Our calculators solve cycling problems using shared google sheets or openasapp.net. There is no charge but consider a donation or ask for a private copy.


Most are open access but some require “edit” permission in the top left of the sheet.


Openasapp.net sheets work from a browser or from a mobile.



Body composition vs power http://bit.ly/caheight Very rough calculation of effect of body size on CDA and power
Chain wear calculator http://fft.tips/chain Predicts when your chain will wear out and need changing
Change my bar width http://bit.ly/cawbars Shows the effect of handlebar width on steering (for cyclingapps.net)
Climbing critical power http://fft.tips/climb Works out how hard you should go up climbs
Crank length change tool http://bit.ly/cawcranks Shows the effect of changing crank size (for cyclingapps.net)
CTL Ramp rate calculator http://fft.tips/CTL Works out how to change power or TSS based on CTL (aka fitness) ramp rates
Drafting savings calculator http://fft.tips/draft Works out the benefit of drafting in paceline, track or bunch
Drivetrain efficiency savings http://fft.tips/drivetrain Shows the efficiency savings of your drivetrain (eg 1x, big ring)
FastestTyreSolver http://fft.tips/tyre Finds the fastest tyre based on prediction of aero and rolling losses
FTP 20m=>60m Predictor http://fft.tips/ftp A better model for finding 60min best power from 20min power
Fueling and Pacing calculator http://fft.tips/bonk A clever calculator to work out your power and fueling over a long ride
Hub engagement quick calculator https://goo.gl/VjyM2X A quick calculator of hub engagement time
OSPW marginal gains http://fft.tips/ospw A way to show the pros and cons of installing an aftermarket OSPW
Pursuit 4000m calculator http://fft.tips/pursuit Compare yourself against Filippo Ganna in his 4000m WR
Power zones calculator http://bit.ly/cawzones Power zones in a really quick slider (made for cyclingapps.net)
Slam stem and bar savings http://fft.tips/stem Works out savings from stem and bar position on watts and time
Training periodization planner http://fft.tips/tpp Shows how to periodize your training all year around
Pro Training periodization planner http://fft.tips/tpp3 Shows how to periodize your training all year around
Training time-in-zone http://fft.tips/tiz Shows how training models effect your time in zone
Treadmill energy calculator http://fft.tips/treadmill This is how much energy it costs to run on various treadmill grades
Tyre by surface http://fft.tips/surface Finds the perfect tyre for any riding surface (pressure too!)
Tyre pressure solver http://fft.tips/pressure Find the optimal tyre pressure depending on weight and size
V02Max calculator bit.ly/myvo2max A little v02max to watts to run time calculator (for cyclingapps.net)
Velodrome Calculator https://goo.gl/7Jcv43 A handy little velodrome worksheet
Wind Pacing http://fft.tips/wind How to pace a race (out&back) or loop according to wind strength
Zwift Predictor http://bit.ly/zwiftpredictor Converts bike/tyre/course into zwift predicted finish time (for cyclingapps.net)
500 Climbing bikes http://goo.gl/clEWGl A sheet of 500 climbing bikes
Deep Carbon Wheels http://bit.ly/fftcarbon A list of all carbon disc brake wheels
Disc brake bike finder http://bit.ly/cawdiscwheel A sheet of many disc brake bikes
Groupsets 2020 chart http://fft.tips/cgroupsets A bubble chart of groupsets
Helmets 2022 chart http://fft.tips/chelmets A bubble chart of helmets
History of cycling https://goo.gl/cGYT6K History of cycling by major results (for cyclingapps.net)
Road bike Finder https://goo.gl/HsGbAZ A list of road bikes up to 2019
Superbikes 2020 chart http://fft.tips/superbikes A bubble chart of superbikes
Altitude predictor email us Effect of altitude on power vs V02 max vs speed
Climb finder email us All the big climbs in the world in one big spreadsheet!
Virtual wind tunnel email us Calculator CDA or speed or power from common variables
Universal marginal gain calculator email us Works out the time saving of the top 100 marginal gain options
Detraining & deconditioning predictor email us Works out your FTP after having time off the bike
Drafting team pursuit track strategy email us Works out draft savings on the track, and a rotational strategy
Rank me as a cyclist http://fft.tips/rankme Ranks your w/kg and watts against realistic targets
Interval difficulty calc http://fft.tips/difficulty Calculates the difficulty of an interval series accurately