The sums South Africans do every week: how many prepaid units your rands buy on your municipality's tariff, what a trip costs at this month's petrol price, and whether solar or gas pays off. Matric learners can work out their APS for every university that publishes its own rules, from Wits and UCT to Unisa. Percentages, currency, units, dates and health sit here too, along with the website traffic and earnings calculators.
All 72 everyday calculators and converters
- Prepaid electricity calculatorHow many prepaid electricity units (kWh) your rands buy, on City Power's 2026/27 block tariff from 1 July 2026, with the R241.50 fixed charge.
- Appliance running cost calculatorAppliance running cost calculator for South Africa: what a geyser, kettle, heater or fridge costs per hour, day, month and year - watts x hours x your rand price per kWh (City Power 2026/27 prepaid by default).
- Geyser electricity cost calculatorGeyser electricity cost calculator for South Africa: kWh and rands a day, month and year to heat your hot water, and what turning the thermostat down 5 degrees saves (City Power 2026/27 prepaid by default).
- Cape Town prepaid electricity calculatorCape Town prepaid electricity calculator: units your rands buy on the City's 2026/27 tariff from 1 July 2026 - Domestic (R2.46 a day, R4.14/kWh to 600 kWh), Lifeline (R2.83/kWh) and Home User.
- Eskom prepaid electricity calculatorEskom prepaid electricity calculator: units your rands buy from Eskom directly on the 2026/27 tariff from 1 April 2026 - Homelight 20A R2.70/kWh, Homelight 60A R3.44/kWh and Homepower with its daily charge.
- Durban prepaid electricity calculatoreThekwini (Durban) prepaid electricity calculator: units your rands buy on the 2026/27 tariff from 1 July 2026 - R4.11/kWh for every unit on Scale 8 and 9, no daily charge, and the Free Basic Scale 12.
- EV charging cost calculatorElectric car charging cost calculator for South Africa: what charging an EV at home costs a month on your electricity price (City Power R3.83/kWh default) and how it compares with petrol.
- Gas or electricity calculatorGas vs electricity cooking cost calculator for South Africa: LPG at your refill price against Eskom or council electricity per kWh, for the same heat - the cost a month, how long a 9 kg cylinder lasts and the break-even gas price.
- Solar payback calculatorSolar panel and inverter payback calculator for South Africa: how many years a system takes to pay for itself and the 10-year saving, with NERSA's 9.01% municipal tariff increase from 1 July 2026.
- Solar panels needed calculatorSolar panel calculator for South Africa: how many panels and what kWp system you need from the kWh on your bill, at 5 to 6 peak sun hours a day, with roof space and yearly output.
- Inverter and battery size calculatorInverter and battery size calculator for South Africa: the inverter kW and battery kWh and amp-hours you need to run your fridge, lights, TV and Wi-Fi through a power cut, lithium or lead-acid.
- Watts to amps calculatorWatts to amps calculator for South Africa: amps from watts and back on 230 V mains, 400 V three phase or 12, 24 and 48 V batteries - with kW, kVA and the breaker size.
- Fuel cost calculatorWhat a trip costs in petrol: distance, litres per 100 km and the pump price (95 inland R30.25 from 7 October 2026). Split it for a lift club.
- Fuel consumption calculatorFuel consumption calculator: your car's real litres per 100 km and km per litre from a fill-up, mpg, and the cost per km at the current petrol price (95 inland R30.25 from 7 October 2026).
- Fuel tax calculatorFuel tax calculator for South Africa 2026/27: how much of your petrol or diesel price is the general fuel levy, the Road Accident Fund levy and carbon tax - R6.58 a litre on petrol and R6.45 on diesel from 1 April 2026.
- Car running cost calculatorCar running cost calculator for South Africa: what your car costs a month and per kilometre - petrol at the current pump price, finance, insurance, services and licence.
- Car depreciation calculatorCar depreciation calculator for South Africa: what your car is worth after each year, the value lost a month, and the SARS wear-and-tear allowance over 5 years for business use.
- Currency converter calculatorRand currency converter: ZAR to US dollar, euro, pound and more on the latest European Central Bank reference rate, with your bank's margin.
- Unit converter calculatorUnit converter: km to miles, kg to pounds, litres to gallons, cups to ml - length, weight and volume, metric and imperial, on exact definitions.
- Percentage calculatorPercentage calculator: percent of a number, what percent one number is of another, percentage increase or decrease, and adding or taking off a percentage.
- Markup and profit margin calculatorMarkup and profit margin calculator in rands: selling price from a markup or margin, the markup and margin in a price, and the price incl. 15% VAT for VAT vendors.
- Discount calculatorDiscount calculator in rands: the sale price after a % off, how much % off a sale really is, and two discounts on top of each other.
- Split the bill and tip calculatorTip and bill splitting calculator in rands: the tip on a restaurant bill, what each person pays, and each share rounded up to the next R5 or R10.
- Age calculatorAge calculator: your exact age in years, months and days from your date of birth - in days and weeks too, the day you were born and the days to your next birthday.
- School starting age calculatorSchool starting age calculator for South Africa: the year your child can start Grade R and Grade 1 under the 30 June rule, when school becomes compulsory, their grade in any year and their matric year.
- ID number calculatorSouth African ID number checker: read the date of birth, age, sex and citizenship from a 13-digit ID number and test the Luhn check digit - nothing leaves your browser.
- Days between dates calculatorDays between dates calculator for South Africa: calendar days and working days between two dates, with weekends and South African public holidays (Public Holidays Act) left out.
- Pregnancy due date calculatorPregnancy due date calculator: your estimated due date 40 weeks (280 days) from the first day of your last period, adjusted for your cycle, how many weeks pregnant you are and your trimester.
- Ovulation calculatorOvulation calculator: your likely ovulation date and most fertile days from the first day of your last period and your cycle length, with the NHS 10 to 16 day range and the next cycles.
- BMI calculatorBMI calculator in kilograms and centimetres: your body mass index, the WHO category and the healthy weight range for your height.
- Calories a day calculatorCalorie calculator: how many calories and kilojoules you burn a day to keep your weight steady - Mifflin-St Jeor resting rate times your FAO/WHO activity level.
- Running pace calculatorRunning pace calculator: minutes per kilometre and km/h from your distance and time, and your parkrun, 10 km, half marathon and marathon times at that pace.
- APS score calculatorWork out your APS (Admission Point Score) for South African universities from your NSC levels - best six subjects, Life Orientation excluded.
- Wits APS calculatorWits APS calculator: your Admission Point Score the way Wits University counts it - best seven subjects with Life Orientation, 8 points for 90%+, and 2 bonus points for English and Maths from 60%. Out of 56.
- UCT FPS calculatorUCT FPS calculator: your University of Cape Town Faculty Points Score for 2027 - out of 600 for Commerce, Engineering, Humanities and Law, 800 for Science (Maths and Physical Sciences doubled) and 900 for Health Sciences with NBTs.
- Stellenbosch score calculatorStellenbosch APS calculator: your Stellenbosch University average of the six best subjects (no Life Orientation) and the 2027 BEng selection score out of 800 - Maths + Physical Sciences + 6 x average - with the engineering minimums.
- UKZN APS calculatorUKZN APS calculator: your Admission Point Score the way the University of KwaZulu-Natal counts it - six NSC subjects without Life Orientation on the UKZN 1-8 points table, 8 for 90% or more. Out of 48.
- UJ APS calculatorUJ APS calculator: your Admission Point Score the way the University of Johannesburg counts it - the NSC rating (7 for 80% or more) of six subjects, Life Orientation left out. Out of 42, with your programme minimum.
- UP APS calculatorUP APS calculator: your Admission Point Score the way the University of Pretoria (Tuks) counts it - six NSC 20-credit subjects on the 7-point scale, Life Orientation excluded. Out of 42, with your programme minimum.
- NWU APS calculatorNWU APS calculator: your Admission Point Score the way North-West University counts it - your six best NSC subjects without Life Orientation, 8 points for 90% or more. Out of 48.
- TUT APS calculatorTUT APS calculator: your Admission Point Score the way Tshwane University of Technology counts it - six NSC subjects, Life Orientation and any level 1 (under 30%) left out. Out of 42, with your programme minimum.
- UFS AP score calculatorUFS AP score calculator: your Admission Point score the way the University of the Free State counts it - six NSC subjects with 8 points for 90% or more, plus 1 point for Life Orientation at 60%. Out of 49.
- Rhodes APS calculatorRhodes APS calculator: your Admission Point Score the way Rhodes University counts it - six NSC subjects including English, each mark divided by ten, nothing under 40%. Out of 60, with the 45-point automatic acceptance line.
- UL APS calculatorUL APS calculator: your Admission Point Score the way the University of Limpopo counts it - six NSC subjects on the 7-point scale, Life Orientation left out. Out of 42, with your programme minimum.
- CUT APS calculatorCUT APS calculator: your admission points the way Central University of Technology counts them - six NSC subjects with 8 points for 90% or more, plus 1 point for Life Orientation. Out of 49; 27 is the minimum.
- NMU Applicant Score calculatorNMU APS calculator: your Applicant Score (AS) the way Nelson Mandela University counts it - six NSC subject percentages added, out of 600, plus 7 points for Life Orientation at a quintile 1 to 3 school.
- UWC points calculatorUWC APS calculator: your points the way the University of the Western Cape counts them - English and Maths up to 15, other subjects up to 8, Life Orientation up to 3, out of 65.
- Univen APS calculatorUniven APS calculator: your Admission Point Score the way the University of Venda counts it for 2027 - each NSC mark divided by ten, nothing under 40%, up to seven subjects, Life Orientation left out. Degree minimum 26.
- MUT APS calculatorMUT APS calculator: your admission points the way Mangosuthu University of Technology counts them - best six NSC subjects, 8 points for 90%, no points under 40%, Life Orientation left out. Minimum 25.
- UFH APS calculatorUFH APS calculator: your Admission Point Score the way the University of Fort Hare counts it - six NSC subjects on the 7-point scale plus Life Orientation capped at level 4. Out of 46, with your degree minimum.
- WSU APS calculatorWSU APS calculator: your Admission Point Score the way Walter Sisulu University counts it - two languages plus your best four other NSC subjects, 8 points for 90%, Life Orientation only for BEd Foundation Phase. Out of 48.
- UNIZULU APS calculatorUNIZULU APS calculator: your Admission Point Score the way the University of Zululand counts it - six NSC subjects, 8 points for 90%, Life Orientation left out. Out of 48, with your programme minimum.
- VUT APS calculatorVUT APS calculator: your Admission Point Score the way Vaal University of Technology counts it - up to six NSC subjects, 8 points for 90%, Life Orientation left out. Out of 48, with the programme minimum.
- Unisa APS calculatorUnisa APS calculator: your Admission Point Score from six 20-credit NSC subjects on the 1 to 7 scale, Life Orientation left out - out of 42, against your qualification's minimum.
- NSFAS eligibility calculatorNSFAS calculator: check whether your combined household income qualifies for an NSFAS bursary (R350 000, or R600 000 with a disability) or the NSFAS loan (R350 000 to R600 000), on the 2026 guidelines. SASSA recipients qualify automatically.
- Matric pass level calculatorMatric pass calculator for South Africa: whether your NSC marks give you a bachelor's, diploma or higher certificate pass under the Department of Basic Education rules - 40%, 50% and 30% subjects, Life Orientation and your APS.
- Exam mark needed calculatorExam mark calculator: the final exam mark you need for the % you want, from your SBA or year mark - Grade 12 25% SBA and 75% exam, Grade 10-11 40/60 (DBE 2023).
- Test mark percentage calculatorTest mark percentage calculator: your mark out of the total as a percentage, and the NSC achievement level (1 to 7) and APS points it gives - with the marks needed for the next level.
- Break-even calculatorBreak-even calculator for small businesses: how many units and how much turnover a month cover your fixed costs, the contribution margin, and the sales needed for a target profit.
- Page views to $100 a month calculatorHow many page views a month your website needs to earn $100 from display ads at your page RPM, the page views a day, and how many months until your traffic gets there - with typical RPM by niche.
- Visitors for $1 000 a month calculatorHow many visitors a month your website needs to earn $1 000 from display ads, by niche - finance, tech, travel, food, lifestyle, gaming - with sourced RPM estimates, the page views behind it and when your traffic gets there.
- Months to 10 000 visitors calculatorHow many months until your website gets 10 000 visitors a month, from your visits today, your monthly growth rate and how many posts you publish - with a chart of your traffic over time and sourced benchmarks.
- Value of a returning visitor calculatorWhat a returning visitor is worth to your website against a new one, from the visits and returning visitors on your web counter, pages per visit and ad RPM - with what a higher returning share adds over 12 months and sourced benchmarks.
- Cost of bounce rate calculatorWhat your bounce rate costs your website in page views and ad earnings, from the visits on your web counter, pages per visit and ad RPM - with 12 months of earnings at your bounce rate against a lower target and sourced benchmarks.
- Cost of slow page load calculatorWhat a slow page load costs your website in earnings, from the visits and pages per visit on your web counter, ad RPM and your load time - with 12 months of earnings at each load time and sourced benchmarks.
- Posts until Google traffic calculatorHow many blog posts and how many months until a new website gets real traffic from Google, from the posts you publish, the share that rank and how long they take - with a chart of search visits over time and sourced benchmarks.
- Email list vs search traffic calculatorIs an email subscriber worth more than a visitor from Google? What one subscriber is worth in search visits, and what your email list and your search traffic each earn over 24 months - with a chart and sourced benchmarks.
- Ads vs affiliate vs own product calculatorWhich earns your website more: display ads, affiliate links or a product of your own? Revenue per 1 000 visitors and per month for each, over 24 months with traffic growth - with a chart and sourced benchmarks.
- Hosting break-even calculatorWhen will your website pay for its own hosting? The month your ad and affiliate earnings pass your hosting and tools cost, from your visits, monthly growth and earnings per 1 000 visits - in rand or dollars, with a chart and sourced benchmarks.
- Traffic to replace a salary calculatorHow much website traffic do you need to replace your salary? The visits a month and a day your site needs to pay you a rand salary plus its running costs, and how many months until your traffic gets there - with a chart and sourced benchmarks.
- What one blog post is worth calculatorWhat is one blog post worth? The visits and earnings a single post brings over its life - ramping up while it ranks, then fading - and whether it pays back what it cost to write, with a chart and sourced benchmarks.
- Cost of a seasonal traffic dip calculatorWhat does the December dip cost your website? The visits and earnings a seasonal traffic drop takes a year, the extra traffic it takes to make up, and why the bounce-back is not real growth - with a chart of the year.
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