100 practical calculators
Get the number you need.
Get the number you need.
No spreadsheet required.
FigureFast turns everyday measurements and assumptions into clear planning estimates—for home projects, energy, travel, moving, events, and maker projects.
✓ No account✓ Transparent formulas✓ Result emailed + shown
Quick estimateExample
How much paint for a 12 × 10 ft room?
8 ft walls2 coats10% waste
Purchase estimate2 gallonsbased on 350 sq ft / gallon
Open Paint Calculator →
Browse by task
See all 100 →Start with what you're trying to figure out
Home Improvement25 calculatorsPlan materials before the hardware-store run: paint, flooring, concrete, roofing, trim, framing and more.
Energy & Appliances20 calculatorsEstimate electricity use, charging time, equipment size, operating cost and energy savings.
Vehicle & Travel20 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 & Food15 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, request your result, and receive the same estimate on screen and by email.
- 1Enter your real inputs
Replace the sensible defaults with measurements and assumptions that match your situation.
- 2Add the email for delivery
The result stays hidden until the transactional result email is accepted for delivery. Marketing consent is separate and optional.
- 3See the result and method
Use the on-screen result, keep the emailed copy, and review the formula and limitations before acting.
Not sure where to start?
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