Train Your Intuition for Unit Conversions.
Unit Sharp is a mental math trainer for estimating conversions. Stop relying on formulas — learn to think in scale, magnitude, and real-world sense.
Not a Converter. A Skill.
Most tools give you exact answers. Unit Sharp trains you to make fast, reasonable estimates — the kind you actually use in real life.
Think in rough magnitudes. Catch bad assumptions. Build intuition for how the world scales.
Free, Forever — No Ads. No Paywalls.
Every Scheer Apps project is a gift — created so everyone can access useful tools, no matter their ability to pay. This app has no ads, no locked features, and no tracking.
A gift means everyone gets the full experience. If you’ve found it useful, you can say thanks in a few small ways.
- ⭐ Rate or share the app to help others discover it
- 💬 Send feedback or feature ideas — I’d love to hear from you
- 🍎 Buy me an apple on Ko-fi (one-time or monthly)
How It Works
A fast feedback loop designed to train estimation, not memorization.
Practice or Timed Modes
Drill specific conversions or push your speed under pressure with timed sessions.
Custom Unit Selection
Focus on the exact categories and conversion pairs you want to master.
Accuracy-Based Scoring
Answers are graded by how close you are — Exact, Close, or Ballpark.
Session Performance Tracking
Your score reflects consistency, not perfection — measured as an average across attempts.
Precision Depends on the Domain
Not all estimates should be equally strict. Unit Sharp adapts expectations based on context.
High Precision
Data, Angle
Exact ≤1% • Close ≤5% • Ballpark ≤15%
Moderate Precision
Length, Mass, Volume, Speed, Area
Exact ≤3% • Close ≤10% • Ballpark ≤25%
Low Precision
Temp, Time, Nautical, Power
Exact ≤5% • Close ≤18% • Ballpark ≤40%
How It Works
Check out the App Below
Frequently Asked Questions
No. It’s designed to train estimation, not give exact answers.
Because real-world thinking relies on fast approximations, not perfect calculations.
Each answer is graded by accuracy tier. Your session score is the average across all attempts.
No. The goal is to build intuition, not memorization.
Yes, the core app will always be free. I make apps because I want them to exist, not as a career. If you've found this app useful, you can support development through voluntary contributions on Ko-fi or by sharing the app with others.
Awesome! I'd love to hear from you. Please use the Send Feedback button above or email me directly at scheerapps@gmail.com. Let me know how I can improve the app.
Yes. I use FireBase for basic anonymous analytics, but that's all. We do not sell your data. Check out the Privacy Policy (linked in the footer) for full details on how we handle your information.
Build Up Your Estimation Muscles Today.
Build intuition. Convert faster. Estimate with confidence.
