Lunia · Free tools
Free tools for your cycle and training.
Plan a walk, compare a pace or understand your cycle dates. Useful tools that run in your browser, without an account.
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Cycle & fertility7
- Cycle Phase CalculatorWhich phase you are in today
- Ovulation CalculatorYour estimated fertile days
- Period CalculatorWhen your next few periods land
- Menstrual Cycle Length CalculatorMeasure a completed cycle from two consecutive period start dates.
- Luteal Phase CalculatorCount the interval between an estimated ovulation date and the next period.
- Pregnancy Test CalculatorFind a testing date using the NHS 21-day guidance when your next period is unknown.
- Pregnancy Due Date CalculatorEstimate a due date from the first day of the last period and regular cycle length.
Steps & walking12
- Step Distance CalculatorTurn a step count into kilometres or miles, or convert a distance back to steps.
- Steps to Calories CalculatorEstimate walking energy from your steps, height, body weight and pace.
- Walking Calories CalculatorCompare gross and active walking energy using either time or distance.
- Treadmill Calorie CalculatorEstimate treadmill energy from speed, incline, duration and body weight.
- Treadmill Incline CalculatorCompare an uphill treadmill effort with an oxygen-cost equivalent flat pace.
- Rucking Calorie CalculatorEstimate the energy cost of walking with a loaded pack.
- Steps Per Mile CalculatorFind a height-based estimate of steps in one mile or kilometre.
- Walking Time CalculatorPlan how long a walk could take at your chosen speed.
- Daily Step Goal CalculatorBuild a manageable next step goal from your current daily average.
- Weight Loss Walking CalculatorSee how much walking corresponds to an active-energy comparison target.
- Distance Equivalent CalculatorConvert kilometres, miles, metres and yards with a walking-time reference.
- Activity to Steps ConverterCompare another activity with the active energy of moderate walking.
Running & training11
- One-Rep Max CalculatorEstimate your 1RM from any set
- Heart Rate Zones CalculatorYour five training zones
- Running Pace CalculatorCalculate pace and speed from a run, then compare a target distance.
- Marathon Race PredictorCompare predicted 5K, 10K, half-marathon and marathon finish times.
- Race Time PredictorFind your average race pace and a finish-time projection for another distance.
- Training Pace ZonesExplore five starting pace bands from a recent race result.
- Pace to Speed ConverterConvert min/km, min/mile, km/h and mph in both directions.
- Resting Heart Rate CalculatorUse resting and maximum heart rates to calculate heart-rate reserve bands.
- VO₂ Max CalculatorEstimate aerobic capacity with a heart-rate ratio or a 12-minute field test.
- GPX ViewerOpen a GPX route, explore its shape and inspect distance, elevation and timing.
- Workout Stats GeneratorCreate a transparent PNG overlay for a Strava run or any workout photo.
Energy & body measurements12
- Protein CalculatorA sensible daily protein target
- BMI CalculatorCalculate adult BMI and understand the screening category.
- Body Fat CalculatorEstimate body fat from height and tape measurements using a circumference model.
- BMR CalculatorCompare three common resting-energy equations.
- TDEE CalculatorEstimate daily maintenance energy from resting needs and an activity multiplier.
- Macro CalculatorSplit an energy budget into protein, fat and carbohydrate.
- Calorie Deficit CalculatorCompare estimated maintenance energy with a modest chosen energy difference.
- Weight Loss CalculatorCompare a goal-weight change with a simple energy-equivalent timeline.
- Water Intake CalculatorExplore a rough weight-based fluid range and put exercise needs in context.
- Calories Burned CalculatorCompare approximate energy across more than 50 activities.
- Ideal Weight CalculatorCompare historical reference formulas with the adult BMI reference range.
- Waist-to-Hip Ratio CalculatorCalculate the ratio between waist and hip circumference.