Calculator Tools
10 toolsFree online calculators for percentages, dates, unit conversions, and mathematical operations. Fast results with no signup required.
Percentage Calculator
Calculate percentages three ways: X% of Y, what percent X is of Y, and percentage change between two values. Instant results as you type — local.
Date Calculator
Calculate days between two dates or add and subtract days, with results broken into years, months, weeks, and days — leap-year aware, local.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly in both directions. Real-time results as you type — runs entirely local.
Credit Card Validator
Validate card numbers with the Luhn checksum and identify the network — Visa, Mastercard, Amex — from IIN/BIN prefixes. All checks run locally.
Timezone Converter & Meeting Planner
Compare times across 400+ IANA zones on a visual hour grid with working-hours overlap detection and calendar export — fully client-side processing.
Professional IBAN Validator
Validate IBAN and BIC/SWIFT codes for 70+ countries. Modulo 97 checksum verification, format audit, and BBAN extraction. 100% private and local.
Loan Payoff Architect
Plan your payoff with an advanced mortgage and loan calculator: full amortization schedules, overpayment simulations, PMI/tax estimation, bi-weekly logic.
SWIFT/BIC Code Checker
Validate and decode SWIFT/BIC codes with color-coded bank, country, location, and branch segments, flag display, and test-BIC detection — local.
Math Expression Evaluator
Evaluate complex math expressions with variables, built-in functions, unit conversions, and base number support via a custom recursive descent parser.
Unit Converter
Convert 200+ units across 10 categories — length, weight, temperature, area, volume, speed, data, time, pressure, and energy — works offline.