FAST ANSWERS FOR REAL LIFECalculate anything.
Calculate anything.
Figure it out faster.
155+ free calculators and practical tools for home projects, energy, vehicles, travel, moving, events and more. Instant results. No signup required.
⚡Instant ResultsNo signup or email required
◆Trusted FormulasTransparent, editable assumptions
♥Built for Real LifeFrom DIY projects to events
Browse by task
See all 140 →Start with what you're trying to figure out
Home Improvement37 calculatorsPlan materials before the hardware-store run: paint, flooring, concrete, roofing, trim, framing and more.
Energy & Appliances30 calculatorsEstimate electricity use, charging time, equipment size, operating cost and energy savings.
Vehicle & Travel30 calculatorsCompare fuel and charging costs, tire sizes, mileage, road-trip costs and vehicle ownership estimates.
Moving & Home Setup15 calculatorsSize rooms, moving supplies, storage, TVs, projectors, speakers, curtains and other setup decisions.
Events & Food23 calculatorsEstimate drinks, food, ice, coffee, invitations and serving quantities for gatherings of any size.
Crafts & Maker5 calculatorsPlan yarn, fabric, resin and 3D-printing materials with practical waste and cost allowances.
Popular starting points
Useful before you buy, build, move, or host
Paint CalculatorEstimate gallons of wall paint for a rectangular room, including doors, windows, coats and waste.
EV Home Charging Cost CalculatorEstimate the electricity and cost required to add a given amount of energy to an EV battery at home.
Gas Trip Cost CalculatorEstimate gallons of fuel and fuel cost for a trip from distance, MPG and gas price.
Moving Box CalculatorEstimate a starting box count from home size and how densely packed the household is.
TV Size by Viewing Distance CalculatorEstimate a comfortable 16:9 TV diagonal range from seating distance.
Party Drink CalculatorEstimate total drink servings for a party using guest count, duration and drinks-per-hour assumptions.
Solar Payback CalculatorEstimate simple payback time and lifetime net savings for a solar project.
3D Printing Cost CalculatorEstimate filament, electricity and machine-time cost for a 3D print.
How it works
A useful answer in three steps
Each calculator keeps the assumptions visible. You provide the numbers and get the estimate immediately. Copying or sharing the result is optional.
- 1Enter your real inputs
Replace the sensible defaults with measurements and assumptions that match your situation.
- 2Get the result instantly
No account or email is required. The calculator reveals the full result as soon as the calculation succeeds.
- 3Copy or share it if useful
The full result is available immediately, with copy/share controls and the formula and limitations below.
Not sure where to start?
Browse calculatorsSearch the full calculator library.
Filter all 140 calculators by keyword or category.
Practical answers
Browse guides →Popular questions, explained simply
GuideHow Much Paint for a 1,500 Sq Ft House?A practical way to estimate wall-paint gallons for a 1,500 sq ft home without confusing floor area with paintable wall area.Read guide →GuideHow Much Paint for a 12×12 Room?Estimate gallons for a 12×12 room using wall height, openings, coats, coverage and a practical waste allowance.Read guide →GuideHow Much Flooring Do I Need?Calculate flooring area, add a realistic waste allowance and convert the result into boxes before ordering.Read guide →