Thai calculators
Thai income tax, take-home pay, VAT, withholding tax, Buddhist year, holidays and more
Thai income tax
Enter your income and allowances to see the tax you owe — or the refund you can claim.
Net salary
Enter your monthly salary to see what reaches your bank account after social security, provident fund and withholding tax.
Currency converter
Convert Thai baht to dollars, euros, yen, yuan and more with the latest reference rates.
Split the bill
Enter the total and number of people; service charge, VAT and tip are added and each share is rounded up.
Hourly wage
Turn any pay into hourly, daily, weekly, monthly and yearly figures, plus overtime rates.
Credit card interest
Enter your balance, interest rate and minimum payment to see how many months it takes and the total interest — versus paying more.
Thai VAT 7%
Enter an amount and choose to add VAT or take it out. Get the price before VAT, the VAT and the total.
Withholding tax
Work out withholding tax and VAT on an invoice, what you actually receive, or how much to invoice to receive a set amount.
Number to Thai words
Type an amount and get it in Thai words, e.g. 1,250 → หนึ่งพันสองร้อยห้าสิบบาทถ้วน — ready to copy.
Number to English words
Type a number to get it in English words, as a dollar amount and in cheque style.
Thai numerals converter
Paste text and swap 0–9 for Thai digits, or back again, in one click.
Roman numerals converter
Type a number to see it in Roman numerals, or Roman numerals to see the number — from 1 to 3,999.
Number base converter
Enter a number in any base and see it in binary, octal, decimal and hexadecimal at once.
ROI calculator
Enter the amount invested and the value returned to get the return in %, profit, multiple and annualised return.
Profit margin
Enter revenue, cost of goods and expenses to get each level of profit and margin, plus markup.
Break-even calculator
Enter fixed costs, price and cost per unit to see how many units or how much revenue you need to break even.
Discount calculator
Enter a price and % off to get the sale price, stack two discounts, take off a fixed amount, or work back to the original price.
Buddhist year converter
Convert years and full dates between the Thai Buddhist calendar and the Western calendar.
Thai public holidays
All Thai public holidays and substitution days of the year, with a countdown to the next one.
Buddhist holy days (wan phra)
The next wan phra and every Buddhist holy day of the year (waxing and waning 8th and 15th days).
Time calculator
Add or subtract several times, e.g. 1:45 + 2:30 − 0:20, and get the total in hours, minutes and decimal hours.
BMR calculator
Enter sex, age, weight and height to get your BMR with Mifflin-St Jeor and Harris-Benedict (and Katch-McArdle with body fat %).
Body fat calculator
Measure your waist, neck (and hips for women) to estimate body fat %, fat mass and lean mass.
Macro calculator
Enter your daily calories and goal to get protein, carbohydrate and fat in grams for the split you choose.
Heart rate zones
Enter your age (and resting heart rate) to get your maximum heart rate and five training zones.
Steps to distance
Enter steps, height and weight to get distance, time and calories burned, walking or running.
Sleep calculator
Enter when you need to wake to get bedtimes that match 90-minute sleep cycles, or enter a bedtime to find the best wake-up time.
Calculator
Tap the keys or type a formula — brackets, powers, square roots, percentages, sin cos tan, log and factorials.
Ratio calculator
Fill three of A : B = C : D to get the fourth, or just A : B to simplify it.
Slope calculator
Enter a slope in any form to get it as a percentage, in degrees and as a 1:N ratio — for ramps, roofs and roads.
Ohm's law calculator
Enter any two of V, I, R and P to get the other two, with the formulas used.
Gacha odds
Enter the drop rate (%) and number of pulls to see your chance, and how many pulls give a 50% or 90% chance.
About Thai calculators
Practical calculators for living, working and doing business in Thailand, built around Thai rules: income tax brackets and allowances, social security, VAT and withholding tax, the Buddhist calendar and Thai land units.
Everything runs in your browser, is free and works on your phone. Each result can be shared with a link.
FAQ
Are the tax numbers up to date?
They follow the current Thai rules and are reviewed every tax year. Treat results as estimates and check official sources before filing.
Is it free?
Yes, every calculator is free with no limit.
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