FinanceAvailable
Mortgage Calculator
Estimate fixed-rate mortgage payments, total housing cost, and amortization for the United States and Canada.
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Free Online Calculators for Money, Tax & Everyday Life
Pro Calculator Lab offers free online calculators for mortgages, paychecks, income tax, car loans, savings, and more. The tools cover United States and Canadian scenarios where supported, show their inputs and methods clearly, and cite the sources behind their rules. Salary and income tax currently cover US federal rules only.
Calculators
Available Calculators
Only working calculators link to tool pages. Planned tools are shown as roadmap items so discovery stays honest.
Tax & IncomeAvailable
Salary / Take-Home Pay Calculator
Estimate 2026 United States federal take-home pay from salary, hourly, or per-pay income.
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Bra Size Calculator
Estimate a measurement-based starting bra size across common regional sizing labels.
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Auto Loan / Car Payment Calculator
Estimate monthly car payments, total interest, trade-in equity, taxes, and fees for US or Canadian vehicle financing.
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Compound Interest Calculator
Estimate future value, contributions, and interest earned from compound growth assumptions.
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Credit Card Payoff Calculator
Estimate payoff timelines and interest costs for credit card debt.
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Debt-to-Income Ratio Calculator
Estimate front-end and back-end DTI from gross income, housing costs, and recurring monthly debt payments.
Open calculatorTax & IncomeAvailable
Income Tax Calculator
Estimate 2026 United States federal income tax from ordinary income, deductions, credits, and withholding.
Open calculatorTax & IncomeAvailable
Sales Tax / GST-HST Calculator
Add or remove sales tax using a user-entered rate for US sales tax, reverse tax, reverse sales tax, and Canadian GST, HST, PST, QST, and combined tax estimates.
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Age Calculator
Calculate how old someone is from a date of birth, with exact age in years, months, days, total elapsed days, and next birthday timing.
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Loan Calculator
Estimate fixed-rate installment payments, total interest, withheld origination fees, and monthly amortization in USD.
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401(k) Retirement Calculator
Project 401k retirement savings with employee contributions, employer matching, investment returns, and fees.
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APR Calculator
Estimate fixed-rate installment loan APR with withheld or financed qualifying upfront finance charges.
Open calculatorCalculators by Category
Finance Calculators
Mortgage, car loan, savings, and debt calculators for big household decisions.
Tax & Income Calculators
Take-home pay, federal income tax, and sales tax tools for US and Canadian scenarios.
Health & Lifestyle Calculators
Measurement-based tools with clear instructions and caveats.
- Bra Size Calculator Live
Everyday Calculators
Quick everyday tools, starting with an exact age calculator.
- Age Calculator Live
How Our Calculators Work
Clear, Documented Methods
Every calculator explains its inputs, calculation method, and assumptions, and lists its limitations so you know what the result does and does not include.
Built for the US and Canada
Where rules differ by country, such as Canadian mortgage compounding, the calculator says which rules it uses. Salary and income tax cover US federal rules only; sales tax uses a rate you enter.
Sourced and Reviewed
Calculators cite relevant sources, including official IRS, Canada Revenue Agency, and CMHC guidance, and show the date they were last reviewed.
Works on Any Device
Forms, results and explanations are designed for phones, tablets and desktops.
Choose a Calculator
Pick a tool by category or search for what you need.
Enter Your Information
Use clear labels and inputs designed for quick completion.
Review Your Result
Read the output and any notes before making decisions.
Frequently Asked Questions
Are the Calculators Free to Use?
Yes. The calculators available on Pro Calculator Lab are free to use.
How Are Calculator Results Determined?
Each calculator uses documented formulas and, where applicable, official rules, such as IRS tax brackets or CMHC premium rates. Where a result depends on assumptions, the page explains them and lists any limitations.
Do Financial Calculators Provide Professional Advice?
No. Financial calculators are planning tools only. They do not replace advice from a qualified financial, tax, legal, or lending professional.
Do Calculators Support USA and Canada Rules?
Yes, where it matters. The mortgage, auto loan, and sales tax calculators support both countries; the salary and income tax calculators currently cover US federal rules only. Each page states which rules it uses. Sales tax rates and local tax treatment are user-entered.
Built for clarity
Confidence Behind Every Calculation
Practical calculators built around clear inputs, understandable results, and transparent limitations.
Practical Tools
Free calculators for everyday financial and personal decisions.
Browse calculatorsClear Methods
Helpful explanations and calculation assumptions where available.
Explore our approachHonest Scope
Relevant geographic limits and important result caveats are explained.
Read the disclaimerFeedback Welcome
Help us improve by reporting issues or suggesting enhancements.
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Latest Articles
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How to Calculate Reverse Sales Tax (Step-by-Step)
Find the price before tax by dividing the total by 1 plus the tax rate. See the reverse sales tax formula, US and GST/HST examples and mistakes to avoid.
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How Much Is CMHC Insurance? Premium Rates Explained
CMHC insurance typically costs 2.80% to 4.00% of your mortgage when you put down less than 20%. See the 2026 premium table, examples, PST rules and how to avoid it.
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How Does Compound Interest Work? Simple Examples
Compound interest means earning interest on your interest. See the formula, a $10,000 example over 30 years and why starting early pays off. Try it free.
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Mortgage & Home Buying8 min read
What Is a Good Debt-to-Income Ratio for a Mortgage?
See what DTI lenders want for conventional, FHA, VA and USDA loans, what counts as good or high, and how to lower yours before you apply. Check yours free.
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Tax & Paycheck10 min read
GST vs HST in Canada: What's the Difference? (2026)
GST is the 5% federal tax; HST combines it with provincial tax in five provinces. See 2026 rates by province, how each works and when home buyers pay it.
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Tax & Paycheck7 min read
Gross Pay vs Net Pay: What's the Difference?
Gross pay is what you earn; net pay is what you take home. See what is deducted, a $60,000 salary example and how to read your pay stub. Calculate yours.
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Mortgage & Home Buying8 min read
How Is a Mortgage Payment Calculated? Formula and Example
Learn the mortgage payment formula step by step, see a $320,000 example, how principal and interest change over time and the Canadian method. Try it free.
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Mortgage & Home Buying9 min read
How Much House Can I Afford? Salary Examples and the 28/36 Rule
See how much house you can afford on a $50,000 to $150,000 salary with the 28/36 rule, plus a Canada stress test example. Check your payment and DTI free.
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