Looking for a budget-friendly calculator? Read our detailed review of the OREVA OR-400 calculator, its features, specifications, and comparison with competitors.

Table of Contents

1. Introduction
2. Features in Brief
3. Detailed Specifications
4. Performance & Usability
5. Should You Buy It?
6. Comparison with Competitors
7. Final Verdict

Introduction

The OREVA OR-400 Calculator is a compact, efficient, and affordable device designed for everyday calculations in offices, schools, and homes. With essential features like a 12-digit display, 120-step check function, and dual power support, it targets users who need reliability without spending much.

Available in White and Grey, this calculator is built for durability and convenience. Whether you are a student managing daily math problems or an office worker handling quick calculations, the OR-400 aims to deliver consistent performance at a budget price.

Features in Brief

• 12-digit large display for clear visibility
• 120-step check function to review past calculations
• Auto replay feature for quick rechecking
• Check & Correct function to fix errors easily
• Dual power (Solar + Battery) for uninterrupted usage
• Compact and lightweight design (104g)
• Memory functions (M+, M-, MRC)
• Durable body with hangable box packaging

These features make it a practical choice for everyday usage. The calculator is especially useful for people who frequently verify calculations, thanks to its step-check functionality.

Detailed Specifications

• Brand: OREVA
• Model Number: OR-400
• Weight: 104 grams
• Display Size: 80 mm × 23 mm
• Character Size: 4.5 mm × 16 mm
• Body Dimensions: 124 × 139.5 × 30 mm
• Display Type: 12-digit
• Power Source: Solar + Battery
• Battery Type: LR44 × 1
• Memory: M+, M-, MRC
• Warranty: 6 months (manufacturing defects only)

The calculator is designed with a large display and ergonomic buttons, ensuring comfortable usage even for long sessions.

Performance & Usability

The OREVA OR-400 performs well for basic to moderate calculations. The 120-step check function is one of its standout features, allowing users to go back and verify calculations without starting over.

The auto replay and check & correct functions make it especially helpful for accountants, shopkeepers, and students who frequently need to revise entries.

Its dual power system ensures reliability, as it automatically switches between solar and battery depending on lighting conditions.

However, it is important to note that this is a basic calculator, not suitable for advanced scientific or engineering calculations.

Should You Buy It?

👍 Buy it if:

• You need a budget-friendly calculator
• You want basic arithmetic and checking features
• You prefer durable and lightweight design
• You work in offices, shops, or schools

👎 Avoid it if:

• You need scientific or advanced functions
• You want premium build quality or brand reputation like Casio
• You require GST or financial-specific advanced features

Overall, the OREVA OR-400 is a value-for-money product, typically priced around ₹250–₹350 in India, making it accessible for most users.

Comparison with Competitors

Oreva OR-400 12 Digit Check & Correct Calculator 

Affordable 12-digit calculator with check & correct and dual power support.Orpat 400GT Calculator · –

Popular alternative with similar features and slightly better brand recognition.Oreva OR-512 GT Calculator ·

Upgraded Oreva model with GST and enhanced functionality.

Product Comparison Table

Key Takeaways

• OREVA OR-400 → Best for budget buyers
• Orpat 400GT → Better brand trust and durability
• OREVA OR-512 GT → Ideal for GST calculations

Final Verdict

The OREVA OR-400 Calculator is a solid choice for anyone looking for a simple, reliable, and affordable calculator. It covers all essential features like step checking, error correction, and dual power, making it highly practical for daily use.

While it may not compete with premium brands in terms of build quality or advanced features, it excels in delivering maximum value at a minimal cost.

👉 Rating: 4/5
👉 Best for: Students, shopkeepers, and office use