CalcKit
All-in-One Calculator
33 calculators in one fast, private app.
The money, health, school and everyday math you actually run — mortgage payments, take-home pay, sales tax, BMI, macros, GPA — without the ads-first clutter or the spreadsheet. Every calculator knows whether you are in the US or Canada, and every one of them works offline.
- Calculators
- 33
- Countries
- US / CA
- Languages
- 7
Built for the US and Canada
Most calculators quietly assume you are American. CalcKit asks once, then gets the details right everywhere they matter.
Take-home pay
Federal plus state or provincial brackets, not a flat estimate.
Sales tax
Knows GST, HST and PST — not one blended national rate.
Retirement savings
Modeled as 401(k)/IRA or as RRSP/TFSA.
Closing costs
Land transfer tax included where it applies.
Mortgage rules
Regional lending rules applied to the payment.
Units
Imperial or metric, defaulted to match your region.
Designed to be fast
Enter your numbers, see the answer instantly, and get the reasoning right underneath it.
US and Canada, done properly
Set your country once. Tax brackets, GST/HST/PST, 401(k)/IRA vs RRSP/TFSA, land transfer tax and imperial vs metric units all follow.
Charts and full tables
Every answer comes with the supporting detail underneath — growth curves, cost breakdowns, and complete amortization schedules.
What-If comparison
Run the same calculator twice side by side. 10% down or 20%? 5.5% or 6.2%? See the difference instead of guessing at it.
Favorites and history
Pin the calculators you use weekly to the top. Every calculation is saved automatically and ready to reopen.
Save, share and export
Label a calculation and keep it, share the result, or export it as a PDF to send to a lender, client or study group.
Offline and account-free
No sign-up, no server, no network calls. Your salary, mortgage and health numbers never leave your device.
A look inside
Scroll for more screens →
All 33 calculators
Grouped the way the app groups them. Anything marked US / CA changes its rules when you switch country.
Finance & Tax15
The money math you actually run — payments, paycheques, and long-term growth.
Mortgage Payment
US / CAMonthly payment with taxes and insurance
Take-Home Pay
US / CANet salary after federal and state/provincial taxes
Sales Tax
US / CATax for any US state or Canadian province
Loan Payoff
How fast extra payments clear the balance
Compound Interest
See how your money grows over time
Retirement Savings
US / CAProject savings with 401(k)/RRSP contributions
Savings Goal
How long until you reach your target
Rent vs Buy
US / CACompare total costs of renting and owning
Currency Converter
Convert between USD, CAD and 30+ currencies
Tip Calculator
Tip and split the bill with friends
Profit Margin
Gross and net margins for your business
ROI
Return on investment, plain and annualized
CAGR
Compound annual growth rate over a holding period
APR
True annual rate including fees and points
Commission
Commission earned on any sale
Real Estate5
Underwrite a deal before you make the offer.
Cap Rate
Capitalization rate for investment properties
Cash-on-Cash Return
Return on the cash you actually put in
Rental Yield
Gross and net yield on a rental
Closing Costs
US / CAEstimate by state or province, land transfer tax included
Amortization Schedule
Full payment breakdown, month by month
Health & Fitness5
Body numbers without a sign-up wall or a subscription.
BMI Calculator
US / CABody Mass Index in imperial or metric
TDEE / Calories
Total daily energy expenditure and calorie needs
Macro Calculator
Your protein, carb and fat split
Body Fat %
Estimate using the US Navy method
Water Intake
How much water to drink daily
Student3
Grades and tuition debt, answered in seconds.
GPA Calculator
Cumulative GPA on a 4.0 scale
Final Exam Grade
The score you need to hit your target grade
Student Loan
Monthly payment and total interest
Everyday5
The small ones you reach for at the checkout.
Percentage Calculator
What is X% of Y, plus increase and decrease
Discount Calculator
Sale price and what you saved
Unit Converter
Metric and imperial, both directions
Unit Price
Compare two products by price per unit
Age Calculator
Exact age in years, months and days
Private by design
CalcKit works entirely offline. There is no account, no sign-up and no server — your salary, your mortgage and your health numbers stay on your device and are never uploaded anywhere.
Read the privacy policy7 languages
The whole app — every calculator, label and result — follows your system language.
- English
- Español
- Français
- 简体中文
- 繁體中文
- 日本語
- 한국어
CalcKit Pro
Every calculator is free, forever. Pro is a single one-time purchase — no subscription.
| Feature | Free | Pro · $3.99 once |
|---|---|---|
| All 33 calculators | Included | Included |
| Calculation history | 20 entries | 100 entries |
| Saved calculations | 5 | Unlimited |
| Banner ads | Shown | Removed |
Note: the currency converter uses built-in offline reference rates for eight major currencies and is intended for quick estimates, not for trading or settlement.
Want a calculator we don't have yet?
CalcKit is actively developed and the list keeps growing. Tell us what you need and it may end up in the next release.
Get in touch