Numbers you can trust, before you commit.
CalcuOnline is a set of precise instruments — for loan math, tax calculations, savings projections, live currency conversion, material estimates, health reference numbers, everyday developer utilities, paragraph rewriting, PDF/file tools, and student essentials like CGPA conversion and attendance tracking. Every calculation stays on your device.
The professional, premium calculator suite used by professionals across the US, Canada, Europe, Africa, Asia, Australia & India
PDF & File Tools
Compress, convert, merge, and split PDFs and images — entirely in your browser, zero uploads.
Browse all Files tools →Compress PDF
Shrink PDF file size for email attachments and exam-portal uploads, entirely in your browser.
Merge PDF
Combine multiple PDF files into one document, in the order you choose.
Split PDF
Pull out specific pages or page ranges from a PDF into a new file.
Image to PDF
Convert JPG and PNG photos into a single clean PDF, in your chosen order.
PDF to JPG
Export every page of a PDF as a high-quality JPG image.
Compress Image
Shrink a photo under a target file size for exam forms, passport photos, and signatures.
Watermark PDF
Stamp a text watermark across every page of a PDF.
HTML to PDF
Paste or upload HTML and convert it to a downloadable PDF, client-side.
Finance & Business
Loans, tax, savings, and pricing tools for money decisions.
Browse all Finance tools →Loan EMI Calculator
Monthly payment, total interest, and a full payoff schedule.
Loan Comparison
Compare monthly payment and total interest across two loan offers at once.
Sales Tax Calculator
Add tax on top of a price, or back it out from a total.
Compound Interest Calculator
Project savings growth with recurring contributions.
Tip & Bill Split
Split a bill and tip evenly across any group size.
Percentage & Ratio Calculator
Percent of a number, percentage change, ratio simplification, and proportions.
Currency Converter
Convert between 40+ currencies using live exchange rates.
SIP Calculator
Project SIP returns with optional annual step-up.
SWP Calculator
See how long a corpus lasts under regular withdrawals.
Lumpsum Calculator
Future value of a one-time investment, year by year.
SIP vs Lumpsum
Invest the same total amount two ways and compare the final value.
CAGR Calculator
Annualized growth rate between any two portfolio values.
Stock Average Calculator
Blended buy price across lots, plus shares to hit a target average.
Wealth Goal Planner
How much to invest monthly, and in what mix of assets, to hit a wealth target on time.
Simple Interest Calculator
Interest and payoff total with no compounding, year by year.
Discount & Markup Calculator
Sale price from a discount, or sell price from a cost and markup.
Income Tax Calculator
Compare tax under the new and old regimes across every income group, with slab-wise breakdown.
Net Salary (CTC) Calculator
Break down CTC into Basic, HRA, PF, and gratuity to see your actual monthly take-home.
Retirement & Investment
Retirement accounts, portfolio growth, and investment tax tools.
Browse all Investing tools →401(k) Contribution Calculator
Project your 401(k) balance with employer match, contribution limits, and annual growth.
Roth IRA Conversion Calculator
Estimate the tax bill on converting a traditional IRA to a Roth IRA.
Dividend Growth Calculator
Project dividend income growth with reinvestment (DRIP) over time.
Structured Settlement Calculator
Present value of future structured settlement payments at a given discount rate.
Stock Option Pricing Calculator
Estimate call and put option value using the Black-Scholes model.
Crypto Capital Gains Calculator
Short-term vs long-term capital gains tax on cryptocurrency trades.
Accredited Investor Calculator
Check net worth and income against SEC accredited investor thresholds.
Expense Ratio Calculator
See how much an expense ratio costs you in fees over the life of an investment.
Business & Enterprise
SaaS metrics, commercial lending, and enterprise cost tools.
Browse all Business tools →Business Loan Amortization
Monthly payment, total interest, and a full amortization schedule for a business loan.
SaaS LTV Calculator
Customer lifetime value from ARPU, gross margin, and churn rate.
Merchant Processing Fee Calculator
True cost of card processing fees, and the payout after fees are deducted.
Payroll Tax Calculator
Employer-side payroll tax burden per employee — FICA, FUTA, and SUTA.
Cap Rate Calculator
Capitalization rate and valuation from net operating income.
Lease vs Buy Calculator
Compare the total cost of leasing equipment against financing a purchase.
Freight Class Calculator
Estimate NMFC freight class from shipment weight and dimensions.
Software ROI Calculator
Payback period and return on investment for a new software purchase.
GST Invoice Generator
Build a GST tax invoice with line items and HSN/SAC codes — CGST/SGST or IGST split automatically.
Salary Slip Generator
Turn a CTC figure into a monthly payslip — Basic, HRA, PF, professional tax, and TDS.
Receipt Maker
Fill in payer, amount, and payment mode — get a clean receipt with the amount spelled out.
QR Code Generator
Turn a link, UPI ID, Wi-Fi network, or WhatsApp number into a scannable QR code.
Resume Builder
Build a clean, ATS-friendly resume with a live preview and PDF download.
Legal Document Generator
Generate a rental agreement or NDA from a simple form, with PDF export.
Mortgage & Real Estate
Home loans, refinancing, and rental property finance tools.
Browse all Mortgage tools →HELOC Payment Calculator
Interest-only draw period payments and full repayment-period amortization for a HELOC.
Reverse Mortgage Calculator
Estimate available reverse mortgage proceeds from home equity and age.
FHA Loan Calculator
Monthly payment including FHA upfront and annual mortgage insurance premiums.
Jumbo Loan Calculator
Monthly payment and total interest for a non-conforming jumbo mortgage.
Refinance Closing Costs Calculator
Break-even point on refinance closing costs versus monthly payment savings.
Rental Cash Flow Calculator
Monthly cash flow and cap rate from rent, expenses, and mortgage payment.
DTI Ratio Calculator
Front-end and back-end debt-to-income ratio for mortgage qualification.
Insurance & Risk
Coverage needs, premiums, and risk-planning calculators.
Browse all Insurance tools →HSA Contribution Calculator
Annual HSA contribution limits, tax savings, and year-end balance projection.
Term Life Insurance Calculator
Estimate how much term life coverage your family would need.
Commercial Auto Insurance Estimator
Rough premium estimate for a commercial vehicle fleet by risk factors.
Workers' Comp Calculator
Estimate workers' compensation settlement value from wage and injury factors.
LTD Benefit Calculator
Estimate the monthly benefit a long-term disability policy would pay out.
Real Estate & Civil
Material, area, and cost estimators for building and land.
Browse all Civil tools →Concrete Volume Estimator
Cement bags, sand, and aggregate for slabs and footings.
Land Area Converter
Acres, hectares, sq ft, sq m, cents, bigha, and guntha.
Brick & Masonry Estimator
Material counts for a wall, minus doors and windows.
Paint Estimator
Liters, containers, and cost for walls and ceilings.
Flooring & Tile Calculator
Tiles, boxes, and cost for any room and tile size.
Roofing Estimator
Sloped roof area, shingle bundles, and underlayment by pitch.
Developer & Tech
Everyday parsing, formatting, and encoding utilities.
Browse all Dev tools →JSON Formatter
Clean, validate, and explore JSON in an interactive tree.
Base64 / JWT Decoder
Encode, decode, and inspect tokens in the browser.
Regex Tester
Test patterns against sample text with live highlights.
Color & Contrast Checker
Convert HEX/RGB/HSL and check accessible contrast.
Timestamp Converter
Convert between Unix time, ISO 8601, and local dates.
Hash Generator
MD5, SHA-1, SHA-256, and HMAC-SHA256 from text, entirely in your browser.
UUID Generator
Bulk-generate UUIDs or random strings with a custom charset.
HTML Editor
Write HTML/CSS and see a live sandboxed preview, right in your browser.
Health & Medical
Reference calculators for common clinical and wellness numbers.
Browse all Medical tools →eGFR Calculator
Estimate kidney function from serum creatinine using the race-free CKD-EPI 2021 equation.
BMI Calculator
Body mass index, weight category, and a healthy weight range for your height.
BMR & Calorie Calculator
Resting metabolic rate and daily calorie needs by activity level.
Pregnancy Due Date Calculator
Estimated due date and current gestational age from your last period or conception date.
Body Fat Calculator
Estimate body fat percentage from height, neck, waist, and hip.
MAP Calculator
Calculate mean arterial pressure from systolic and diastolic blood pressure.
Creatinine Clearance
Estimate creatinine clearance for renal drug dosing.
CHA₂DS₂-VASc Score
Estimate stroke risk in atrial fibrillation from clinical risk factors.
BSA Calculator
Calculate body surface area from height and weight.
Corrected Calcium
Correct total serum calcium for low albumin using the Payne formula.
FIB-4 Index
Screen for advanced liver fibrosis from age and routine labs.
QTc Calculator
Calculate corrected QT interval using Bazett, Fridericia, and other formulas.
Nutrition Lookup
Search any food for its full nutrient breakdown and compare several side by side.
ASCVD Risk Calculator
10-year atherosclerotic cardiovascular disease risk (Pooled Cohort Equations).
Text & Writing
Rewrite, restructure, and clean up writing right in your browser.
Browse all Text tools →Student Tools
CGPA conversion, attendance tracking, and exam-planning tools for Indian students.
Browse all Students tools →CGPA to Percentage
Convert CGPA or SGPA to percentage using your university’s formula.
Attendance Calculator
See how many classes you can safely skip and still hit the required attendance.
Age Calculator
Find your exact age, total days lived, and days until your next birthday.
JEE/NEET Rank Predictor
Estimate your percentile and All India Rank range from your expected marks.
Not just calculators — tutorials and reviews too
Two independent tracks under one roof: hands-on tutorials for builders, and honest product reviews for buyers. Both tested and researched, neither sponsored.
Step-by-step, code-first walkthroughs
Ambient AI medical scribes, LLM fine-tuning, RAG pipelines, trading bots, JWT auth, OWASP audits, and CI/CD — full working code, not just theory.
Browse tech tutorials →Honest verdicts, not marketing copy
Credit cards, home & vehicle loans, health & term insurance, mutual funds, pension plans, and B2B/SaaS tools — researched against real issuer and provider disclosures.
Browse all reviews →Every calculation runs locally in your browser. Nothing you type is sent to any server.
All tools compute in real time as you type — no button to click, no page reload.
Finance tools export to PDF and CSV, so results go straight into your reports.
Planning a wedding or event next?
Digital wedding invitations, RSVP tracking & guest management
eInvit is our digital invitation platform for Indian weddings and events — RSVP tracking, guest management, gift registries, and themed invitations for Hindu, Christian, Muslim, and corporate celebrations. Free to start, live in minutes.