Calculators

Calculate percentages instantly with 3 modes: find X% of Y, find what percent X is of Y, or calculate percentage change between two values. Real-time results, quick presets for discounts, tips, and taxes. Free online percentage calculator — no signup required.

Calculate your exact age in years, months, days, weeks, and hours. Get your zodiac sign, Chinese zodiac, Korean age, generation, next birthday countdown, and day-count milestones. Free and instant.

Calculate monthly loan payments, total interest, and amortization schedules for any loan amount and term. Compare mortgage, car, and personal loan offers side by side instantly.

Calculate your Body Mass Index (BMI) instantly using metric (kg/cm) or imperial (lbs/ft) units. See your BMI category with a visual gauge, healthy weight range, and bilingual explanations. Free, no signup needed.

Calculate tip amount, total bill, and per-person split instantly. Choose from preset tip percentages (10%–25%) with quality labels, use the 0–30% slider, split among 1–20 people, and toggle round-up. Includes tipping guides by country and service type.

Convert between 50+ units across 8 categories: length, weight, temperature, volume, area, speed, time, and data storage. Instant real-time results with swap and copy.

Free compound interest calculator with monthly contributions, growth chart, and scenario presets. See how your investments grow over time — start planning now.

Check WCAG 2.1 color contrast ratio between foreground and background colors instantly. See AA and AAA pass or fail badges for normal text, large text, and UI components. Live text preview at multiple sizes, color picker with hex input, swap colors, and copy results. Free online accessibility checker — no signup required.

Calculate gold prices in Vietnam. Convert grams to taels, get SJC and Ring 9999 buy/sell prices. Supports 24K, 18K, 14K gold with unit conversion. Free online gold price calculator.

Calculate stock profit and loss for Vietnamese stocks. Includes 0.15% brokerage fee + 0.1% selling tax. See net P&L, ROI%, break-even price in VND. Free stock profit calculator.

Calculate cryptocurrency profit and loss with DCA (Dollar Cost Averaging) strategy. Simulate Bitcoin investment returns over time. Compare lump-sum vs DCA, factor in exchange fees and taxes. Free crypto calculator.

Estimate your monthly fuel costs in Vietnam. Enter daily km and fuel consumption to see daily, weekly, and monthly expenses with RON95, E5 RON92, and Diesel prices. Free fuel cost calculator with vehicle presets.

Convert between 12 currencies instantly: USD, VND, EUR, GBP, JPY, CNY and more. Compare bank rates, swap currencies in one click. Free exchange rate calculator.