalculatorLive
Universal Trading Calculator
A cross-platform trading calculator with interconnected entry, stop-loss, target, quantity, position-size, risk, reward, and profit calculations.
Trade plan
Entry ₹ 1,245Stop-loss ₹ 1,210Target ₹ 1,330
Position size142Risk / reward1 : 2.4
About Universal Trading Calculator
Universal Trading Calculator is an Expo and React Native application for web, Android, and iOS. Traders can enter available values such as entry, stop-loss, target, quantity, position amount, or risk amount and receive the related planning values immediately.
Product thinking
Challenge and approach
The calculation model uses bi-directional dependencies: changing a stop-loss or target price updates its percentage, while changing the percentage recalculates the price. Quantity and position amount follow the same relationship, and validation highlights inputs still required to complete a scenario.
Capabilities
Main features
Real-time calculations from any supported field input
Bi-directional stop-loss, target, quantity, and position relationships
Risk amount, risk-reward ratio, and expected profit calculations
Negative-value protection and missing-field validation
Responsive two-column layout with light and dark themes
Web, Android, iOS, Expo Go, APK, and app-store build workflows
Architecture
How the system is structured
- 01
App.js provides the Expo entry point and registers the React Native application.
- 02
CalculatorScreen contains the connected calculation logic and form interface.
- 03
A shared styles module defines the responsive layout and light or dark themes.
- 04
Expo and EAS profiles support web deployment and mobile build outputs.
Implementation
Technology and data
Technology stack
- React Native
- Expo
Use cases
What the project supports
- Estimate position size from a defined risk amount
- Compare stop-loss and target scenarios
- Calculate expected profit and risk-reward
- Use the same calculator on web, Android, or iOS