Experimental lab — results are estimates for general knowledge, not financial, tax or investment advice
Lab
Calculators and games we are trying out — free, no signup. Everything is computed in your browser and never sent anywhere.
Shop · shipping · costs
Stacked discounts
10% then another 5% — what is the real total?
Try it →Unit price compare
Which pack is the better deal
Try it →Parcel shipping cost
Carriers bill the larger of actual or volumetric weight
Try it →Price from cost
Include packaging, shipping and platform fees, then find the price for your target margin
Try it →Profit per unit / month
What is left after all costs at this price
Try it →Markup vs margin
A 50% markup is not a 50% margin
Try it →Reorder point
When to reorder so you never run out
Try it →Maximum safe discount
Before a campaign: how far you can discount and still keep your minimum margin
Try it →
Saving · loans · investing · tax
Loan payment
Monthly payment for a loan
Try it →Flat rate vs real rate
What a flat-rate installment really costs per year
Try it →Savings growth
What regular saving grows into
Try it →Income tax estimate
Rough yearly personal income tax (Thailand)
Try it →Savings goal
Monthly saving needed to reach a target
Try it →Debt payoff time
How long a fixed payment takes to clear a balance
Try it →Inflation impact
What today's money buys in the future
Try it →CAGR
Average yearly growth between two values
Try it →ROI
Return on an investment, also annualised
Try it →Dividend income
Yearly dividend after withholding tax
Try it →Net salary estimate
Take-home pay after social security and tax (Thailand)
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Business
Break-even
How many units until you recover costs
Try it →Freelance hourly rate
What to charge per hour to hit your income goal
Try it →Cash runway
How many months your cash lasts
Try it →LTV / CAC
Lifetime profit of a customer vs the cost to win them
Try it →Payback period
How long an equipment or investment takes to pay itself back
Try it →Depreciation (straight line)
Yearly write-off for equipment over its useful life
Try it →Units needed for a profit goal
Fixed costs plus target profit, converted to units per month and per day
Try it →Five monthly numbers
Revenue, gross margin, order value, repeat rate and cash runway in one place
Try it →
General tools
Free everyday tools
Age calculator
Age in years, months, days, and days until the next birthday
Try it →Number to Thai baht words
Enter an amount, get the Thai words for quotations and receipts
Try it →Password generator
Secure random in your browser — never sent or stored
Try it →Colour converter + contrast
Is this text readable on this background? (WCAG)
Try it →Text and list tools
Dedupe, sort, trim, change case, make slugs
Try it →JSON formatter
Validate, prettify or minify JSON
Try it →
Payments
Games
2048
Slide and merge tiles up to 2048
Try it →Memory match
Flip cards and find all pairs in the fewest moves
Try it →Minesweeper
First click is always safe · right-click or long-press to flag
Try it →Connect Four
Versus the bot or a friend on one device
Try it →Snake
Eat to grow · arrow keys, swipe or on-screen buttons
Try it →Word guess
6 tries — colours show right spot / wrong spot / absent
Try it →Reversi
Outflank the bot's discs · corners matter most
Try it →Sliding number puzzle
Slide tiles into the gap until they read in order · 3×3 or 4×4
Try it →