Everyday calculators for personal finance, health, lifestyle, and math — free and easy to use.
We've curated these tools specifically to help personal owners manage their finances and growth.
Calculate your Body Mass Index (BMI) using metric (kg/cm) or imperial (lb/in) units. BMI categories: Underweight < 18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese ≥ 30.
Apply the 50/30/20 budget rule to your monthly income. Split your salary into needs (50%), wants (30%), and savings or debt repayment (20%). Based on a typical Vietnamese monthly income of ~15,000,000 VND.
Calculate the fuel cost for any trip or monthly driving in Vietnam. Enter your distance, fuel consumption, and current petrol price to get instant results.
Estimate the approximate Vietnamese lunar calendar date from a solar (Gregorian) date. Enter a year (2020–2027), month, and day to get the estimated lunar month and day. Note: this uses a simplified approximation based on the Lunar New Year offset — for exact dates, use a dedicated lunar calendar application.
Calculate percentages in 4 modes: find what percent X is of Y, find X% of Y, calculate percent increase, or percent decrease between two values.
Convert between the most common units of length, weight, and volume instantly. Choose a conversion mode and enter your value to get the result.
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor or Harris-Benedict formula. Adjust for your activity level to find your daily calorie needs.
Convert cooking measurements between cups, tablespoons, teaspoons, milliliters, and grams for common ingredients like water, flour, sugar, and butter.
Calculate the true cost per kilometre of owning and driving a car in Vietnam, including depreciation, insurance, maintenance, and fuel.
Calculate how much you need in your emergency fund and how long it will take to reach your goal. Financial experts recommend saving 3–6 months of living expenses.
Calculate both Vietnamese age systems from your birth year. Tuổi ta (tuổi đời) is the standard calendar age: current year minus birth year. Tuổi mụ is the traditional Vietnamese lunar age, which counts the birth year itself as year 1 — so a person born in 1990 is already 1 year old at birth and turns 2 on the next Lunar New Year. Tuổi mụ is commonly used in traditional ceremonies, paperwork, and cultural contexts in Vietnam.
Calculate tip amount, total bill, and split the cost per person. Enter your bill amount, tip percentage, and number of people to split with.
Calculate your exact age in years, total months, and approximate total days from your date of birth. Enter your birth date and today's date to get instant results.
Calculate calories burned during exercise using the MET (Metabolic Equivalent of Task) method. Supports walking, running, cycling, swimming, yoga, and weight training.
Calculate monthly car loan payments using either the flat-rate or reducing-balance method used by Vietnamese banks. Supports 500M VND cars with 30% down payment.
Enter your birth year to find your Can Chi — the Heavenly Stem (Can) and Earthly Branch (Chi) from the Vietnamese/Chinese sexagenary calendar. The result shows two numeric indices; use the reference tables below to read the full name. Animal index (Chi): 0=Tý/Rat, 1=Sửu/Ox, 2=Dần/Tiger, 3=Mão/Rabbit, 4=Thìn/Dragon, 5=Tỵ/Snake, 6=Ngọ/Horse, 7=Mùi/Goat, 8=Thân/Monkey, 9=Dậu/Rooster, 10=Tuất/Dog, 11=Hợi/Pig Stem index (Can): 0=Giáp/Wood+, 1=Ất/Wood-, 2=Bính/Fire+, 3=Đinh/Fire-, 4=Mậu/Earth+, 5=Kỷ/Earth-, 6=Canh/Metal+, 7=Tân/Metal-, 8=Nhâm/Water+, 9=Quý/Water- Example: 1990 → animal_index=6 (Ngọ/Horse), stem_index=6 (Canh/Metal+) → Canh Ngọ.
Estimate your debt payoff timeline using the snowball method — pay off the smallest balance first to build momentum. Enter your total debt, monthly payment, and average interest rate for a simplified payoff estimate.
Calculate the discount amount, final price after discount, and total savings. Enter the original price and discount percentage to see how much you save.
Calculate the number of business days in any period by subtracting weekends and Vietnamese public holidays. Enter the total calendar days, the number of weekend days (Saturday + Sunday), and the number of public holidays falling on weekdays. Vietnam public holidays (11 days/year): Tết Nguyên Đán (5 days), Giỗ Tổ Hùng Vương 10/3 (1 day), Ngày Giải Phóng 30/4 (1 day), Ngày Quốc tế Lao động 1/5 (1 day), Quốc Khánh 2/9 (2 days).
Calculate the approximate number of days between two dates. Enter start and end dates as year, month, and day. Toggle inclusive or exclusive counting. Note: uses a 30-day month approximation; for exact results use a calendar app.
Estimate your debt payoff timeline using the avalanche method — pay off the highest interest rate debt first to minimize total interest paid. Enter your total debt, monthly payment, and average interest rate for a simplified payoff estimate.
Calculate the true total cost of owning a motorbike in Vietnam over multiple years, including depreciation, fuel, maintenance, and insurance.
Simplify ratios or solve cross-multiplication problems. Mode 1 expresses A:B as a decimal ratio. Mode 2 solves A/B = C/D for the unknown D.
Calculate the vehicle registration fee (lệ phí trước bạ) for cars and motorcycles in Vietnam based on vehicle value and province.
Calculate your recommended daily water intake based on body weight, activity level, and climate. Especially useful in hot and humid climates like Vietnam.
Calculate the mean, sum, minimum, and maximum of up to 10 numbers. Enter your values and specify how many to include in the calculation.
Calculate how much you save by switching to an electric vehicle (EV) in Vietnam. Compare annual fuel costs, payback period, and 5-year net savings versus a petrol car.
Calculate your ideal body weight using three established formulas: Devine, Robinson, and Hamwi. Results are averaged to give a balanced estimate based on your height and gender.
Calculate your target salary, negotiation anchor, and how your ask compares to market rate. Know your numbers before walking into any salary discussion.
Convert time between different UTC offsets. Enter the source time and select source and target UTC offsets to instantly see the converted time. Handles day boundary crossings.
Calculate how many years and months you have been married, and find out which anniversary year is next. Enter your wedding date and today's date to get the result. Western anniversary milestone names: 1=Paper, 5=Wood, 10=Tin/Aluminum, 15=Crystal, 20=China, 25=Silver, 30=Pearl, 40=Ruby, 50=Gold, 60=Diamond.
Plan your ancestor worship ceremony (giỗ / cúng) budget by entering costs for food offerings, incense and ritual items, flowers and fruit, guest meals, and the number of ceremonies per year. This tool helps you estimate the cost of a single ceremony and your total annual spending on ancestor worship traditions.
Convert your Vietnamese university score (10-point scale) to the international 4-point GPA scale. Vietnamese grading uses the following conversion table: 8.5–10 → 4.0 (A, Xuất sắc/Giỏi), 7.0–8.4 → 3.0 (B, Khá), 5.5–6.9 → 2.0 (C, Trung bình khá), 4.0–5.4 → 1.0 (D, Trung bình), 0–3.9 → 0.0 (F, Yếu/Kém). This calculator also shows the percentage equivalent of your score.
Estimate your pregnancy week and days remaining until your due date using Naegele's rule (LMP + 280 days). Adjusted for your menstrual cycle length.
Calculate sales tax in two modes: add tax to a pre-tax amount, or extract tax from a post-tax (tax-inclusive) amount. Useful for VAT and GST calculations.
Calculate your net take-home pay after Vietnamese social insurance (BHXH/BHYT/BHTN) and personal income tax (PIT) deductions. Based on 2024 VN tax brackets and the standard 10.5% employee contribution rate.
Estimate your annual personal income tax refund or amount owed after year-end finalization. Based on Vietnam's 7-bracket PIT system with personal and dependant deductions.
Estimate your Vietnamese university admission score (điểm xét tuyển) by combining three subject scores with priority points. Vietnam's university admission system adds area priority points (điểm ưu tiên khu vực): KV1 +0.75, KV2-NT +0.5, KV2 +0.25, KV3 +0. Group priority points (điểm ưu tiên đối tượng): UT1 +2.0, UT2 +1.0, UT3 +0. The final admission score equals the sum of three subject scores plus area and group priority points.
Project your retirement nest egg based on current savings, monthly contributions, expected annual return, and years until retirement. See if you are on track to hit your retirement goal.
Calculate your monthly contribution for Vietnamese voluntary social insurance (bảo hiểm xã hội tự nguyện). Contributors pay 22% of their chosen income base (mức thu nhập tự chọn). The state provides subsidies for eligible households: 30% for poor households, 25% for near-poor households, and 10% for others in difficult areas. The minimum income base is the regional minimum wage (~1,800,000 VND/month for rural areas) and the maximum is 20× the basic salary (46,800,000 VND/month in 2025).
Plan your Tết red envelope (lì xì / bao lì xì) budget by entering the number of recipients and amount per group. This tool helps you estimate the total cost of giving lì xì to children, elders, and other family members during Tết Nguyên Đán. Enter your planned amounts for each group to see the total budget needed.
Plan your wedding gift (mừng cưới) budget by entering the number of weddings and your planned gift amount for each relationship group. This tool helps you estimate the total cost of giving wedding gifts to close family, friends, and colleagues throughout the year. Enter your planned amounts for each group to see the total budget needed.
Plan your housewarming gift (mừng tân gia) budget by entering the number of events and your planned gift amount for each relationship group. This tool helps you estimate the total cost of cash gifts and physical gifts for close family, friends, and colleagues moving into a new home.
Plan your funeral condolence gift (phúng viếng) budget by entering the number of occasions and your planned contribution for each relationship group. This tool helps you estimate the total cost of condolence gifts for close family, friends, and colleagues. Enter your planned amounts for each group to see the total budget needed.
How your business compares to the industry average.
| Metric | Typical Range |
|---|---|
| Operating Margin | 10-15% |
| Net Profit Margin | 5-15% |
| Current Ratio | 1.5-2.0 |
| Revenue Growth | 10-20% |
Note: These are general industry estimates. Individual results may vary based on location and business model.
CalcVault provides accurate, easy-to-use financial tools that are accessible anywhere. Whether you're in the office or on the go, our calculators help you make informed decisions quickly.