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Thailand calculators in English

Work out Thai income tax, take-home pay, social security, electricity bills and property fees. Free, no sign-up, and every rate comes straight from the Thai authority responsible for it.

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Money & tax

43 calculators

Thai Bonus Withholding Tax Calculator

Calculate the withholding tax in the month you receive a bonus using the Revenue Department method, from your salary, bonus and the allowances notified to your employer, plus the bonus left after tax.

Business Break-even Calculator

Find the minimum whole units needed to cover fixed costs, variable unit costs and selling fees. Compare the result with your planned sales volume.

Compound Interest Calculator

Project the future value of your savings with compound interest, from a starting sum plus a regular monthly contribution, with a year-by-year breakdown.

Savings Cooperative Dividend and Patronage Refund Calculator

Estimate the dividend on cooperative shares held all year plus monthly share purchases weighted by months held, and the patronage refund on loan interest paid to the cooperative.

Thailand Corporate Income Tax Calculator

Calculate Thai corporate income tax on net profit, check whether your company qualifies for the reduced SME rates, and see why the 10% figure still quoted online expired after the 2016 accounting period.

Monthly DCA Investment Calculator

See how a portfolio could grow with the same investment every month, including a starting lump sum, purchase fees and yearly increases, with a year-by-year table.

Thailand Deposit Interest Calculator

Interest on Thai savings and fixed deposit accounts with the 15% withholding tax applied automatically, so you see what actually reaches your account.

Thai Dividend Tax Credit Calculator

Work out the dividend tax credit under section 47 bis and compare including dividends in your annual return with keeping the 10% withholding as final tax, to see which refunds more or costs less.

Thai Donation Tax Deduction Calculator

Work out Thai donation deductions under Revenue Department rules, both items deductible at 2× and general donations capped at 10% of income after expenses and other allowances, and the tax saved.

Emergency Fund Calculator

Estimate an emergency reserve from essential monthly expenses and your chosen coverage period. See the target, shortfall and months currently covered.

Thai Employer Cost per Employee Calculator

Add up an employer's yearly cost for one employee: salary, bonus, employer social security, Workmen's Compensation Fund contributions, provident fund matching, benefits and allowances.

Freelance Rate Calculator

Set an hourly and daily freelance rate from your target income, business costs, insurance and savings, a tax reserve and realistic billable hours, and see cash received after 3% withholding tax.

Thailand Gift Tax Calculator

Calculate Thai income tax on gifts of money or movable property from parents, children, a spouse or others by custom, and on real estate transferred by parents to their children, counting earlier gifts in the same tax year.

Thai Gold Price by Weight Calculator

Convert Thai gold weight between baht, salung and grams, then work out the purchase price with making charges, the resale value and the round-trip loss for 96.5% bars or ornaments using your shop's quoted prices.

Thailand Half-Year Personal Income Tax (PND 94)

Work out the Thai half-year tax return for rental, freelance, contracting and business income earned January to June — including the rule most people miss, that allowances are halved.

Thailand Personal Income Tax Calculator

Work out Thai personal income tax on salary and bonus — expenses and deductions applied automatically, tax shown bracket by bracket. Free, no sign-up.

Inflation and Purchasing Power Calculator

See how much today's price may rise in future, or what a future sum is worth today, at an average inflation rate, plus the real return after inflation.

Thailand Inheritance Tax Calculator

Calculate Thai inheritance tax under the Inheritance Tax Act 2015 from the property received from one deceased, less inherited debts, on the part above THB 100 million at the rate for your relationship.

Thai Job Offer Comparison Calculator

Compare two job offers over a year, including salary, bonus, social security, income tax, employer provident fund match, benefits and commuting, to see which gives more net value.

Thailand Late Tax Filing Calculator

Filed your Thai tax return late? Work out the 1.5% monthly surcharge and its legal cap under Section 27, straight from Revenue Department sources.

Online Marketplace Fee and Payout Calculator

Work out commission, payment and service fees plus VAT on those fees to see the actual payout, profit per order and margin, using the rates your platform gives your shop.

Thailand Maternity Leave and Pay Calculator

Work out what you receive during Thai maternity leave under the new 120-day law — employer wages plus the two social security payments — and the 15 days of paid spousal leave granted for the first time.

Thailand Net Salary Calculator

Your real take-home pay in Thailand after income tax, social security and provident fund — see exactly what lands in your account each month. Free.

Thailand Online Seller Tax Calculator

How much tax an online seller in Thailand owes: 60% flat expenses, the 0.5%-of-sales method compared automatically, and the 1.8M baht VAT threshold.

Thailand Overtime Pay Calculator

Overtime under Thai labour law: 1.5x on a working day, holiday pay, and 3x for overtime on a holiday. Covers monthly and daily paid staff.

Thailand Social Security Pension Calculator

The monthly old-age pension from Thai social security, from months contributed and average wage, compared against the lump sum paid under 180 months.

Product Profit Margin Calculator

Include product cost, packaging, seller-paid shipping and sales fees. See per-item profit, margin, markup and total contribution before fixed costs.

Thai Provident Fund Calculator

Project a Thai provident fund balance from 2–15% employee savings, employer contributions, returns and pay rises, with the amount after the employer vesting share on leaving and the first-year tax saving.

Thai Rental Income Tax Calculator

Work out the extra personal income tax from 40(5) rental income, with the flat expense rate for each asset type, other income and allowances, less the 5% withheld by a company tenant.

Retirement Savings Calculator

Estimate the lump sum needed at retirement from today's monthly spending, inflation and returns before and after retirement, then find the extra saving needed each month.

Savings Goal Calculator

Turn a savings target into a monthly plan. Account for money already saved and see the remaining gap, progress and planned final balance.

Target-Margin Selling Price Calculator with Thai VAT

Find a unit selling price from cost, target margin and selling fees, then add 7% VAT if the shop is VAT-registered, so the margin you planned is what you actually keep rather than a simple markup on cost.

Thailand Severance Pay Calculator

Severance owed on termination under Section 118 of the Labour Protection Act, including the 400-day tier at 20 years of service. Free, no sign-up.

Thai Tax on Severance and Retirement Lump Sums

Calculate tax on a one-off payment on leaving employment using the separate method in section 48(5), including the severance-pay exemption up to THB 300,000, the THB 7,000 per year of service deduction and the further 50% deduction.

Thailand Social Security Contribution Calculator

Your Thai social security contribution under Section 33, 39 or 40 at 2026 rates, after the wage ceiling rose to 17,500 baht and the cap to 875 a month.

Thailand Stamp Duty Calculator

Calculate Thai stamp duty on land or building leases, hire-of-work contracts, hire-purchase and loan agreements under the Revenue Department schedule, including fractions and the loan cap.

Thailand Tax Refund Calculator

Compare the Thai tax withheld from your pay against what you actually owe, and see if you get a refund before you file. Revenue Department rates. Free.

Thailand Exchange and Fee Calculator

Compare two exchange quotes including fixed and percentage fees. Calculate net Thai baht received or the source-currency cost of card payments and ATM cash.

Thailand Tourist VAT Refund Calculator

Estimate Thailand tourist VAT refunds for 1–8 P.P.10 forms. Apply the official table separately, check the 60-day limit and deduct entered payout fees in THB.

Thailand Social Security Unemployment Benefit

Work out the Thai social security unemployment benefit — 60% of wages after dismissal, 30% after resignation — including the registration deadline that quietly costs many claimants weeks of payments.

Thailand VAT Calculator

Add 7% Thai VAT to a net price, or extract the VAT from a VAT-inclusive total. Includes the formula and an explanation of the mistake most people make.

Thailand Withholding Tax Calculator

Work out Thai withholding tax by type of payment — contracting, services, rent, advertising, transport — with VAT separated out correctly.

Thai Work Injury Compensation Calculator

Calculate Workmen's Compensation Fund payments when an employee injured or ill because of work is told by a doctor to stop working: 70% of monthly wages, up to THB 14,000 a month.

Loans & instalments

10 calculators

Thailand Credit Card Interest Calculator

Work out credit card interest at the Bank of Thailand 16% annual cap, and see how many years minimum payments take and what they cost in total interest.

Debt Payoff Planner

Combine up to four credit card, personal loan or other debts, choose highest-rate-first or smallest-balance-first, and see how many months it takes and the interest saved versus minimum payments.

Thai Legal Default Interest Calculator (5%)

Calculate default interest under the Civil and Commercial Code as amended in 2021, at 5% a year, or the 3% statutory rate when no rate was agreed, as simple interest by days.

Thailand Home Loan Calculator

Work out the monthly payment on a Thai mortgage with a full amortisation schedule, showing total interest and how quickly the principal comes down.

0% Installment vs Cash Discount Calculator

Compare a 0% installment plan with a cash discount. Find the hidden annual interest in the installment, the monthly payment and the value of keeping your cash invested while you pay.

Thailand Borrowing Capacity Calculator

Work out how much you could borrow for a home in Thailand on the debt-to-income rule banks apply, and what property price that puts within reach.

Compare Two Loan Offers

Compare home, car or personal loan offers from two lenders for the same amount, including rate, term and up-front fees, to see the monthly payment, total cost and effective cost rate with fees.

Mortgage Prepayment Calculator

See how many months an extra monthly payment or a one-off lump sum takes off your home loan, and how much interest it saves, while keeping the same instalment and a fixed rate.

Personal Loan Flat Rate to Effective Rate Calculator

Convert a personal or vehicle-title loan's flat rate into the effective yearly rate on a reducing balance, including fees deducted at drawdown, and compare with the Bank of Thailand cap.

Thailand Mortgage Refinance Calculator

Compare your current Thai home loan against a new offer: monthly saving, total saving, and how many months it takes to recover the refinancing costs.

Home & bills

18 calculators

Air Conditioner Size Calculator (BTU)

Work out how many BTU your room needs, get the nearest standard unit size sold in Thailand, and estimate the monthly running cost.

Appliance Energy Cost Calculator

Estimate an appliance’s energy use and cost from watts, daily operating hours, days and quantity. Compare usage choices using your own electricity rate.

Thai Property Agent Commission Calculator

Work out a property agent's commission from the sale price and agreed rate, add VAT if the agent is registered, deduct 3% withholding when the payer is a company, and split a share with a co-agent.

Concrete Volume Calculator

Calculate concrete volume in cubic metres for slabs, beams, footings or round columns, add a waste allowance and estimate the ready-mix cost from a price per cubic metre.

Condo Common Fee and Sinking Fund Calculator

Work out the monthly common fee, the fee paid in advance and the sinking fund due on condominium transfer day, from the unit area and the per-square-metre rates set by the juristic person.

Thailand Electricity Bill Calculator

A Thai home electricity bill on the tiered tariff — service charge, Ft and 7% VAT included, at MEA rates for the September 2026 cycle onward.

House Construction Budget Calculator

Estimate a house building budget from floor area and construction price per square metre, including design, permits, fencing and external works and a contingency, to plan funds and compare contractor quotes.

Thailand Land and Building Tax Calculator

Work out Thai land and building tax from the government appraised value, by type of use, with the 50 million baht main-home exemption applied automatically and the banded rates of the Royal Decree — not a single rate on the whole value.

Paint and Tile Quantity Calculator

Work out how much paint or how many floor tiles a room needs, with door and window areas deducted and a waste allowance included.

Thailand Property Transfer Fee Calculator

Transfer fee, specific business tax, stamp duty and mortgage fee due at the Land Office — plus why the 0.01% reduction is for Thai nationals only.

Rent vs Buy Calculator

Compare your wealth after buying with a mortgage versus renting and investing the down payment and monthly difference, including purchase costs, upkeep, rent increases, home prices and selling costs.

Thai Rental Room Electricity and Water Charge Calculator

Work out the maximum electricity and water rates a residential landlord may charge from its own utility bills, multiply by your room's sub-meter units and compare with the rate you are charged.

Rental Yield Calculator

Find gross and net rental yield for a condo or house, including vacant months, common fees, repairs, taxes and a simple payback period.

Solar Rooftop Payback Calculator

Estimate generation, bill savings, surplus export income and payback for a home rooftop solar system, using the public residential buyback rate as a default.

Subscription Cost Calculator

Add recurring app, streaming and software costs. Convert annual bills to monthly averages and estimate multi-year spending and cancellation savings.

Thailand Living and Move-In Budget

Plan monthly living costs in Thailand and cash needed to move in. Separate first rent, deposits, advance rent, setup and reserves, then compare income and savings.

Unit Price Comparison

Compare two product sizes or multipacks using final price, quantity per item and item count. See unit prices and the percentage difference.

Thailand Water Bill Calculator

Enter your cubic metres: MWA tiered rates, the monthly service charge by meter size and 7% VAT. Covers Bangkok, Nonthaburi and Samut Prakan.

Vehicles

9 calculators

Bangkok Taxi Fare Calculator

Estimate a Bangkok taxi fare or total a final meter reading. Separate distance, slow traffic, airport pickup, tolls and baggage in THB, with official rate sources.

Thailand Car Loan Calculator

Monthly payments on new and used cars in Thailand at the flat rate lenders quote, with a schedule and the effective rate checked against the legal cap.

Car Ownership Cost Calculator

Add up depreciation, finance interest, fuel, insurance, road tax and compulsory insurance, maintenance and parking to see the real cost of owning a car per month and per kilometre.

Early Settlement Calculator for a Thai Car Loan

Work out what it costs to settle a Thai car hire-purchase agreement early, including the 60/70/100 percent interest rebate the law requires, and whether waiting a few more payments is cheaper.

Thailand Road Tax Calculator

Annual Thai road tax from engine size and vehicle age, including the discount for older cars and the penalty for renewing late. Free, no sign-up.

EV Charging Cost Calculator

Estimate EV charging energy, cost and time from battery capacity and charge levels. Include efficiency losses, your electricity price and a session fee.

EV vs Petrol Car Cost Comparison

Compare yearly energy and maintenance costs of an electric car and a petrol car from your real mileage, charging rate and fuel price, then find the payback on the price difference.

Trip Fuel Cost Calculator

Estimate trip fuel use and cost from distance and fuel economy. Add tolls and parking, then split the total using your own fuel price.

Delivery Rider and Ride-hailing Driver Net Income Calculator

Work out net monthly, hourly and per-job income for delivery riders or ride-hailing drivers after platform commission, fuel, wear and monthly costs.

Health & life

3 calculators

BMI, BMR and TDEE Calculator — Asian Thresholds

Your BMI on the Asia-Pacific thresholds, where overweight starts at 23 not 25, plus the healthy weight range in kg for your height, BMR and TDEE. Free.

Due Date and Gestational Age Calculator

Work out an estimated due date and current gestational age in weeks from the first day of your last period, adjusted for your actual cycle length.

Running Pace and Finish Time Calculator

Convert running distance and time into pace and speed, then project 5K, 10K, half-marathon and marathon times at that same constant pace.

General & conversion

17 calculators