Precision Metric - Converter

Convert any unit with precision you can trust.

Precision Metric is a fast, accurate unit converter with 234 units across 30 categories. Every calculation uses NIST-verified conversion factors with up to 50-digit internal precision. No ads. No tracking. Works completely offline.

FEATURES: • 30 categories: Length, Mass, Temperature, Volume, Time, Area, Speed, Pressure, Energy, Force, Torque, Frequency, and more • Compound unit input — enter values as 5ft 3in or 2lb 8oz • Batch convert — convert dozens of values at once and share as CSV • Significant figures mode with dp/sf toggle • Conversion audit trail — see the exact factor, source, and math • Industry quick sheets for Cooking, Construction, Engineering, Science, and Medical • Real-time conversion as you type • Pair search — type "miles to km" and go straight to converting • Save favorite conversion pairs • Haptic feedback on key actions

FREE TO USE: • 7 everyday categories with common units • Up to 4 decimal precision • 5 saved conversions, 10 history entries • All features except Pro units and extended precision

UPGRADE TO PRO (one-time purchase): • All 30 categories and 234 units • Up to 15 decimal precision and sig figs • Unlimited saves and history • Batch conversion and CSV export • Conversion audit trail with NIST sources • Pay once, yours forever — no subscriptions

BUILT FOR PROFESSIONALS: • NIST and SI verified conversion factors • Arbitrary-precision math — no floating-point errors • Compound units: feet+inches, pounds+ounces, hours+minutes+seconds • Temperature: Celsius, Fahrenheit, Kelvin, and Rankine • Every factor traceable to international reference standards

Works offline. No data collected. No ads. No tracking. Your conversions stay on your device.