103 free browser tools · No sign-up

Free online calculators & utilities

Plan a trip, organize a walking club, compare a purchase, format text or estimate a home project without creating an account. These tools run in your browser and do not send your entries to us.

Browse all 103 free tools

Travel & vehicle calculators Shopping calculators Salary, commission & overtime Digital utilities Home calculators Health & fitness

Travel, vehicles & moving

Plan before you buy, pack or depart

Vehicle value · fuel economy · moving · costs · luggage · world time

300% search growth

Coolcation Trip Planner

Compare destination temperatures and calculate total and per-traveler costs.

Plan a cooler trip → 2026 autumn forecast

Japan Autumn Foliage Date Planner

Compare trip dates with official yellow ginkgo and red maple forecasts for 14 cities.

Check foliage dates → Trip budget

Travel Budget Calculator

Estimate flights, lodging, food, transport, activities and a contingency buffer.

Calculate trip cost → Professional vs DIY

Moving Cost Calculator

Compare a written mover quote with truck rental, mileage, fuel, supplies, helpers and other DIY costs.

Compare moving costs → Moving supplies

Moving Box Calculator

Estimate five box types, tape, labels and supply cost from your household and belongings.

Estimate moving boxes → Storage size and cost

Storage Unit Size & Cost Calculator

Turn an inventory into a capacity target and calculate the full term after promotions and fees.

Estimate storage → Driving cost

Road Trip Fuel Cost Calculator

Use MPG or L/100km to calculate fuel needed, total cost and each person’s share.

Calculate fuel cost → US and metric fuel economy

MPG to L/100km Converter

Convert US MPG, UK MPG, liters per 100 km and kilometers per liter instantly.

Convert fuel economy → Vehicle value by year

Car Depreciation Calculator

Estimate retained value, total depreciation and annual losses with adjustable rates.

Estimate car value → Mobile data

Travel eSIM Data Calculator

Estimate data for maps, social media, music, calls, video and hotspot use.

Estimate gigabytes → Baggage

Carry-On Size Checker

Compare your packed bag with an airline’s current size and weight limits.

Check your bag → Packing

Carry-On Packing List Generator

Create a checklist from trip length, climate, travel style and laundry access.

Build a list → World time

Time Zone Converter

Convert a local time between major cities and check destination working hours.

Convert time →Holiday dates

Holiday Countdown Calculator

Count down to Christmas, Halloween, New Year, Black Friday or a custom date.

Start countdown →Trending sports event

Asian Games 2026 Countdown

Count down to the opening ceremony and convert Japan event times to your local time zone.

Open countdown →

Creative hobbies

Plan a hands-on hobby and its budget

Letters · stationery · crafts · gatherings

Analog hobby trend

Crochet Yarn & Project Cost Calculator

Estimate yarn length, skeins, safety allowance, leftovers, materials and total project cost.

Plan a project →110% search growth

Pen Pal Letter, Postage & Stationery Planner

Calculate letters, stamps, envelopes, gifts, monthly cost and annual correspondence budget.

Plan your letters →1,713% search growth

Birthday Magazine Planner

Plan pages, photos, production time and printing cost for a custom birthday magazine.

Plan a magazine →457% search growth

Pressed Flower Frame Planner

Estimate flower layout, drying completion date, materials and frame cost.

Plan a frame →

Shopping & dining

Understand price, value and margin

Fragrance · fashion · jewelry · margin · discounts · value · tips

167% search growth

Fragrance Wardrobe Cost-per-Wear Planner

Compare full bottles and discovery sets by sprays, wears, sample coverage and collection value.

Compare fragrance value →14× search surge

Flip-Flop Cost Per Wear Calculator

Compare purchase value, projected wears and luggage weight across one or more pairs.

Plan your pairs →Breakout snack trend

Date Fruit Serving & Cost Calculator

Compare price per date and scale package calories, sugar and fiber to your serving.

Compare a pack →Trending dessert

Tiramisu Recipe Calculator

Scale classic ingredients by servings and estimate pan size, caffeine and optional liqueur.

Scale the recipe →Gold purity and resale

Gold Jewelry Value Calculator

Estimate pure gold content, raw metal value, retail cost and an indicative resale payout.

Calculate jewelry value → Shipping weight

Dimensional Weight Calculator

Compare actual and volumetric weight with a custom carrier divisor and right-sized box.

Calculate DIM weight → Margin, markup and target price

Profit Margin Calculator

Calculate profit, margin, markup, per-unit results and the price needed for a target margin.

Calculate profit margin → Fixed costs and unit economics

Break-Even Calculator

Calculate break-even units and revenue, contribution margin, expected profit and margin of safety.

Find the break-even point → Marketplace fees and net profit

Selling Fee Calculator

Estimate platform and payment fees, total costs, profit margin and break-even selling price.

Calculate selling profit → Investment and campaign returns

ROI Calculator

Calculate net return, ROI, return multiple, annualized ROI and the return needed for a target.

Calculate ROI → Marketing cost and customer value

CAC Calculator

Calculate customer acquisition cost, estimated LTV, LTV:CAC ratio and payback period.

Calculate CAC → Revenue, margin and churn

LTV Calculator

Estimate customer lifetime value, lifetime, LTV:CAC ratio, payback and maximum acquisition cost.

Calculate customer LTV → Customer retention and growth

Churn Rate Calculator

Calculate churn, retention, customers lost, net growth and equivalent monthly and annual rates.

Calculate customer churn → Subscription and SaaS revenue

MRR Calculator

Calculate monthly recurring revenue, ARR, net new MRR, growth and revenue retention.

Calculate recurring revenue → Recurring revenue growth

ARR Growth Calculator

Calculate ARR growth, CAGR, monthly equivalent growth, MRR and the gap to a target.

Calculate ARR growth → Subscription planning

Subscription Revenue Forecast Calculator

Project customers, MRR, ARR and cumulative revenue from acquisition, churn and ARPU growth.

Forecast subscription revenue →Revenue retention

Revenue Churn Calculator

Calculate gross and net revenue churn, GRR, NRR, retained MRR and annualized losses.

Calculate revenue churn →Subscription profitability

Subscription Break-Even Calculator

Find break-even customers and MRR, CAC payback, LTV:CAC and monthly operating profit.

Calculate subscription break-even →SaaS sales efficiency

SaaS Magic Number Calculator

Measure annualized recurring revenue growth per sales and marketing dollar, with payback and target revenue.

Calculate SaaS Magic Number →SaaS growth and profit

Rule of 40 Calculator

Combine annual revenue growth and EBITDA margin, then find the gap and EBITDA needed to reach 40.

Calculate Rule of 40 →SaaS capital efficiency

Burn Multiple Calculator

Compare net cash burn with net new ARR, then estimate monthly burn, runway and a target burn limit.

Calculate Burn Multiple →Startup cash planning

Cash Runway Calculator

Forecast month-by-month cash, runway, break-even timing and target revenue or expense thresholds.

Forecast cash runway →SaaS growth efficiency

SaaS Quick Ratio Calculator

Compare new and expansion MRR with churn and contraction, then find the growth needed for your target ratio.

Calculate SaaS Quick Ratio →SaaS profitability

SaaS Gross Margin Calculator

Calculate gross profit and margin from revenue and direct service costs, then measure the gap to a target margin.

Calculate SaaS gross margin →SaaS valuation

SaaS Valuation Calculator

Estimate enterprise and equity value ranges from ARR multiples, cash and debt, plus fundraising dilution.

Estimate SaaS valuation →Startup equity

SaaS Dilution Calculator

Estimate investor, founder and employee ownership after a funding round, including share price and new shares.

Calculate equity dilution →Startup compensation

Stock Option Value Calculator

Estimate vested options, exercise cost, current and future value, estimated tax and fully diluted ownership.

Estimate stock option value →Startup equity schedule

Stock Option Vesting Calculator

Calculate vested and unvested options, cliff and full-vest dates, next vest date and tranche size.

Calculate option vesting →Startup option pool

Stock Option Pool Calculator

Calculate a pre-money option pool top-up, share price, investor ownership and existing holder dilution.

Calculate option pool dilution →SAFE conversion and dilution

SAFE Investment Calculator

Compare valuation-cap and discount conversion prices, shares and ownership after a priced round.

Estimate SAFE conversion →Startup note conversion

Convertible Note Calculator

Calculate accrued interest, cap or discount conversion price, shares and post-round ownership.

Estimate note conversion →Startup ownership model

Startup Cap Table Calculator

Model founder, employee, option-pool and investor shares before and after a priced round.

Build a cap table →Startup exit waterfall

Liquidation Preference Calculator

Compare non-participating, participating and capped preferred payouts with common conversion.

Calculate exit payouts →Startup down-round protection

Anti-Dilution Calculator

Compare broad-based weighted-average and full-ratchet conversion-price adjustments.

Compare anti-dilution →Startup valuation and ownership

Pre-Money & Post-Money Calculator

Calculate valuation, investor ownership, share price, new shares and founder dilution.

Calculate financing valuation →VC target-return valuation

Venture Capital Method Calculator

Work backward from exit value and target return to estimate valuation, ownership and share price.

Calculate VC valuation →Pre-revenue startup valuation

Startup Scorecard Valuation Calculator

Apply Bill Payne factor weights to a comparable median and estimate pre-money value and dilution.

Score startup valuation →Pre-revenue milestone valuation

Berkus Method Valuation Calculator

Value idea, prototype, team, relationships and rollout milestones, then estimate financing dilution.

Calculate Berkus valuation →12-factor startup valuation

Risk Factor Summation Calculator

Adjust a local baseline valuation with 12 management, market, technology, funding and exit risk scores.

Calculate risk-adjusted valuation →Startup replacement-cost valuation

Cost-to-Duplicate Valuation Calculator

Estimate the current cost to recreate product development, technology, equipment, data, IP and testing.

Calculate duplicate cost → Sale and checkout price

Discount Calculator

Calculate percent or fixed discounts, stacked offers, coupons, tax and fees—or reverse a sale price.

Compare the deal → Best value

Unit Price Calculator

Compare two package sizes by weight, volume, item or serving.

Compare products → Brand chart comparison

Shoe Size Converter

Compare adult US, UK, EU and centimeter sizes using current Nike, adidas and New Balance chart rows.

Compare shoe sizes → Everyday conversion

Metric & Imperial Unit Converter

Convert length, weight and temperature across common metric and imperial units.

Convert measurements → Files & internet speed

File Size & Download Time Calculator

Convert MB, GB and TB, then estimate transfer time from Mbps or Gbps.

Estimate transfer time → Words to minutes

Reading & Speaking Time Calculator

Estimate article, presentation, speech and voice-over time from word count.

Estimate duration → Cooking & servings

Recipe Scaling Calculator

Scale ingredient quantities up or down for any number of servings.

Scale a recipe → Restaurant bill

Tip & Split Bill Calculator

Calculate tip, tax, total bill and an even amount per person.

Split the bill →

Pay, numbers, dates & work

Answer common planning questions

Salary · commission · pay raises · overtime · work hours

Percentages

Percentage Calculator

Find a percentage amount, ratio, increase or decrease.

Calculate percentage → Date planning

Date Difference Calculator

Count days, weeks and weekdays or add and subtract days from a date.

Calculate dates → Age & birthday

Age Calculator

Find exact age, total days lived, day of birth and the next birthday countdown.

Calculate age → Weekly timesheet

Work Hours & Time Card Calculator

Total daily and weekly hours from clock-in, clock-out and unpaid breaks.

Calculate work hours → Annual, monthly and hourly pay

Salary to Hourly Calculator

Convert gross pay across yearly, monthly, biweekly, weekly, daily and hourly periods.

Convert salary and hourly pay → Regular, overtime and double time

Overtime Pay Calculator

Calculate weekly gross pay and projections with adjustable overtime and double-time multipliers.

Calculate overtime pay → Salary increase and inflation

Pay Raise Calculator

Calculate a raise by percentage or new pay and compare annual, monthly, weekly and hourly changes.

Calculate a pay raise → Flat and tiered sales commission

Commission Calculator

Calculate commission, base pay, bonuses, effective rate and projected annual earnings.

Calculate sales commission → Course & final grades

Grade Calculator

Calculate a weighted course grade and the final exam score needed for a target.

Calculate grades → Semester & cumulative GPA

GPA Calculator

Calculate GPA from letter grades and credits, then project a new cumulative GPA.

Calculate GPA →

Digital utilities

Handle common digital tasks

Writing · text formatting · data validation · password security

1,410% search growth

Cyberdeck Power & Budget Planner

Estimate load, battery runtime, required capacity and total custom-computer build cost.

Plan a cyberdeck →Developer IDs

UUID Generator

Generate and copy one or many secure random UUID v4 identifiers.

Generate UUIDs →Random numbers

Random Number Generator

Generate one or many whole numbers in a custom range, with optional duplicate exclusion.

Generate numbers →Writing & length

Word Counter

Count words, characters, sentences and paragraphs with reading and speaking time.

Count words →Random selection

Random Name Picker & Team Generator

Choose one name, shuffle a list or split entries into random teams.

Pick a name →Privacy & security

Secure Password Generator

Create a strong random password locally with custom length and character options.

Generate a password →Writing & formatting

Text Case Converter

Change text to uppercase, title, sentence, camel, snake or kebab case.

Convert text →Web addresses

URL Encoder & Decoder

Encode or decode full URLs, query values and special characters.

Convert a URL →Data encoding

Base64 Encoder & Decoder

Convert Unicode text to Base64 and decode standard or URL-safe values.

Convert Base64 →Developer data

JSON Formatter & Validator

Beautify, minify, sort and validate JSON with clear syntax errors.

Format JSON →

Home finance, energy and projects

Plan payments, materials and running costs

Mortgage · loans · savings · compound interest · concrete · tile · EV charging · wallpaper · paint · appliances

916% search growth

Home Café Cost & Savings Planner

Compare café and homemade drink costs, equipment payback and party ingredients.

Plan a home café →525% search spike

Dorm Room Layout & Budget Planner

Calculate furniture footprint, open floor area, rug coverage and move-in spending.

Plan a dorm room →1,713% search growth

Birthday Magazine Planner

Plan pages, photos, design time, printed copies and the complete project cost.

Plan a birthday magazine →457% search growth

Pressed Flower Frame Planner

Calculate a botanical layout, frames needed, ready date and material cost.

Plan a pressed-flower frame →Home loan estimate

Mortgage Calculator

Estimate principal, interest, property tax, insurance, fees and the total monthly payment.

Estimate mortgage payment →Payment and payoff

Loan Calculator

Estimate monthly payment, total interest and how extra payments may shorten the payoff.

Calculate a loan →Target and deadline

Savings Goal Calculator

Calculate the monthly savings needed to reach a target with an optional estimated return.

Plan a savings goal →Savings growth estimate

Compound Interest Calculator

Project growth from an initial deposit, monthly contributions, rate, time and compounding frequency.

Calculate compound growth →Volume and cost estimate

Concrete Calculator

Estimate volume, whole bags, rounded ready-mix quantity and material cost for slabs, footings and post holes.

Calculate concrete →Box and cost estimate

Tile Calculator

Estimate tiles, full boxes, purchased coverage and cost with a transparent cut and breakage allowance.

Calculate tiles →Vehicle energy

EV Charging Cost Calculator

Estimate session time, grid energy and monthly cost from your car, charger and electricity tariff.

Calculate EV charging →Pattern-aware estimate

Wallpaper Calculator

Estimate rolls, full drops and cost from wall size, trimming and the product's pattern repeat.

Calculate wallpaper →Home project

Paint Calculator

Estimate paint for walls and a ceiling, subtract openings and compare two can sizes by total purchase cost.

Calculate paint →Electricity cost

Appliance Electricity Cost Calculator

Convert watts and usage time into kWh, running cost and a comparison with a more efficient appliance.

Calculate electricity cost →

Clubs, health and fitness

Plan a social club, check a measure or pace a run

Mahjong clubs · walking clubs · running pace · adult BMI

193% search growth

Useful by design

Inputs stay on your device for these browser-only calculators.
Changing facts, such as airline baggage limits and local taxes, must be confirmed with the relevant provider.
No sign-up is required to use the tools listed here.

Common questions

Are these tools free?

Yes. Every tool on this page is free to use without creating an account.

Do you store what I enter?

No. These tools process your entries in the browser and do not submit them to our server.

Why might a checkout or travel total differ?

Live prices, taxes, fees, exchange rates, airline policies and local rules can change. Use each result as a planning estimate and confirm the final amount with the provider.