Free Online Calculators for DIY, Finance, Health & More

Fence Picket Spacing

Plan equal picket gaps across a fence run before cutting or installing boards.

EV Charge Time

Estimate charging time from battery size, state of charge, and charger power.

Airbnb True Cost

Compare nightly price, cleaning fees, service fees, taxes, and stay length.

BMI Calculator

Calculate body mass index with clear category notes and health limitations.

Compound Interest

Project savings or investment growth with recurring contributions and time.

Aspect Ratio

Resize images and videos while preserving the original proportions.

Fence Picket Spacing

Find equal picket gaps for a clean fence layout.

Raised Bed Soil

Estimate soil volume for rectangular beds and containers.

Mulch Coverage

Convert area and depth into mulch volume.

Deck Board Spacing

Plan board count, gaps, and layout width.

Tile & Grout Spacing

Estimate tile layout and grout spacing.

Epoxy Resin Volume

Calculate resin volume for pours and molds.

Lawn Fertilizer

Translate fertilizer rates into product amount.

Retaining Wall Blocks

Estimate blocks, rows, caps, and wall materials.

Firewood Cord

Compare stacked wood volume against full cords.

Gutter Pitch

Calculate the drop needed for drainage slope.

Stair Stringer

Work out rise, run, tread count, and stair angle.

TV Viewing Distance

Estimate comfortable screen size and viewing distance.

Paint Coverage

Estimate gallons needed from wall area and coats.

Wallpaper Rolls

Plan roll count from room size and pattern repeat.

Hardwood Flooring

Calculate cartons with waste allowance.

Concrete Slab

Convert slab dimensions into concrete volume.

Grass Seed

Estimate seed quantity for new lawns or overseeding.

Driveway Gravel

Calculate gravel volume and weight for coverage.

Roof Shingles

Estimate roof squares and shingle bundles.

AC Tonnage

Estimate cooling capacity from room size and factors.

Compound Interest

Model growth from principal, rate, and time.

ROI Calculator

Compare gain, cost, and return percentage.

Inflation Calculator

Estimate purchasing power changes over time.

Car Loan Payment

Estimate monthly payments from price, rate, and term.

Hourly to Salary

Convert hourly pay into annual salary.

Salary to Hourly

Convert annual salary into hourly pay.

Freelance Rate

Plan billable rates from expenses and work hours.

Etsy Fees

Estimate fees and profit for shop listings.

Stripe Fees

Estimate processing fees and net receipts.

YouTube AdSense

Estimate revenue from views and CPM assumptions.

YouTube CPM

Convert ad spend and impressions into CPM.

Twitch Sub Revenue

Estimate subscription revenue by tier and split.

TikTok Creator Fund

Estimate creator payouts from views and RPM.

Patreon Revenue

Project membership income after fees.

Server Cost

Estimate hosting costs from usage and resources.

Currency Fees

Calculate markup and conversion costs.

BMI Calculator

Calculate BMI and review common category ranges.

BMR Calculator

Estimate resting calorie needs from body metrics.

Water Intake

Estimate daily hydration needs for planning.

Protein Intake

Estimate protein targets by weight and goal.

One Rep Max

Estimate strength max from reps and weight.

Wilks Score

Compare powerlifting totals across body weights.

Treadmill Incline

Estimate effort and calorie impact from incline.

Marathon Pace

Break race goals into pace and splits.

Pregnancy Due Date

Estimate due date from cycle or conception date.

BAC Estimator

Estimate blood alcohol concentration for awareness.

Dog Age

Estimate dog age in human-year equivalents.

Cat Calories

Estimate daily calorie needs for cats.

Raw Dog Food

Estimate feeding portions by body weight.

Reptile Temperature

Plan tank temperature gradients.

Pizza Dough

Scale dough ingredients by hydration and ball count.

Brisket Time

Estimate smoking time by weight and temperature.

Coffee Ratio

Calculate coffee and water amounts for brewing.

Sourdough Hydration

Calculate flour, water, starter, and salt ratios.

Turkey Time

Estimate roasting time from bird weight.

Rice Ratio

Scale rice and water by grain type.

TikTok Safe Zone

Check safe areas for vertical video overlays.

Aspect Ratio

Resize visual assets without distortion.

Video File Size

Estimate storage needs from bitrate and length.

Instagram Grid

Plan image splits for profile grids.

Upload Time

Estimate upload duration from file size and speed.

Focal Length

Compare field of view across sensors and lenses.

Podcast Storage

Estimate audio storage by bitrate and episode length.

Input Lag

Convert frame delay into milliseconds.

PC Bottleneck

Estimate balance between CPU and GPU choices.

Monitor PPI

Calculate pixel density from size and resolution.

UPS Runtime

Estimate backup time from load and battery capacity.

Mouse DPI

Convert sensitivity settings across games.

Steam Level Cost

Estimate trading card cost to level up.

WoW Token

Compare token value against game time.

Crypto Mining

Estimate mining profit from power and hashrate.

RAID Capacity

Compare usable storage across RAID levels.

Key Switch Force

Compare keyboard switch force and feel.

Binary Converter

Convert binary, decimal, and hexadecimal values.

Random Number

Generate random numbers within a chosen range.

3D Print Cost

Estimate filament, electricity, and print costs.

Filament Remainder

Estimate filament left on a spool.

Resin Wash

Estimate wash cost and solvent usage.

Road Trip Gas

Estimate fuel cost for a route.

Time Zone

Compare times across locations.

Layover Risk

Estimate connection risk from layover factors.

Hotel Points

Calculate cents-per-point value.

Suitcase Weight

Estimate packed luggage weight.

Packing Cube

Plan packing cube volume and fit.

Airbnb True Cost

Compare fees, taxes, and nightly rates.

Uber vs Rental

Compare ride costs against rental car costs.

MPG Calculator

Calculate fuel economy from miles and gallons.

EV Charge Time

Estimate electric vehicle charging time.

Tire Size

Compare tire diameter, sidewall, and speed impact.

Chain Slack

Estimate motorcycle chain slack measurements.

Percent Difference

Compare two values as a percentage difference.

Fraction to Decimal

Convert common and custom fractions.

Aquarium Dosing

Calculate additive dosing for target concentration.

Aquarium Stocking

Estimate bioload and stocking capacity.

Knitting Yardage

Estimate yarn needed for projects.

Cross Stitch Fabric

Calculate final fabric size from stitch count.

Card Sleeves

Estimate sleeves needed for cards and games.

Tabletop Points

Track army points for tabletop games.

Model Train Speed

Convert model speed to scale speed.