OneTool – 22 Free Online Calculators for Finance, Health & Math

Estimate mortgage payments, compare income tax across 30+ countries, check BMI, convert currencies & track gold prices. No signup — instant results on any device.

Finance Tools

Mortgage Calculator - Calculate monthly payments, total interest, and amortization schedules
Loan Calculator - Compute loan payments with detailed breakdown
Compound Interest Calculator - See how your investments grow over time
Currency Converter - Real-time exchange rates for 150+ currencies
Gold Price Lookup - Live gold prices with historical charts
Oil Price Lookup - Brent and WTI crude oil prices

Health & Fitness Tools

BMI Calculator - Calculate your Body Mass Index
Calorie Calculator - Daily calorie needs based on your goals
BMR Calculator - Basal Metabolic Rate calculation
Body Fat Calculator - Estimate body fat percentage

Math & Education Tools

Percentage Calculator - All percentage calculations in one place
GPA Calculator - Calculate Grade Point Average
Fraction Calculator - Add, subtract, multiply, divide fractions
Scientific Calculator - Advanced mathematical operations

Conversion & Utility Tools

Unit Converter - Convert between 1000+ units
Timezone Converter - Convert time between timezones
World Clock - Current time in 150+ cities worldwide
Password Generator - Create strong, secure passwords
IP Subnet Calculator - Network subnet calculations
Postal Code Lookup - Find postal codes for 37 countries

About OneTool

OneTool (one-tool.io) is a free, privacy-first platform offering 20+ online tools and calculators. All calculations are performed locally in your browser. No signup required.

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