Turn a simple roof footprint, pitch, waste allowance, and edge measurements into a practical asphalt-shingle material list: roof area, squares, bundles, underlayment, ridge cap, drip edge, and nails.

Flagship takeoff

Concrete Slab Calculator

Calculate cubic feet, cubic yards, ready-mix quantity, and bag counts for a rectangular concrete slab from length, width, thickness, and waste.

Flagship takeoff

Drywall Material Calculator

Estimate drywall sheets, finishable square footage, joint tape, joint compound, and screws for a rectangular room with optional ceiling coverage.

Flagship takeoff

Room Paint Calculator

Estimate wall-paint gallons from room dimensions, doors, windows, number of coats, and the coverage rating of the paint you plan to use.

Flagship takeoff

Flooring Material Calculator

Estimate flooring order square footage, boxes, and material cost from room dimensions, waste, box coverage, and price per box.

Flagship takeoff

Fence Material Calculator

Estimate posts, sections, rails, pickets, and concrete bags for a straight-run wood fence from length, spacing, gates, picket width, and post-hole dimensions.

Decision tools

Complex calculators for real decisions

These tools combine probabilities, hidden costs, time, risk or multiple pricing layers instead of stopping at one formula.

Selling

Reseller Buy Decision Calculator

Model a resale buy with sell-through probability, returns, sourcing mileage, time value, fees, shipping and target ROI — not just profit if everything goes right.

Home Improvement

Contractor Change Order Profit Impact Calculator

Price a change order after labor, materials, schedule delay, overhead, disruption, payment fees, commission and expected callback risk.

Business

Paid Ads Profit Ceiling Calculator

Work backward from unit economics and funnel conversion to maximum CPA, CPL, CPC, CPM and the ROAS floor that still leaves your target profit.

Money

Apartment Lease Offer Comparison Calculator

Compare two apartment offers using rent, concessions, recurring fees, parking, utilities, commute cost, move-in cash and the optional value of commute time.

Home Improvement

Concrete Bags vs Ready-Mix Cost Calculator

Compare bagged concrete with ready-mix after project volume, waste, bag price, mixing time, mixer rental, delivery, short-load fees and labor value.

CALCULATORTOOLSCALCULATE · DECIDE · ACT

181 free utilities

All calculators.

Browse every tool by topic. No signup, no app install, and calculator values stay in your browser.

Annual Fuel Cost Calculator

Estimate yearly gasoline expense from annual miles, vehicle MPG, and gas price.

Driving

Commute Cost Calculator

Estimate monthly and annual commuting fuel cost.

Driving

Cost Per Mile Calculator

Calculate your real vehicle cost per mile.

Driving

Deadhead Cost Calculator

Calculate the cost of unpaid driving miles.

Driving

Fuel Needed Calculator

Calculate how many gallons of gas a trip needs from distance and vehicle MPG.

Driving

Gas Cost Per Mile Calculator

Calculate fuel cost per mile from your vehicle MPG and current gas price.

Driving

Gig Break-Even Calculator

Find the gross earnings needed to cover vehicle costs.

Driving

Gig Driver Profit Calculator

Estimate true gig-driving profit and hourly earnings after vehicle costs.

Driving

MPG Savings Calculator

Compare fuel costs between two vehicles or MPG ratings.

Driving

Mileage Deduction Calculator

Estimate a mileage-based tax deduction using a user-entered rate.

Driving

Miles Per Dollar Calculator

Calculate how many miles you can drive per dollar of fuel from MPG and gas price.

Driving

Road Trip Gas Calculator

Estimate fuel gallons and cost for a road trip.

Driving

Trip Cost & Gas Cost Calculator

Calculate trip cost, gas cost, gallons needed, and driving fuel expense from trip distance, MPG, and gas price.

Driving

Trip Gas Cost Split Calculator

Split road-trip gas cost fairly between passengers using distance, MPG, gas price, and number of people.

Air Fryer Time Converter

Convert conventional oven directions into a practical air-fryer starting point.

Home & Everyday

Cooking Time Scaling Calculator

Scale cooking time when making a larger or smaller batch.

Home & Everyday

Days Between Dates Calculator

Calculate the number of calendar days between two dates.

Home & Everyday

Days Until Date Calculator

Calculate how many days remain until a future date from a date you choose.

Home & Everyday

Fahrenheit to Celsius Converter

Convert temperatures between Fahrenheit and Celsius instantly.

Home & Everyday

Recipe Scale Calculator

Scale recipe ingredient amounts up or down based on original and desired servings.

Home & Everyday

Square Footage Calculator

Calculate square feet for a rectangular room, floor, wall, or area from length and width.

Discount Calculator

Calculate sale price and savings from a percentage discount.

Money

Hourly to Salary Calculator

Convert an hourly wage into weekly, monthly, and annual gross pay.

Money

Markup vs Margin Calculator

Calculate both markup percentage and profit margin from cost and selling price.

Money

Pay Raise Calculator

See the hourly, monthly, and annual impact of a raise.

Money

Percentage Change Calculator

Calculate percentage increase or decrease between an old value and a new value.

Money

Profit Margin Calculator

Calculate profit margin from revenue and total cost.

Money

Rent Proration Calculator

Calculate prorated rent for a partial month.

Money

Salary to Hourly Calculator

Convert annual salary to an equivalent hourly, weekly, and monthly rate using hours worked per week.

Money

Sales Tax Calculator

Calculate sales tax amount and total price from a pre-tax price and tax rate.

Money

Tip & Bill Split Calculator

Calculate a tip and split the total bill.

Break-Even Sale Price Calculator

Find the minimum sale price needed to avoid a resale loss.

Resale

Marketplace Fee Calculator

Estimate selling fees from sale price and fee percentage.

Resale

Maximum Buy Price Calculator

Find the most you can pay for an item and still hit a target profit.

Resale

Resale Markup Calculator

Calculate markup percentage and dollar markup from item cost and selling price.

Resale

Reverse Selling Fee Calculator

Calculate the gross sale price needed to net a specific amount after percentage selling fees.

Resale

Seller Net Proceeds Calculator

Calculate seller net proceeds after marketplace fees, shipping, and other selling costs.

Resale

Seller Profit & Resale ROI Calculator

Calculate seller profit, resale ROI, marketplace fees, shipping costs, and net profit before buying or listing an item.

Resale

Target Profit Sale Price Calculator

Calculate the sale price needed to hit a target resale profit after purchase cost, fees, and shipping.

Break Deduction Calculator

Subtract unpaid breaks from a work shift.

Work & Time

Decimal Hours Converter

Convert hours and minutes to decimal hours.

Work & Time

Multiple Shift Calculator

Add two shifts, including overnight shifts.

Work & Time

Night Differential Pay Calculator

Calculate extra night-shift pay from hourly rate, differential amount or percentage, and eligible night hours.

Work & Time

Night Shift Calculator

Calculate hours for shifts that cross midnight.

Work & Time

Overtime Calculator

Calculate regular hours, overtime hours, and gross pay using a weekly overtime threshold.

Work & Time

Shift Hours Calculator

Calculate total paid hours between any two times, including overnight shifts and unpaid breaks.

Work & Time

Shift Pay Calculator

Calculate gross pay for one work shift from start time, end time, unpaid break, and hourly rate.

Work & Time

Time and a Half Calculator

Calculate a time-and-a-half overtime rate and pay from your normal hourly wage and overtime hours.

Work & Time

Weekly Gross Pay Calculator

Calculate weekly gross pay from hourly rate, regular hours, and overtime hours.

Work & Time

Weekly Hours Calculator

Add multiple workdays into one weekly total.

Home planning calculators

Home Planning & Build Decisions

11 scenario calculators for construction budgets, build-vs-buy decisions, remodeling, ADUs, financing, labor burden and project risk.

Planning decision

House Building Budget Calculator

Estimate how much house your construction budget can support, compare a target square footage against your entered cost-per-square-foot range, and see the budget gap.

Planning decision

Build vs Buy House Calculator

Compare the all-in near-term cost of building a house with buying an existing home using your own prices, temporary housing, closing costs, repairs and value estimates.

Planning decision

Remodel vs Move Calculator

Compare the incremental cash cost of remodeling your current home with selling, buying another home, moving and making immediate upgrades.

Planning decision

ADU Payback Calculator

Estimate an accessory dwelling unit’s annual operating income, simple yield, payback period and five-year net cash result from your own project and rent assumptions.

Planning decision

Basement Finishing Budget Calculator

Estimate a basement finishing budget from square footage, entered cost per square foot, bathroom, egress, permits and contingency.

Planning decision

Garage Conversion vs Addition Calculator

Compare the estimated cost per added living square foot of converting a garage versus building a new addition using your own cost assumptions.

Planning decision

DIY vs Contractor Calculator

Compare a contractor quote with DIY materials, tools, your time value and an expected redo-risk cost to see the risk-adjusted difference.

Planning decision

Construction Loan Interest Calculator

Estimate construction-loan interest from loan size, APR, term and a simplified staged-draw pattern, then include origination points and fixed financing fees.

Planning decision

Contractor Labor Burden Calculator

Calculate a loaded labor cost per productive hour from wage, payroll burden, workers comp, benefits and nonproductive paid time, then estimate a billable rate for a target gross margin.

Planning decision

Home Addition Value Gap Calculator

Compare a home addition’s project cost with your own before-and-after home value estimates to see cost per added square foot, estimated value added and recapture.

Planning decision

Renovation Overrun Buffer Calculator

Build a transparent renovation reserve from expected change orders, unknown-condition allowance, price escalation and schedule carry costs.

Formula reference

Need the equation without opening every calculator? See the consolidated formula reference for plain-English formulas and worked examples.

Break-even Point Calculator

Break-even units and revenue.

Business / Agent API

Marketing Metrics Calculator

CPC, CPM, CPA, CTR, conversion rate and ROAS.

Business / Agent API

Customer LTV:CAC Calculator

Lifetime value and acquisition economics.

Business / Agent API

Cash Runway Calculator

Burn rate and runway.

Business / Agent API

Freelance Hourly Rate Calculator

Target billable rate.

Electricity Cost Calculator

Appliance/device running cost.

Energy / Agent API

Broad utility front doors

New utility

Percentage Calculator

Calculate a percentage of a number, find what percent one number is of another, or calculate percentage increase and decrease.

New utility

Age Calculator

Calculate age in completed years, months and days plus total days between a birth date and an as-of date.

New utility

Time Calculator – Hours & Minutes Between Times

Calculate elapsed hours and minutes between two clock times, including overnight spans.

New utility

Grade Calculator – Weighted Course Grade

Calculate a weighted course grade from comma-separated assignment or category scores and weights.

New utility

Final Grade Calculator – What Score Do I Need?

Calculate the final-exam score needed to reach a target course grade and project an overall grade from an expected final score.

New utility

Concrete Calculator – Cubic Yards, Volume & Bags

Calculate concrete volume in cubic feet and cubic yards, add extra material, and estimate bag count using an editable bag yield.

New utility

Cubic Yard Calculator

Calculate cubic feet and cubic yards from length, width, depth and quantity.

New utility

Board Foot Calculator

Calculate lumber board feet from thickness, width, length and quantity.

NEW CALCULATORS // MATERIALS · DRIVING · PAY · BUSINESS

50 new focused calculators

Explore focused tools for concrete and material quantities, paint and drywall, driving costs, pay and rent, and business math. Each calculator keeps its formula and assumptions visible so you can adjust the inputs instead of relying on a black-box answer.

NEW CALCULATORS

Concrete & Sitework

New calculator

Concrete Footing Calculator

Calculate cubic yards of concrete for continuous or isolated rectangular footings, including quantity and waste.

New calculator

Concrete Column Calculator

Estimate cubic yards of concrete for round columns, piers or sonotube-style pours from diameter, height and quantity.

New calculator

Concrete Wall Calculator

Calculate concrete volume for poured walls from wall length, height, thickness, quantity and waste.

New calculator

Driveway Concrete Calculator

Estimate concrete cubic yards for a rectangular driveway or pad with editable thickness and waste.

New calculator

Concrete Waste & Overage Calculator

Add a transparent waste or overage allowance to a known concrete quantity and see the extra material required.

New calculator

Rebar Spacing Calculator

Estimate bar count and total linear feet for a rectangular slab or wall grid using an editable on-center spacing.

New calculator

Rebar Weight Calculator

Estimate total rebar weight from total linear feet, bar weight per foot and waste.

New calculator

Gravel Depth Calculator

Convert square footage and gravel depth into cubic yards and estimated tons using your own density assumption.

New calculator

Asphalt Tonnage Calculator

Estimate hot-mix asphalt tons from area, compacted thickness and density.

New calculator

Paver Base Calculator

Estimate cubic yards and tons of compacted base material for a paver patio, walkway or driveway.

NEW CALCULATORS

Drywall, Paint & Finish

New calculator

Drywall Cost Calculator

Estimate drywall sheet quantity and material cost from finishable square footage, sheet size, waste and sheet price.

New calculator

Drywall Screw Calculator

Estimate drywall screw count and box quantity from sheet count, screws per sheet and waste.

New calculator

Drywall Tape Calculator

Estimate joint tape length and roll count from drywall sheet count and an editable tape-per-sheet factor.

New calculator

Paint Coverage Calculator

Estimate gallons of paint from surface area, coats, coverage per gallon and waste.

New calculator

Paint Cost Calculator

Estimate paint material cost from area, coats, coverage, gallon price and supplies.

New calculator

Ceiling Paint Calculator

Calculate ceiling paint gallons from room dimensions, room count, coats and coverage.

New calculator

Trim Paint Calculator

Estimate paint needed for baseboards, casing or trim from linear feet, average face width, coats and coverage.

New calculator

Wall Square Footage Calculator

Calculate paintable wall area from room perimeter, height and door/window openings.

New calculator

Flooring Waste Calculator

Add a waste allowance to flooring square footage and convert the result into boxes using coverage per box.

New calculator

Tile Grout Calculator

Estimate grout bags and cost from tiled area, grout coverage per bag and waste.

NEW CALCULATORS

Driving & Fuel

New calculator

Weekly Gas Cost Calculator

Estimate weekly fuel gallons and gasoline cost from weekly miles, MPG and gas price.

New calculator

Monthly Gas Cost Calculator

Estimate monthly gasoline spend from miles driven, fuel economy and gas price.

New calculator

Idling Fuel Cost Calculator

Estimate fuel burned and money spent while a vehicle idles using your own gallons-per-hour assumption.

New calculator

Fuel Budget Distance Calculator

Estimate how many miles a fuel budget can support from fuel price and vehicle MPG.

New calculator

Road Trip Time Calculator

Estimate total road-trip time from distance, average moving speed and planned stop time.

New calculator

Mileage Reimbursement Calculator

Calculate mileage reimbursement plus optional tolls and parking from miles and reimbursement rate.

New calculator

Delivery Route Profit Calculator

Estimate route-level contribution after vehicle cost and paid driver time.

New calculator

Fleet Fuel Cost Calculator

Estimate fleet fuel gallons and cost from vehicle count, miles per vehicle, MPG and fuel price.

New calculator

Toll Cost Per Mile Calculator

Convert trip tolls into a per-mile cost and combine them with fuel cost per mile if desired.

New calculator

Vehicle Depreciation Per Mile Calculator

Estimate straight-line depreciation cost per mile from purchase price, expected resale value and miles driven during ownership.

NEW CALCULATORS

Work, Pay & Rent

New calculator

Biweekly Pay Calculator

Estimate two-week gross pay from hourly rate, weekly regular hours, weekly overtime hours and overtime multiplier.

New calculator

Monthly Pay Calculator

Convert hourly pay and weekly hours into average monthly and annual gross pay.

New calculator

Double Time Pay Calculator

Calculate double-time pay for a block of hours and compare it with straight-time pay.

New calculator

Holiday Pay Calculator

Estimate holiday-shift pay using separate paid-holiday hours and worked-holiday premium assumptions.

New calculator

Commission Pay Calculator

Calculate base pay, commission and total gross pay from sales and commission percentage.

New calculator

Piece Rate Pay Calculator

Calculate gross piece-rate earnings from units completed and pay per unit, with optional hourly add-on pay.

New calculator

Per Diem Calculator

Estimate total per diem allowance and remaining amount after out-of-pocket covered expenses.

New calculator

Rent Increase Calculator

Calculate a rent increase by percentage or compare a proposed new rent with current rent.

New calculator

Lease Break Cost Calculator

Estimate the cash exposure of breaking a lease using remaining rent, lease-break fee, concessions, notice rent and expected deposit return.

New calculator

Move-In Cost Calculator

Add first-month rent, prorated rent, deposit, fees, moving costs and utility deposits, then subtract credits.

NEW CALCULATORS

Business & Utility

New calculator