Free calculator widgets for your website

Turn slab or round-column dimensions into cubic yards, cubic metres, and 40, 60, and 80 lb bag counts, with waste and cost included.

Measure a room or area in feet and inches and get square feet, square yards, square metres, a waste-adjusted total, and the number of boxes to buy.

Turn slab, footing, column, gravel, or topsoil dimensions into cubic yards, bags, tons, and an estimated material cost.

Apply markup to material cost and see the customer price, gross profit dollars, and the resulting gross margin.

Build a job price from labor, materials and other costs plus contingency, overhead and a target profit margin.

Turn a base wage into a bill rate: add labor burden, apply markup, and see the real margin per hour.

Add payroll tax, workers comp, benefits, and other burden to a wage to get your true hourly labor cost.

Paintable wall area, gallons to buy and cost for a room.

Gravel, crushed stone or road base in cubic yards, tons and cost.

Gross profit and margin from revenue and cost, plus the price needed to hit a target margin.

Convert markup to margin or the reverse, with the resulting price and profit on any cost.

Gross and net profit on a job, margin vs markup, break-even price, and the price needed to hit a target margin.

Turn fixed monthly costs and gross margin into the revenue you must book each month — and each day — to break even.

Turn beginning inventory, deliveries, and ending inventory into total feed used, feed per day, and lb per animal per day.

Take feed price per ton and total feed used and get total cost, cost per head, and cost per head per day.

Hay needed, bales to buy, cost per pound and ton, and cost per animal per day — with feeding waste included.

The home price, loan and monthly housing payment your gross salary supports under adjustable 28/36 ratios.

Year-by-year cost and equity for both paths, the break-even year, and the single assumption deciding the verdict.

Cash spent and equity built under a rent-to-own agreement versus buying the same home now, over the same period.

Screen a rental in one pass: mortgage payment, operating expenses, cash flow, cap rate, and cash-on-cash return.

What is X% of Y, X is what percent of Y, and percentage increase or decrease between two numbers.

Percent increase or decrease from an old value to a new one, with zero-start and negative-value handling.

Symmetric percent difference between two values, shown next to percent change in both directions.

Needs, wants, and savings dollar targets from take-home pay, using a standard split or your own percentages.

Which of two or three products is the better deal, once price and package size are normalized to the same unit.

Sale price and savings from one or two discounts, with optional sales tax on the discounted price.

Add sales tax to a subtotal, or reverse it out of a total that already includes tax.

Tip amount, bill total, and the split per person — with an option to tip pre-tax.

Turn any fraction into a percent and decimal, with the simplified fraction.

Add or subtract a percentage from any number, with the amount and the reverse.

What a vehicle really costs over the years you keep it — depreciation, interest, fuel, insurance and upkeep — per month, year and mile.

Solves backwards from income, debts and running costs to the vehicle price you can carry — plus a stretch limit, scenarios, and the constraint driving it.

Break a machine into ownership, fuel, and maintenance cost per hour so you can price work and compare renting.

Lifetime cost of a machine — depreciation, financing, fuel, upkeep, insurance and storage — as a total, per year and per operating hour.

Annual cost to own versus rent a machine, and the break-even days of use.

Full monthly housing payment including tax, insurance, HOA and PMI — plus an affordability mode that solves backwards to a home-price range and stretch limit.

Monthly payment, total interest, and payoff time for any amortized loan — with an optional extra payment.

Car payment from price, trade-in, tax, and fees — with the financed amount and total interest shown separately.

Build a full amortization schedule for any fixed-rate loan — payment, total interest, payoff date, and the principal/interest split every year or month.

Amortize any balance month by month to get the payoff date, total interest, and the effect of paying extra.

Payoff date, interest saved and side-by-side extra-payment scenarios — plus the reverse solve for a target debt-free date.

Solve a card balance either way — payment to payoff time, or target months to the required payment.

See what rolling an upside-down trade-in into a new car loan really adds to the payment, the interest and the loan-to-value.

Front-end and back-end DTI from income, housing and monthly debt payments.

Simple interest, total amount and yearly interest from principal, rate and time.

Compare your current car loan to a refinance: payment, interest, fees and break-even.

Estimated net pay per week, fortnight, month and year — with raise and contribution scenarios and a reverse solve for the salary a target take-home needs.

Turn an annual salary into an hourly rate, adjusted for the hours you actually work and your paid leave.

Annual, monthly, biweekly, and weekly pay from an hourly rate, including regular overtime.

See exactly what gets withheld from one paycheck — federal, state, FICA, and extra withholding — and what lands in your account.

Work out your raise percentage, new pay, and how much extra you'll actually see per paycheck.

Split a pay period into regular, overtime, and double-time pay, then see total gross pay and the blended effective hourly rate.

Turn clock-in and clock-out times into paid hours, an overtime split, and gross pay for the week.

Add a night, weekend, or hazard shift differential to hourly pay and get the correctly blended overtime rate.

Reimbursement owed from business miles and a cents-per-mile rate, plus tolls and parking.

Hourly rate to gross pay per weekly, biweekly, semi-monthly and monthly paycheck.

Commission earned and total pay from sales, rate, base pay and quota.

Ending balance, total contributions, and interest earned for any rate, term, and compounding frequency.

Project a savings balance from deposits, or solve for the monthly amount needed to hit a goal.

Net gain, ROI percentage, and annualized return for any investment or business spend.

Exact age in years, months and days from a birth date, plus total days and the next birthday.

Days, weeks, months, and years between two dates — including a business-day count.