All calculators
Every tool on Chalk Calculator, grouped by what it is for. 30 calculators, all free, all running entirely in your browser.
Money
About this categoryWork out what a loan really costs, how savings compound, and what a long-term plan could be worth. Every projection shows the assumptions behind it.
- Loan PaymentMonthly payment, total interest and a full amortization schedule.
- Personal LoanPayment and true cost of a personal loan, including origination fees.
- Compound InterestGrowth of a balance with regular contributions and any compounding frequency.
- Investment GrowthProject a portfolio with contributions, fees and inflation applied.
- RetirementSavings at retirement, what it supports in income, and any shortfall.
- Roth IRARoth growth, contribution limit and whether your income phases you out.
- InflationWhat an amount is worth in another year, using official CPI data.
- ROIReturn on investment as a total percentage and an annualized rate.
Work & Pay
About this categoryTurn hours into pay and pay into take-home. Tax figures come from the published IRS tables for the year you select, and the assumptions are listed on every page.
- Time CardAdd up clock-in and clock-out times, subtract breaks, and get weekly hours and gross pay.
- PaycheckEstimate take-home pay after federal tax, Social Security, Medicare and deductions.
- SalaryConvert pay between hourly, weekly, biweekly, monthly and annual.
- OvertimeWork out overtime pay at time-and-a-half, double time, or a daily overtime rule.
- Annual IncomeTotal up income from several sources into one yearly figure.
From what you can afford to how much gravel fills the driveway. Material estimates state their density and waste assumptions so you can adjust them for your job.
- Home AffordabilitySee both the maximum price a lender may allow and the price that stays comfortable.
- Mortgage PayoffSee how much time and interest extra payments take off your mortgage.
- Mortgage PaymentMonthly principal, interest, taxes, insurance, HOA and PMI in one figure.
- RoofingRoof area, squares and shingle bundles from footprint and pitch.
- GravelCubic yards and tons of gravel for a driveway, path or pad.
- Square FootageArea of rectangles, circles, triangles and multi-room layouts.
- PaintGallons of paint for walls and ceilings, minus doors and windows.
- FlooringBoxes of flooring needed, including waste for cuts and pattern.
- ConcreteCubic yards of concrete for slabs, footings, columns and tubes.
What a car costs to buy, finance and run — including the comfortable-payment view, not just the maximum a lender would approve.
- Car AffordabilityThe car price that fits your budget, not just the loan you could get approved for.
- Car PaymentMonthly auto loan payment including trade-in, sales tax and fees.
- Lease vs BuyCompare the total cost of leasing against financing over the same period.
- EV ChargingCost per charge, per mile and per year, with charging losses included.
Everyday
About this categorySmall calculations you need in the moment, built to open fast and answer immediately on a phone.
- TipTip, total and an even split per person — with rounding options.
- PercentageEvery common percentage question in one place, including change and reverse.
- PacePace, time or distance for running, walking and cycling, with split times.
- Download TimeHow long a file takes at a given speed, with bits and bytes handled correctly.