Free Online Calculator Tools

Freelance Rate Calculator

Convert hourly rate to daily, weekly, monthly, and annual equivalents — or reverse from annual target.

Crypto Price Converter

Convert cryptocurrency amounts to fiat currencies using live prices from CoinGecko's free API.

Loan / EMI Calculator

Calculate monthly EMI and view a full amortization schedule for any loan.

Tip Calculator

Calculate tip amount, total bill, and per-person split with preset or custom tip percentages.

Discount / Sale Price Calculator

Find the sale price from a discount %, or find the discount % from original and final prices.

Compound Interest Calculator

Calculate compound interest with any compounding frequency and see year-by-year growth.

GPA Calculator

Calculate weighted GPA from courses with grades and credit hours — supports 4.0 and percentage scales.

Grade / Percentage to Letter Grade Converter

Convert a percentage score to a letter grade with a fully configurable grading scale.

Pregnancy Due Date Calculator

Estimate your due date using Naegele's rule from your last menstrual period date.