Free Online Precision Calculators — ZYCalculator
Explore 20+ free online precision calculators for Personal Finance, Health, Date & Time, Chronology, and Everyday Math. Instant client-side execution with zero latency and complete privacy.
All Precision Tools
Exact Chronological Age & Birthday Engine
Calculate your exact age in years, months, days, and live milliseconds. View solar system planetary age, biological stats, and next birthday countdown.
Gold Jewellery Cost Estimator & Comparison Suite
Calculate real gold jewellery price with purity (18K, 22K, 24K), weight, making charges, 3% GST, and compare across top jewellers (Tanishq, Malabar, Kalyan).
City-to-City Time Difference & Meeting Overlap Planner
Compare exact time differences between world cities (London to NYC, NYC to LA, Delhi to London). Dual live clocks, timelines, and overlapping meeting hours.
Universal Unit Converter & Metric Matrix
Free universal unit converter online. Convert length (meters to feet), weight (kg to lbs), area (acres to sq ft), temperature (°C to °F), and speed instantly.
Fuel Cost & Road Trip Mileage Splitter
Calculate road trip fuel cost, gas needed in liters or gallons, vehicle mileage (km/L or MPG), and split travel expenses per passenger easily.
Discount, Sale Price & Margin Calculator
Calculate final sale prices, double stacked discounts, sales tax, money saved, profit margins, and cost markup percentages with instant formulas.
3-in-1 Precision Percentage Calculator
Calculate what is X% of Y, proportion ratios, percentage increase and decrease, discounts, margin markup, and tips with instant step-by-step formulas.
Daily Calorie & TDEE Maintenance Calculator
Free calorie calculator using Mifflin-St Jeor formula. Calculate your daily TDEE maintenance calories, BMR, weight loss deficits, and macronutrient targets.
Compound Interest & Monthly Deposit Calculator
Calculate compound interest with monthly deposits. Project future investment value, interest earned, compounding frequencies, and export yearly schedule CSV.
Gratuity & Retirement Benefit Calculator
Calculate gratuity in India under Payment of Gratuity Act 1972. Check 5-year eligibility, retirement benefits, and statutory ₹20 Lakh tax-free exemption.
Date Adder & Subtractor Calculator
Add or subtract days, weeks, months, years, or business workdays from any date. Calculate future deadlines, calendar intervals, and target project dates.
Side-by-Side Loan & Mortgage Comparison
Compare two loan or mortgage offers side-by-side. Evaluate monthly EMI differences, total interest payable, and net lifetime interest savings instantly.
Age Difference & Relationship Gap Calculator
Compare two birth dates to find exact age difference in years, months, days, and total days. Includes generational cohort matching and dating age rules.
Date Duration & Business Workdays Calculator
Calculate days between two dates, net working business days (excluding weekends), calendar weeks, elapsed hours, and date intervals with millisecond accuracy.
SIP & Investment Growth Calculator
Calculate mutual fund SIP returns, annual step-up compounding boost, lumpsum wealth growth, and inflation-adjusted maturity corpus with CSV schedule export.
EMI Loan & Amortization Calculator
Calculate loan EMI with amortization schedule. Compute monthly payments, total interest payable, and principal vs. interest for Home, Car, and Personal Loans.
PPF 15-Year Maturity & Compounding Calculator
Calculate PPF 15-year maturity amount, tax-free compound interest, 5-year block extensions, and download year-by-year sovereign compounding schedule as CSV.
GST & Sales Tax Invoice Calculator
Calculate Add GST (Exclusive) and Remove GST (Inclusive) with 5%, 12%, 18%, 28% slabs and complete 50/50 CGST & SGST tax invoice split breakdown.
WHO Body Mass Index (BMI) & Ideal Weight Calculator
Calculate Body Mass Index (BMI) with visual speedometer gauge. View WHO weight categories (Underweight, Normal, Overweight, Obese) and Devine Ideal Weight.
Pregnancy Due Date & Trimester Calculator
Calculate pregnancy due date by LMP, conception date, or IVF. Track gestational age in weeks & days, trimester progression, and fetal scan milestones.
World Clock & Global Timezone Converter
Convert time between world cities (EST to IST, London to NYC), compare UTC offsets, check Daylight Saving Time (DST), and schedule global meetings.