Calculators
Fast financial, date, health, tax, and everyday calculators. 100% free, browser-based execution with no server uploads, no watermarks, and instant results.
Available Calculators (26)
Select any tool below to start immediately without signup or downloads.
YouTube Revenue Calculator
Estimate YouTube video and channel AdSense earnings, RPM by niche, and brand deals.
Crypto Profit Calculator
Calculate crypto trading profit/loss, ROI %, exchange fees, and DCA accumulation.
Freelance Rate Calculator
Calculate required hourly and day rates from target take-home salary and overhead.
Loan / EMI Calculator
Estimate monthly loan payments and total interest.
GST / VAT Calculator
Add or remove tax and see net, tax, and gross amounts.
Currency Converter
Convert between currencies using current or cached rates.
Percentage Calculator
Calculate percentages, changes, and ratios.
Age Calculator
Calculate exact age and upcoming birthday details.
BMI Calculator
Calculate BMI using metric or imperial units.
Tip Calculator
Calculate tips, totals, and split bills.
Compound Interest & Investment Calculator
Calculate investment compounding returns with monthly contributions and interactive visual growth chart.
Date Difference & Working Days Calculator
Calculate exact days, weeks, months, and business working days between two calendar dates.
Discount & Sales Tax Calculator
Calculate final checkout price, discount savings, and applied sales tax instantly.
Payment Processing Fee Calculator
Calculate transaction fees for Stripe, PayPal, Square, and Shopify, or use the reverse invoice estimator.
Profit Margin & Markup Calculator
Calculate gross profit, margin percentage, markup rate, and required selling price from cost.
Startup Runway & Cash Burn Calculator
Calculate remaining months of cash runway, net burn rate, zero cash date, and required growth rates.
Free In-Browser Printable Invoice Generator
Generate professional printable PDF invoices with line items, tax, discounts, currency selector, and custom logos. No signups or watermarks.
Aspect Ratio & Resolution Calculator
Calculate dimensions, simplify ratios via GCD, scale image/video sizes, and preview standard 16:9, 4:3, 9:16, and 21:9 formats.
Hourly to Salary & Paycheck Calculator
Convert hourly wage to annual salary, monthly take-home, bi-weekly, and weekly paychecks with overtime and PTO adjustments.
Sales Tax & Reverse Tax Calculator
Calculate sales tax, total price with tax, or compute reverse sales tax to extract pre-tax subtotal from gross receipt amounts.
Grade & Final Exam GPA Calculator
Calculate weighted coursework grades and determine the exact score needed on your final exam to achieve your target class grade.
Square Footage & Flooring Calculator
Calculate total square footage, square meters, waste factor allowances, and estimated material costs across one or multiple rooms.
Time Duration & Work Hours Calculator
Calculate elapsed hours and minutes between two times, deduct lunch breaks, and convert to decimal hours for timesheet payroll.
Fuel Cost & Road Trip Gas Calculator
Estimate fuel consumption and trip expenses based on mileage, MPG or L/100km, gas prices, and passenger cost splits.
Retirement & 401(k) Nest Egg Calculator
Simulate compound investment growth across your career, factor in inflation, and compute monthly safe retirement income via the 4% rule.
Credit Card Validator & Luhn Algorithm Checker
Verify card number checksums using the standard ISO/IEC 7812 Luhn formula (Mod 10) and identify card networks with complete client-side confidentiality.
Practical Guides & Tutorials for Calculators
Understanding Loan EMI Calculations: Formulas, Amortization & Tips
A complete guide to calculating loan EMIs, understanding amortization schedules, and minimizing total interest paid on mortgages, auto loans, and personal credit.
Read tutorial →5 min readSubnet & CIDR IP Calculator: Host Ranges, Subnet Masks & Wildcards
A networking guide to Classless Inter-Domain Routing (CIDR) and IP subnetting. Calculate usable host ranges, binary subnet masks, and broadcast IPs.
Read tutorial →5 min readCar Loan EMI Calculation: Interest Rates, Tenures & Down Payments
A complete guide to calculating car loan EMIs. Compare financing terms, down payment impacts, and total interest on new vs used car purchases.
Read tutorial →3 min readReverse GST Calculator Formula: How to Extract Tax from Total Price
Learn the mathematical formula to back-calculate original prices from tax-inclusive totals. Free reverse GST and VAT calculator.
Read tutorial →Frequently Asked Questions About Calculators
How accurate are the financial calculations?
All calculations follow standardized banking formulas (such as standard reducing balance loan amortization) with full double-precision floating math.
Can I save or share my calculation results?
Yes! Click the 'Share Calculation' button on any calculator to generate a direct link that preserves your exact inputs.